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Dive into the research topics where T. Hori is active.

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Featured researches published by T. Hori.


Geophysical monograph | 2013

The Energization and Radiation in Geospace (ERG) Project

Yoshizumi Miyoshi; Takayuki Ono; Takeshi Takashima; Kazushi Asamura; M. Hirahara; Yasumasa Kasaba; Ayako Matsuoka; Hirotsugu Kojima; K. Shiokawa; Kanako Seki; M. Fujimoto; Tsutomu Nagatsuma; C. Z. Cheng; Y. Kazama; Satoshi Kasahara; Takefumi Mitani; H. Matsumoto; Nana Higashio; Atsushi Kumamoto; Satoshi Yagitani; Yoshiya Kasahara; Keigo Ishisaka; Lars G. Blomberg; Akiko Fujimoto; Yuto Katoh; Yusuke Ebihara; Yoshiharu Omura; M. Nosé; T. Hori; Y. Miyashita

The Energization and Radiation in Geospace (ERG) project for solar cycle 24 will explore how relativistic electrons in the radiation belts are generated during space storms. This geospace exploration project consists of three research teams: the ERG satellite observation team, the ground-based network observation team, and the integrated data analysis/simulation team. Satellite observation will provide in situ measurements of features such as the plasma distribution function, electric and magnetic fields, and plasma waves, whereas remote sensing by ground-based observations using, for example, HF radars, magnetometers, optical instruments, and radio wave receivers will provide the global state of the geospace. Various kinds of data will be integrated and compared with numerical simulations for quantitative understanding. Such a synergetic approach is essential for comprehensive understanding of relativistic electron generation/loss processes through crossenergy and cross-regional coupling in which different plasma populations and regions are dynamically coupled with each other. In addition, the ERG satellite will utilize a new and innovative measurement technique for wave-particle interactions that can directly measure the energy exchange process between particles and plasma waves. In this paper, we briefly review some of the profound problems regarding relativistic electron accelerations and losses that will be solved by the ERG project, and we provide an overview of the project.


Journal of Geophysical Research | 2017

SC‐Associated Electric Field Variations in the Magnetosphere and Ionospheric Convective Flows

Sunjung Kim; Kyoung-Ho Kim; H.-J. Kwon; Ho Jin; Eun-Ok Lee; G. Jee; Nozomu Nishitani; T. Hori; M. Lester; J. R. Wygant

We examine magnetic and electric field perturbations associated with a sudden commencement (SC), caused by an interplanetary (IP) shock passing over the Earths magnetosphere on 16 February 2013. The SC was identified in the magnetic and electric field data measured at THEMIS-E (THE-E: MLT = 12.4, L = 6.3), Van Allen Probe-A (VAP-A: MLT = 3.2, L = 5.1), and Van Allen Probe-B (VAP-B: MLT = 0.2. L= 4.9) in the magnetosphere. During the SC interval, THE-E observed a dawnward-then-duskward electric (E) field perturbation around noon, while VAP-B observed a duskward E-field perturbation around midnight. VAP-A observed a dawnward-then-duskward E-field perturbation in the postmidnight sector, but the duration and magnitude of the dawnward E-perturbation are much shorter and weaker than that at THE-E. That is, the E-field signature changes with local time during the SC interval. The SuperDARN radar data indicate that the ionospheric plasma motions during the SC are mainly due to the E-field variations observed in space. This indicates that the SC-associated E-field in space plays a significant role in determining the dynamic variations of the ionospheric convection flow. By comparing previous SC MHD simulations and our observations, we suggest that the E-field variations observed at the spacecraft are produced by magnetospheric convection flows due to deformation of the magnetosphere as the IP shock sweeps the magnetopause.


Space Weather-the International Journal of Research and Applications | 2009

Measurements of geomagnetically induced current in a power grid in Hokkaido, Japan

Shinichi Watari; Manabu Kunitake; K. Kitamura; T. Hori; T. Kikuchi; K. Shiokawa; Nozomu Nishitani; Ryuho Kataoka; Y. Kamide; T. Aso; Y. Watanabe; Y. Tsuneta


Geophysical monograph | 2013

The distant magnetotail : Its structure, IMF dependence, and thermal properties

K. Maezawa; T. Hori


Journal of Geophysical Research | 2012

Photoelectron flows in the polar wind during geomagnetically quiet periods

N. Kitamura; Kanako Seki; Y. Nishimura; Naoki Terada; Takayuki Ono; T. Hori; Robert J. Strangeway


Journal of Geophysical Research | 2011

Transport and loss of the inner plasma sheet electrons: THEMIS observations

Satoshi Kurita; Yoshizumi Miyoshi; Fuminori Tsuchiya; Y. Nishimura; T. Hori; Y. Miyashita; T. Takada; Akira Morioka; V. Angelopoulos; J. P. McFadden; H. U. