Publications and Presentations

Articles (refereed)

  1. Longitudinal dependence of eastward and westward magnetic variations at mid-latitudes,
       S. Nakano and T. Iyemori,
       Adv. Polar Upper Atmos. Res., v. 15, pp. 128-134, 2001.
  2. Local time features of geomagnetic jerks,
       H. Nagao, T. Iyemori, T. Higuchi, S. Nakano, and T. Araki,
       Earth Planets Space, v. 54, pp. 119-131, 2002.
  3. Net field-aligned currents controlled by the polar ionospheric conductivity,
       S. Nakano, T. Iyemori, and S. Yamashita,
       J. Geophys. Res., v. 107 (A5), doi:10.1029/2001JA900177, 2002.
  4. Antisunward net Birkeland current system deduced from the Oersted satellite observation,
       S. Yamashita, T. Iyemori, S. Nakano, T. Kamei, and T. Araki,
       J. Geophys. Res., v. 107 (A9), doi:10.1029/2001JA900160, 2002.
  5. Local time distribution of net field-aligned currents derived from high-altitude satellite data,
       S. Nakano and T. Iyemori,
       J. Geophys. Res., v. 108 (A8), 1314, doi:10.1029/2002JA009519, 2003.
  6. Solar activity dependence of two types of east-west geomagnetic disturbances at mid latitudes,
       S. Nakano,
       Adv. Polar Upper Atmos. Res., v. 18, pp. 23-34, 2004.
  7. Storm-time field-aligned currents on the nightside inferred from ground-based magnetic data at midlatitudes: Relationships with the interplanetary magnetic field and substorms,
       S. Nakano and T. Iyemori,
       J. Geophys. Res., v. 110, A07216, doi:10.1029/2004JA010737, 2005.
  8. Merging particle filter for sequential data assimilation,
       S. Nakano, G. Ueno, and T. Higuchi,
       Nonlin. Processes Geophys., v. 14, pp. 395-408, 2007.
  9. A method for estimating the ring current structure and the electric potential distribution using ENA data assimilation,
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       J. Geophys. Res., v. 113, A05208, doi:10.1029/2006JA011853, 2008.
  10. ENA Occultation: New remote sensing technique to study the lunar exosphere,
       Y. Futaana, S. Nakano, M. Wieser, and S. Barabash,
       J. Geophys. Res., V. 113, A11204, doi:10.1029/2008JA013356, 2008.
  11. The merging particle filter and its characteristics,
       S. Nakano, G. Ueno, K. Nakamura, and T. Higuchi,
       Proceedings of the Institute of Statistical Mathematics, v. 56, pp. 225-234, 2008 (in Japanese).
  12. Impact of the solar-wind dynamic pressure on the Region-2 field-aligned currents,
       S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
       J. Geophys. Res., V. 114, A02221, doi:10.1029/2008JA013674, 2009.
  13. Estimation of a long-term variation of a magnetic- storm index using the merging particle filter,
       S. Nakano and T. Higuchi,
       IEICE Trans. Inf. Syst., v. E92-D, pp. 1382-1387, 2009.
  14. Non-storm irregular variation of the Dst index,
       S. Nakano and T. Higuchi,
       Ann. Geophys., v. 30, pp. 153-162, 2012.
  15. Hybrid algorithm of ensemble transform and importance sampling for assimilation of non-Gaussian observations,
       S. Nakano,
       Tellus A, v. 66, 21429, doi:10.3402/tellusa.v66.21429, 2014.
  16. Estimation of the helium ion density distribution in the plasmasphere based on a single IMAGE/EUV image,
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       J. Geophys. Res., v. 119, pp. 3724-3740, doi:10.1002/2013JA019733, 2014.
  17. Estimation of temporal evolution of the helium plasmasphere based on a sequence of IMAGE/EUV images,
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       J. Geophys. Res., v. 119, pp. 3708-3723, doi:10.1002/2013JA019734, 2014.

Proceedings (refereed)

  1. "Population-based quasi-Bayesian algorithm for high-dimensional sequential problems and hierarchization of it for distributed computing environments",
       S. Nakano,
       Proceedings of 2010 IEEE Congress on Evolutionary Computation (CEC), doi:10.1109/CEC.2010.5586535, 2010.
