Publications and Presentations
Longitudinal dependence of eastward and westward magnetic variations at midlatitudes
,
S. Nakano and T. Iyemori,
Adv. Polar Upper Atmos. Res., v. 15, pp. 128134, 2001.
Local time features of geomagnetic jerks
,
H. Nagao, T. Iyemori, T. Higuchi, S. Nakano, and T. Araki,
Earth Planets Space, v. 54, pp. 119131, 2002.
Net fieldaligned 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.
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.
Local time distribution of net fieldaligned currents derived from highaltitude satellite data
,
S. Nakano and T. Iyemori,
J. Geophys. Res., v. 108 (A8), 1314, doi:10.1029/2002JA009519, 2003.
Solar activity dependence of two types of eastwest geomagnetic disturbances at mid latitudes
,
S. Nakano,
Adv. Polar Upper Atmos. Res., v. 18, pp. 2334, 2004.
Stormtime fieldaligned currents on the nightside inferred from groundbased 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.

Merging particle filter for sequential data assimilation
,
S. Nakano, G. Ueno, and T. Higuchi,
Nonlin. Processes Geophys., v. 14, pp. 395408, 2007.

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.

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.

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. 225234, 2008 (in Japanese).

Impact of the solarwind dynamic pressure on the Region2 fieldaligned currents
,
S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
J. Geophys. Res., V. 114, A02221, doi:10.1029/2008JA013674, 2009.

Estimation of a longterm variation of a magnetic storm index using the merging particle filter
,
S. Nakano and T. Higuchi,
IEICE Trans. Inf. Syst., v. E92D, pp. 13821387, 2009.

Nonstorm irregular variation of the D_{st} index
,
S. Nakano and T. Higuchi,
Ann. Geophys., v. 30, pp. 153162, 2012.

Hybrid algorithm of ensemble transform and importance sampling
for assimilation of nonGaussian observations
,
S. Nakano,
Tellus A, v. 66, 21429,
doi:10.3402/tellusa.v66.21429, 2014.

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. 37243740, doi:10.1002/2013JA019733, 2014.

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. 37083723, doi:10.1002/2013JA019734, 2014.
 "Populationbased quasiBayesian algorithm for highdimensional 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.
 "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.
 "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.
 "Weight adjustment of the particle filter on distributed computing systems",
S. Nakano and T. Higuchi,
Proceedings of 15th International Conference on Information
Fusion, pp. 24802485, 2012.
 "A prediction algorithm with a limited number of particles
for state estimation of highdimensional systems",
S. Nakano,
Proceedings of 16th International Conference on Information
Fusion, pp. 13561363, 2013.