  2. "A dynamic grouping strategy for implementation of the particle filter on a massively parallel computer",
       S. Nakano and T. Higuchi,
       Proceedings of 13th International Conference on Information Fusion, 2010.
  3. "Fault parameter estimation with data assimilation on infrasound variations due to big earthquakes",
       H. Nagao, N. Kobayashi, S. Nakano and T. Higuchi,
       Proceedings of 14th International Conference on Information Fusion, 2011.
  4. "Weight adjustment of the particle filter on distributed computing systems",
       S. Nakano and T. Higuchi,
       Proceedings of 15th International Conference on Information Fusion, pp. 2480-2485, 2012.
  5. "A prediction algorithm with a limited number of particles for state estimation of high-dimensional systems",
       S. Nakano,
       Proceedings of 16th International Conference on Information Fusion, pp. 1356-1363, 2013.

Conferences (international)

  1. "Local-time distribution of net field-aligned currents derived from high-altitude satellite data",
       S. Nakano and T. Iyemori,
       EGS-AGU-EUG Joint Assembly 2003, Nice, France, Apr. 2003. (poster)
       (Geophys. Res. Abstr., 5, 03079.)
  2. "Effects of the interplanetary magnetic field and substorms on nightside upward field-aligned currents during storm-time inferred from geomagnetic data at mid-latitudes",
       S. Nakano and T. Iyemori,
       AGU 2003 Fall Meeting, San Francisco, USA, Dec. 2003. (poster)
       (EOS Trans. AGU, 84(46), Fall Meet. Suppl., Abstract SM32A-1146.)
  3. "Estimation of global distribution of large-scale field-aligned currents on the basis of ground-based magnetic data at mid-latitudes and in the polar-cap",
       S. Nakano and T. Iyemori,
       AGU 2004 Fall Meeting, San Francisco, USA, Dec. 2004. (poster)
       (EOS Trans. AGU, 85(47), Fall Meet. Suppl., Abstract SM53A-0398.)
  4. "Long-term variations in nightside geomagnetic disturbances at mid-latitudes",
       S. Nakano and T. Iyemori,
       Xth IAGA Scientific Assembly, Toulouse, France, Jul. 2005. (poster)
  5. "Variations of field-aligned currents on the nightside inferred from mid-latitude ground-based geomagnetic data: Relationships with the IMF and substorms",
       S. Nakano and T. Iyemori,
       Xth IAGA Scientific Assembly, Toulouse, France, Jul. 2005. (talk)
  6. "A Data Assimilation Model of the Storm-time Ring Current",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C:son Brandt, and T. Higuchi,
       AGU 2005 Fall Meeting, San Francisco, USA, Dec. 2005. (poster)
       (EOS Trans. AGU, 86(52), Fall Meet. Suppl., Abstract SM13A-0330.)
  7. "Application of the particle filter technique to magnetospheric physics",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       EGU General Assembly 2006, Vienna, Austria, Apr. 2006. (poster)
       (Geophys. Res. Abstr., 8, 05449.)
  8. "Use of data assimilation to estimate physical parameters in a ring current model",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       EGU General Assembly 2006, Vienna, Austria, Apr. 2006. (poster)
       (Geophys. Res. Abstr., 8, 05372.)
  9. "Estimation of the ring current structure through data assimilation of global ENA data into a ring current model",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       The 2006 Joint Assembly of AGU and so on, Baltimore, USA, May. 2006. (poster)
       (EOS Trans. AGU, 87(36), Jt. Assem. Suppl., Abstract SM43B-05.)
  10. "Data assimilation of global ENA data into a kinetic ring current model",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       GEM 2006 Summer Workshop, Snowmass, USA, Jun. 2006. (poster)
  11. "Structure of the ring current and electric potential in the inner magnetosphere deduced from ENA data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       AGU 2006 Fall Meeting, San Francisco, USA, Dec. 2006. (talk)
       (EOS Trans. AGU, 87(52), Fall Meet. Suppl., Abstract SM14B-03.)
  12. "A particle filter with merging procedure for sequential data assimilation",
       S. Nakano, G. Ueno, and T. Higuchi,
       EGU General Assembly 2007, Vienna, Austria, Apr. 2007. (talk)
       (Geophys. Res. Abstr., 9, 03147.)
  13. "Quantitative modeling of the ring current using ENA data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       XXIVth IUGG General Assembly, Perugia, Italy, Jul. 2007. (talk)
  14. "Ring current modeling with an algorithm based on the particle filter/smoother",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       XXIVth IUGG General Assembly, Perugia, Italy, Jul. 2007. (talk)
  15. "Data assimilation for modeling the ring current evolution",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       SCOSTEP CAWSES International Symposium, Kyoto, Japan, Oct. 2007. (poster)
  16. "Variations in the ring current and inner-magnetospheric electric field deduced from data assimilation of IMAGE/HENA data",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       AGU 2007 Fall Meeting, San Francisco, USA, Dec. 2007. (talk)
       (Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract SM43E-07.)
  17. "Parameter estimation for dynamic nonlinear models using the merging particle filter",
       S. Nakano, G. Ueno, and T. Higuchi,
       EGU General Assembly 2008, Vienna, Austria, Apr. 2008. (poster)
       (Geophys. Res. Abstr., 10, EGU2008-A-08008.)
  18. "Data assimilation of energetic neutral atom data for two-dimensional modeling of the magnetospheric ring current",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       EGU General Assembly 2008, Vienna, Austria, Apr. 2008. (talk)
       (Geophys. Res. Abstr., 10, EGU2008-A-04916.)
  19. "A feasibility study of ring current modeling using data assimilation of multi-satellite observations",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, and T. Higuchi,
       AOGS 5th Annual General Meeting, Busan, the Republic of Korea, Jun. 2008. (poster)
  20. "Estimation of an uncertain parameter in dynamic nonlinear models using ensemble-based data assimilation schemes",
       S. Nakano, G. Ueno, and T. Higuchi,
       AOGS 5th Annual General Meeting, Busan, the Republic of Korea, Jun. 2008. (talk)
  21. "Data assimilation approach and its applications to the modeling of the dynamics in the magnetosphere",
       S. Nakano,
       International Symposium: Fifty Years after IGY - Modern Information Technologies and Earth and Solar Sciences -, Tsukuba, Japan, Nov. 2008. (poster)
  22. "Effects of the solar-wind dynamic pressure on the Region-2 field-aligned current intensity",
       S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
       AGU 2008 Fall Meeting, San Francisco, USA, Dec. 2008. (poster)
       (Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract SM53A-1656.)
  23. "Implementation of the particle filter and the merging particle filter in parallel computing systems",
       S. Nakano, G. Ueno, K. Nakamura, and T. Higuchi,
       EGU General Assembly 2009, Vienna, Austria, Apr. 2009. (poster)
       (Geophys. Res. Abstr., 11, EGU2009-6819-1.)
  24. "Statistical analysis of influence of the solar-wind pressure enhancement on the Region-2 field-aligned currents",
       S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
       XIth IAGA Scientific Assembly, Sopron, Hungary, Aug. 2009. (talk)
  25. "Development of an EUV data assimilation technique for plasmasphere modeling",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       XIth IAGA Scientific Assembly, Sopron, Hungary, Aug. 2009. (poster)
  26. "Merging particle filter for high-dimensional nonlinear problems",
       S. Nakano, G. Ueno, and T. Higuchi,
       The 5th WMO symposium on data assimilation, Melbourne, Australia, Oct. 2009. (poster) [Extended abstract]
  27. "A data assimilation method for plasmasphere modeling using EUV imaging data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       AGU 2009 Fall Meeting, San Francisco, USA, Dec. 2009. (poster)
       (Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract SM51A-1323.)
  28. "Population-based quasi-Bayesian algorithm for high-dimensional sequential problems and hierarchization of it for distributed computing environments",
       S. Nakano,
       2010 IEEE World Congress on Computational Intelligence, Barcelona, Spain, Jul. 2010. (talk)
       (Proceedings of 2010 IEEE Congress on Evolutionary Computation (CEC), doi:10.1109/CEC.2010.5586535.)