"Localtime distribution of net fieldaligned currents derived from highaltitude satellite data",
S. Nakano and T. Iyemori,
EGSAGUEUG Joint Assembly 2003, Nice, France, Apr. 2003. (poster)
(Geophys. Res. Abstr., 5, 03079.)
 "Effects of the interplanetary magnetic field and substorms on nightside upward fieldaligned currents during stormtime inferred from geomagnetic data at midlatitudes",
S. Nakano and T. Iyemori,
AGU 2003 Fall Meeting, San Francisco, USA, Dec. 2003. (poster)
(EOS Trans. AGU, 84(46), Fall Meet. Suppl., Abstract SM32A1146.)
 "Estimation of global distribution of largescale fieldaligned currents on the basis of groundbased magnetic data at midlatitudes and in the polarcap",
S. Nakano and T. Iyemori,
AGU 2004 Fall Meeting, San Francisco, USA, Dec. 2004. (poster)
(EOS Trans. AGU, 85(47), Fall Meet. Suppl., Abstract SM53A0398.)
 "Longterm variations in nightside geomagnetic disturbances at midlatitudes",
S. Nakano and T. Iyemori,
Xth IAGA Scientific Assembly, Toulouse, France, Jul. 2005. (poster)
 "Variations of fieldaligned currents on the nightside inferred from midlatitude groundbased geomagnetic data: Relationships with the IMF and substorms",
S. Nakano and T. Iyemori,
Xth IAGA Scientific Assembly, Toulouse, France, Jul. 2005. (talk)
 "A Data Assimilation Model of the Stormtime 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 SM13A0330.)
 "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.)
 "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.)
 "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 SM43B05.)
 "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)
 "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 SM14B03.)
 "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.)
 "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)
 "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)
 "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)
 "Variations in the ring current and innermagnetospheric 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 SM43E07.)
 "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, EGU2008A08008.)
 "Data assimilation of energetic neutral atom data for twodimensional
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, EGU2008A04916.)
 "A feasibility study of ring current modeling using data assimilation of multisatellite 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)
 "Estimation of an uncertain parameter in dynamic nonlinear models using ensemblebased data assimilation schemes",
S. Nakano, G. Ueno, and T. Higuchi,
AOGS 5th Annual General Meeting, Busan, the Republic of Korea, Jun. 2008. (talk)
 "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)
 "Effects of the solarwind dynamic pressure on the Region2 fieldaligned 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 SM53A1656.)
 "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, EGU200968191.)
 "Statistical analysis of influence of the solarwind pressure enhancement on the Region2 fieldaligned currents",
S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
XIth IAGA Scientific Assembly, Sopron, Hungary, Aug. 2009. (talk)
 "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)
 "Merging particle filter for highdimensional nonlinear problems",
S. Nakano, G. Ueno, and T. Higuchi,
The 5th WMO symposium on data assimilation, Melbourne, Australia, Oct. 2009. (poster) [Extended abstract]
 "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 SM51A1323.)
 "Populationbased quasiBayesian algorithm for highdimensional 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.)
 "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)
 "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 AsiaPacific Radio Science Conference,
Toyama, Japan, Sep. 2010. (poster)
 "Massively parallel particle filter and a grouping strategy",
S. Nakano and T. Higuchi,
XXVth IUGG General Assembly, Melbourne, Australia, Jul. 2011. (poster)
 "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)
 "Anticorrelation between the quiettime level of midlatitude magnetic field and longterm solarwind activity",
S. Nakano, H. Nagao, and T. Higuchi,
XXVth IUGG General Assembly, Melbourne, Australia, Jul. 2011. (talk)
 "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 SM33A2145.)
 "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)
 "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)
 "Estimation of the longterm 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, EGU201210726.)
 "Applicability of the particle filter for highdimensional problems using a
massively parallel computer",
S. Nakano and T. Higuchi,
EGU General Assembly 2012, Vienna, Austria, Apr. 2012. (poster)
(Geophys. Res. Abstr., 14, EGU20129181.)
 "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)
 "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)
 "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 NG43A1568.)
 "Comparison of two ways for representation of the forecast probability density function in ensemblebased sequential data assimilation",
S. Nakano,
EGU General Assembly 2013, Vienna, Austria, Apr. 2013. (talk)
(Geophys. Res. Abstr., 15, EGU201370291.)
 "A prediction algorithm with a limited number of particles
for state estimation of highdimensional systems",
S. Nakano,
16th International Conference on Information Fusion,
Istanbul, Turkey, Jul. 2013. (talk)
 "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)
 "A datadriven 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)
 "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)
 "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)
 "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)
 "An empirical Monte Carlo modeling of typhoon trajectories",
S. Nakano, K. Suzuki, and G. Ueno,
AOGS 11th Annual Meeting, Sapporo, Japan, Jul. 2014. (poster)
 "Baseline estimations of QL Dst index observatories",
S. Nakano, T. Kamei, and M. Sugiura,
The 106th SGEPSS Fall Meeting, Sendai, Nov. 1999. (poster)
 "Magnetic Effects of the FieldAligned Current on the Ground in middle latitudes",
S. Nakano and T. Iyemori,