  29. "A dynamic grouping strategy for implementation of the particle filter on a massively parallel computer",
       S. Nakano and T. Higuchi,
       13th International Conference on Information Fusion, Edinburgh, UK, Jul. 2010. (talk)
  30. "An EUV data assimilation technique for the modeling of the plasmasphere using the particle filter",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       2010 Asia-Pacific Radio Science Conference, Toyama, Japan, Sep. 2010. (poster)
  31. "Massively parallel particle filter and a grouping strategy",
       S. Nakano and T. Higuchi,
       XXVth IUGG General Assembly, Melbourne, Australia, Jul. 2011. (poster)
  32. "Data assimilation of EUV imaging data into a plasmasphere model",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       XXVth IUGG General Assembly, Melbourne, Australia, Jul. 2011. (talk)
  33. "Anti-correlation between the quiet-time level of mid-latitude magnetic field and long-term solar-wind activity",
       S. Nakano, H. Nagao, and T. Higuchi,
       XXVth IUGG General Assembly, Melbourne, Australia, Jul. 2011. (talk)
  34. "An approach for exploring the dynamics of the plasmasphere using data assimilation of IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       AGU 2011 Fall Meeting, San Francisco, USA, Dec. 2011. (poster)
       (Eos Trans. AGU, 92, Fall Meet. Suppl., Abstract SM33A-2145.)
  35. "Data assimilation of IMAGE/EUV data for estimating the plasmaspheric structure",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Inner Magnetosphere Coupling II Conference, Los Angeles, USA, Mar. 2012. (poster)
  36. "Estimation of the ring current structure with data assimilation based on the particle filter",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       Inner Magnetosphere Coupling II Conference, Los Angeles, USA, Mar. 2012. (invited talk)
  37. "Estimation of the long-term component of the variation in geomagnetic data",
       S. Nakano and T. Higuchi,
       EGU General Assembly 2012, Vienna, Austria, Apr. 2012. (poster)
       (Geophys. Res. Abstr., 14, EGU2012-10726.)
  38. "Applicability of the particle filter for high-dimensional problems using a massively parallel computer",
       S. Nakano and T. Higuchi,
       EGU General Assembly 2012, Vienna, Austria, Apr. 2012. (poster)
       (Geophys. Res. Abstr., 14, EGU2012-9181.)
  39. "Weight adjustment of the particle filter on distributed computing systems",
       S. Nakano and T. Higuchi,
       15th International Conference on Information Fusion, Singapore, Jul. 2012. (talk)
  40. "Hybrid approach of ensemble transform and importance sampling for nonlinear data assimilation",
       S. Nakano and G. Ueno,
       International Conference on Ensemble Methods in Geophysical Sciences, Toulouse, France, Nov. 2012. (talk)
  41. "Particle filter with a proposal distribution generated by the ensemble transform Kalman filter",
       S. Nakano and G. Ueno,
       AGU 2012 Fall Meeting, San Francisco, USA, Dec. 2012. (poster)
       (Eos Trans. AGU, 93, Fall Meet. Suppl., Abstract NG43A-1568.)
  42. "Comparison of two ways for representation of the forecast probability density function in ensemble-based sequential data assimilation",
       S. Nakano,
       EGU General Assembly 2013, Vienna, Austria, Apr. 2013. (talk)
       (Geophys. Res. Abstr., 15, EGU2013-7029-1.)
  43. "A prediction algorithm with a limited number of particles for state estimation of high-dimensional systems",
       S. Nakano,
       16th International Conference on Information Fusion, Istanbul, Turkey, Jul. 2013. (talk)
  44. "Global distribution of the plasmaspheric ions and electric potential estimated with data assimilation of the IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       XIIth IAGA Scientific Assembly, Merida, Mexico, Aug. 2013. (talk)
  45. "A data-driven Monte Carlo simulation model of typhoon tracks",
       S. Nakano, K. Suzuki, and G. Ueno,
       JSST 2013 International Conference of Simulation Technology, Tokyo, Japan, Sep. 2013. (talk)
  46. "Estimation of the plasmaspheric helium ion distribution through assimilation of the IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       AGU 2013 Fall Meeting, San Francisco, USA, Dec. 2013. (invited talk)
  47. "Application of data assimilation approach to space physics",
       S. Nakano,
       The 23rd South Taiwan Statistics Conference and 2014 Chinese Institute of Probability and Statistics Annual Meeting, Hualien, Taiwan, Jun. 2014. (talk)
  48. "Temporal evolution of helium ion density distribution estimated by assimilation of IMAGE/EUV data into a plasmasphere model",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       AOGS 11th Annual Meeting, Sapporo, Japan, Jul. 2014. (poster)
  49. "An empirical Monte Carlo modeling of typhoon trajectories",
       S. Nakano, K. Suzuki, and G. Ueno,
       AOGS 11th Annual Meeting, Sapporo, Japan, Jul. 2014. (poster)
  50. "Modeling of typhoon trajectory patterns using the Gaussian process regression",
       S. Nakano, K. Suzuki, and G. Ueno,
       Data analysis and modeling in Earth sciences 2014, Milan, Italy, Oct. 2014. (talk)
  51. "Optimization of the smoothness parameters in the Gaussian regression analysis for the modeling of typhoon trajectories",
       S. Nakano, K. Suzuki, and G. Ueno,
       Data analysis and modeling in Earth sciences 2014, Milan, Italy, Oct. 2014. (poster)

Conferences (domestic)

  1. "Baseline estimations of QL Dst index observatories",
       S. Nakano, T. Kamei, and M. Sugiura,
       The 106th SGEPSS Fall Meeting, Sendai, Nov. 1999. (poster)
  2. "Magnetic Effects of the Field-Aligned Current on the Ground in middle latitudes",
       S. Nakano and T. Iyemori,
    2000 Japan Earth and Planetary Science Joint Meeting, Tokyo, Jun. 2000. (poster)
  3. "A longitudinal dependence of the eastward or westward magnetic variations at mid-latitudes",
       S. Nakano and T. Iyemori,
       The 24th Symposium on Coordinated Observations of the Ionosphere and the Magnetosphere in the Polar Regions, Tokyo, Aug. 2000. (talk)
  4. "Eastward magnetic variations at mid-latitudes on the nightside",
       S. Nakano, T. Iyemori, and S. Yamashita,
       The 108th SGEPSS Fall Meeting, Tokyo, Nov. 2000. (talk)
  5. "A longitudinal dependence of eastward magnetic disturbances at mid-latitudes on the nightside",
       S. Nakano and T. Iyemori,
    2001 Japan Earth and Planetary Science Joint Meeting, Tokyo, Jun. 2001. (talk)
  6. "An estimation of current distribution in the inner magnetosphere",
       S. Nakano and T. Iyemori,
    110th SGEPSS Fall Meeting, Fukuoka, Nov. 2001. (poster)
  7. "Field-aligned current distribution and geomagnetic disturbances",
       S. Nakano, T. Iyemori, S. Yamashita,
    2002 Japan Earth and Planetary Science Joint Meeting, Tokyo, May. 2002. (talk)
  8. "An estimation of current distribution in the inner magnetosphere II",
       S. Nakano and T. Iyemori,
    2002 Japan Earth and Planetary Science Joint Meeting, Tokyo, May. 2002. (poster)
  9. "Anti-sunward current system derived from high-altitude observation",
       S. Nakano and T. Iyemori,
    The 26th Symposium on Coordinated Observations of the Ionosphere and the Magnetosphere in the Polar Regions, Tokyo, Jul. 2002. (talk)
  10. "Some characteristics of east-west geomagnetic disturbances at mid-latitudes on the nightside",
       S. Nakano and T. Iyemori,
    112th SGEPSS Fall Meeting, Chofu, Nov. 2002. (poster)
  11. "East-west geomagnetic disturbances at mid-latitudes during geomagnetic storms and their relation with the convection electric field",
       S. Nakano and T. Iyemori,
    2003 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2003. (talk)
  12. "Characteristics of upward field-aligned currents on the nightside",
       S. Nakano and T. Iyemori,
    The 27th Symposium on Coordinated Observations of the Ionosphere and the Magnetosphere in the Polar Regions, Tokyo, Aug. 2003. (talk)
  13. "Possible substorm effects on upward field-aligned currents on the nightside inferred from geomagnetic data at mid-latitudes",