2000 Japan Earth and Planetary Science Joint Meeting, Tokyo, Jun. 2000. (poster)
 "A longitudinal dependence of the eastward or westward
magnetic variations at midlatitudes",
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)
 "Eastward magnetic variations at midlatitudes on the nightside",
S. Nakano, T. Iyemori,
and S. Yamashita,
The 108th SGEPSS Fall Meeting, Tokyo, Nov. 2000. (talk)
 "A longitudinal dependence of eastward magnetic disturbances
at midlatitudes on the nightside",
S. Nakano and T. Iyemori,
2001 Japan Earth and Planetary Science Joint Meeting, Tokyo, Jun. 2001. (talk)
 "An estimation of current distribution in the inner magnetosphere",
S. Nakano and T. Iyemori,
110th SGEPSS Fall Meeting, Fukuoka, Nov. 2001. (poster)
 "Fieldaligned current distribution and geomagnetic disturbances",
S. Nakano, T. Iyemori, S. Yamashita,
2002 Japan Earth and Planetary Science Joint Meeting, Tokyo, May. 2002. (talk)
 "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)
 "Antisunward current system derived from highaltitude 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)
 "Some characteristics of eastwest geomagnetic disturbances at midlatitudes on the nightside",
S. Nakano and T. Iyemori,
112th SGEPSS Fall Meeting, Chofu, Nov. 2002. (poster)
 "Eastwest geomagnetic disturbances at midlatitudes 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)
 "Characteristics of upward fieldaligned 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)
 "Possible substorm effects on upward fieldaligned currents
on the nightside inferred from geomagnetic data at midlatitudes",
S. Nakano and T. Iyemori,
114th SGEPSS Fall Meeting, Toyama, Oct. 2003. (talk)
 "Another approach to consistency between fieldaligned current distribution and geomagnetic disturbances",
S. Nakano and T. Iyemori,
2004 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2004. (talk)
 "Solar activity dependence of two types of eastwest geomagnetic disturbances at mid latitudes",
S. Nakano,
2004 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2004. (poster)
 "Estimation of global distribution of largescale fieldaligned currents from groundbased magnetic data at midlatitude and polarcap observatories",
S. Nakano and T. Iyemori,
The 28th Symposium on Space and Upper Atmospheric Sciences in the Polar Regions, Tokyo, Aug. 2004. (talk)
 "Variations of global distribution of largescale fieldaligned currents inferred from groundbased magnetic data at midlatitude and polarcap observatories",
S. Nakano and T. Iyemori,
116th SGEPSS Fall Meeting, Matsuyama, Sep. 2004. (poster)
 "Characteristics of daytime eastwest geomagnetic variations at mid latitudes",
S. Nakano and T. Iyemori,
2005 Japan Earth and Planetary Science Joint Meeting, Chiba, May. 2005. (poster)
 "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)
 "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)
 "Estimation of the ring current structure and the innermagnetospheric 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)
 "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)
 "Relationship between the ring current structure and the electric potential distribution in the innermagnetosphere 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)
 "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)
 "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)
 "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)
 "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)
 "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)
 "Feasibility of data assimilation of multisatellite 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)
 "Relationship between the Region2 current intensity and the solarwind dynamic pressure",
S. Nakano, G. Ueno, S. Ohtani, and T. Higuchi,
124th SGEPSS Fall Meeting, Sendai, Oct. 2008. (talk)
 "Longterm component of the variation of the Dst index",
S. Nakano and T. Higuchi,
Japan Geoscience Union Meeting 2009, Chiba, May. 2009. (poster)
 "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)
 "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)
 "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)
 "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)
 "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)
 "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)
 "State estimation for highdimensional nonlinear systems using a massively parallel computer",
S. Nakano and T. Higuchi,
The 2010 Japanese Joint Statistical Meeting, Tokyo, Sep. 2010. (talk)
 "Subannual variation in the Dst index and its relationship with solarwind parameters",
S. Nakano, T. Higuchi,
128th SGEPSS Fall Meeting, Naha, Nov. 2010. (talk)
 "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)
 "Alternately latticepattern 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)
 "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)
 "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)
 "Relationship between the quiettime level of magnetic H component at midlatitudes and longterm solarwind activity",
S. Nakano, H. Nagao, and T. Higuchi,
Japan Geoscience Union Meeting 2011, Chiba, May. 2011. (poster)
 "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)
 "Longterm 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)
 "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)
 "Use of imaging observations of the Earth's magnetosphere with data assimilation",
S. Nakano,
The 14th InformationBased Induction Sciences Workshop (IBIS 2011), Nara, Nov. 2011. (invited talk)
 "Longterm variations of quiettime 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)
 "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)
 "Representation of predictive distribution for data assimilation in high
dimensional systems",
S. Nakano,
The 2012 Japanese Joint Statistical Meeting, Sapporo, Sep. 2012. (talk)
 "Twodimensional 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)
 "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)
 "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)
 "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)
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