       S. Nakano and T. Iyemori,
    114th SGEPSS Fall Meeting, Toyama, Oct. 2003. (talk)
  14. "Another approach to consistency between field-aligned current distribution and geomagnetic disturbances",
       S. Nakano and T. Iyemori,
    2004 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2004. (talk)
  15. "Solar activity dependence of two types of east-west geomagnetic disturbances at mid latitudes",
       S. Nakano,
       2004 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2004. (poster)
  16. "Estimation of global distribution of large-scale field-aligned currents from ground-based magnetic data at mid-latitude and polar-cap observatories",
       S. Nakano and T. Iyemori,
    The 28th Symposium on Space and Upper Atmospheric Sciences in the Polar Regions, Tokyo, Aug. 2004. (talk)
  17. "Variations of global distribution of large-scale field-aligned currents inferred from ground-based magnetic data at mid-latitude and polar-cap observatories",
       S. Nakano and T. Iyemori,
       116th SGEPSS Fall Meeting, Matsuyama, Sep. 2004. (poster)
  18. "Characteristics of daytime east-west geomagnetic variations at mid latitudes",
       S. Nakano and T. Iyemori,
       2005 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2005. (poster)
  19. "Data assimilation to resolve the ring current structure",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2006, Chiba, May. 2006. (talk)
  20. "Improvement of a ring current model through data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       The 30th Symposium on Space and Upper Atmospheric Sciences in the Polar Regions, Tokyo, Aug. 2006. (talk)
  21. "Estimation of the ring current structure and the inner-magnetospheric electric field through data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       120th SGEPSS Fall Meeting, Sagamihara, Nov. 2006. (talk)
  22. "Sequential data assimilation techniques and their application",
       S. Nakano, G. Ueno, K. Nakamura, and T. Higuchi,
       Japan Geoscience Union Meeting 2007, Chiba, May. 2007. (talk)
  23. "Relationship between the ring current structure and the electric potential distribution in the inner-magnetosphere deduced from data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       Japan Geoscience Union Meeting 2007, Chiba, May. 2007. (talk)
  24. "Data assimilation of global ENA data into a ring current model",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       The 31st Symposium on Space and Upper Atmospheric Sciences in the Polar Regions, Tokyo, Jul. 2007. (talk)
  25. "Merging particle filter for high dimensional problems",
       S. Nakano, G. Ueno, K. Nakamura, and T. Higuchi,
       The 2007 Japanese Joint Statistical Meeting, Kobe, Sep. 2007. (talk)
  26. "Data assimilation approach for estimating unknown factors in a kinetic ring current model",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       122nd SGEPSS Fall Meeting, Nagoya, Sep. 2007. (poster)
  27. "Use of the merging particle filter for the estimation of an uncertain parameter in nonlinear system models",
       S. Nakano, G. Ueno, and T. Higuchi,
       Japan Geoscience Union Meeting 2008, Chiba, May. 2008. (poster)
  28. "Modeling of evolution of magnetospheric ring current using a data assimilation approach",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, D. G. Mitchell, K. Keika, and T. Higuchi,
       Japan Geoscience Union Meeting 2008, Chiba, May. 2008. (poster)
  29. "Feasibility of data assimilation of multi-satellite measurements for ring current modeling",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, and T. Higuchi,
       Japan Geoscience Union Meeting 2008, Chiba, May. 2008. (poster)
  30. "Relationship between the Region-2 current intensity and the solar-wind dynamic pressure",
       S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
       124th SGEPSS Fall Meeting, Sendai, Oct. 2008. (talk)
  31. "Long-term component of the variation of the Dst index",
       S. Nakano and T. Higuchi,
       Japan Geoscience Union Meeting 2009, Chiba, May. 2009. (poster)
  32. "Nested particle filter algorithm for data assimilation in parallel computing systems",
       S. Nakano, G. Ueno, K. Nakamura, and T. Higuchi,
       Japan Geoscience Union Meeting 2009, Chiba, May. 2009. (poster)
  33. "Estimation of spatial distribution of magnetospheric plasma using data assimilation",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       The 58th National Congress of Theoretical and Applied Mechanics, Tokyo, Jun. 2009. (talk)
  34. "State estimation using the merging particle filter --An application to space science--",
       S. Nakano, G. Ueno, Y. Ebihara, M.-C. Fok, S. Ohtani, P. C. Brandt, and T. Higuchi,
       The 2009 Japanese Joint Statistical Meeting, Kyotanabe, Sep. 2009. (talk)
  35. "Feasibility of EUV data assimilation for the modeling of the plasmasphere",
       S. Nakano, G. Ueno, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       126th SGEPSS Fall Meeting, Kanazawa, Sep. 2009. (poster)
  36. "Application of data assimilation technique for the modeling of the plasmasphere using EUV imaging data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2010, Chiba, May. 2010. (poster)
  37. "Estimation of the distribution of plasmaspheric plasma via data assimilation of extraordinary ultraviolet data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       The 59th National Congress of Theoretical and Applied Mechanics, Tokyo, Jun. 2010. (talk)
  38. "State estimation for high-dimensional nonlinear systems using a massively parallel computer",
       S. Nakano and T. Higuchi,
       The 2010 Japanese Joint Statistical Meeting, Tokyo, Sep. 2010. (talk)
  39. "Subannual variation in the Dst index and its relationship with solar-wind parameters",
       S. Nakano, T. Higuchi,
       128th SGEPSS Fall Meeting, Naha, Nov. 2010. (talk)
  40. "Data assimilation of EUV imaging data for modeling the plasmasphere",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       The 34th Symposium on Space and Upper Atmospheric Sciences in the Polar Regions, Tachikawa, Dec. 2010. (talk)
  41. "Alternately lattice-pattern switching strategy for the particle filter on a massively parallel computer",
       S. Nakano and T. Higuchi,
       The 60th National Congress of Theoretical and Applied Mechanics, Tokyo, Mar. 2011. (talk)
  42. "Application of the particle filter to data assimilation for a plasmasphere model",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2011, Chiba, May. 2011. (talk)
  43. "Classification and evaluation of noise and signal components in ENA data from Mars Express",
       S. Nakano and Y. Futaana,
       Japan Geoscience Union Meeting 2011, Chiba, May. 2011. (poster)
  44. "Relationship between the quiet-time level of magnetic H component at mid-latitudes and long-term solar-wind activity",
       S. Nakano, H. Nagao, and T. Higuchi,
       Japan Geoscience Union Meeting 2011, Chiba, May. 2011. (poster)
  45. "Estimation of temporal evolution of the plasmasphere using IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2011, Chiba, May. 2011. (talk)
  46. "Long-term variation of geomagnetic field deduced using the merging particle filter",
       S. Nakano and T. Higuchi,
       The 2011 Japanese Joint Statistical Meeting, Fukuoka, Sep. 2011. (talk)
  47. "Modeling of the plasmasphere with data assimilation of IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       130th SGEPSS Fall Meeting, Kobe, Nov. 2011. (poster)
  48. "Use of imaging observations of the Earth's magnetosphere with data assimilation",
       S. Nakano,
       The 14th Information-Based Induction Sciences Workshop (IBIS 2011), Nara, Nov. 2011. (invited talk)
  49. "Long-term variations of quiet-time geomagnetic H components on the nightside at mid latitudes",
       S. Nakano, H. Nagao, and T. Higuchi,
       Japan Geoscience Union Meeting 2012, Chiba, May. 2012. (poster)
  50. "Estimation of the spatial structure of the plasmasphere using a data assimilation technique",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2012, Chiba, May. 2012. (talk)
  51. "Representation of predictive distribution for data assimilation in high dimensional systems",
       S. Nakano,
       The 2012 Japanese Joint Statistical Meeting, Sapporo, Sep. 2012. (talk)
  52. "Two-dimensional structure of the plasmasphere estimated by the ensemble transform Kalman filter",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       132nd SGEPSS Fall Meeting, Sapporo, Oct. 2012. (poster)
  53. "A hybrid algorithm of ensemble transform Kalman filter and particle filter",
       S. Nakano,
       The 62nd National Congress of Theoretical and Applied Mechanics, Tokyo, Mar. 2013. (talk)
  54. "Spatial distribution of the plasmaspheric ions estimated by assimilation of IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2013, Chiba, May. 2013. (talk)
  55. "Inversion method for estimating the helium ion density distribution in the plasmasphere based on IMAGE/EUV data",
       S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi,
       Japan Geoscience Union Meeting 2014, Yokohama, Apr. 2014. (talk)
  56. "Construction of a dynamic typhoon trasnlation model considering seasonal variation",
       S. Nakano, K. Suzuki, and G. Ueno,
       The 2014 Japanese Joint Statistical Meeting, Tokyo, Sep. 2014. (talk)

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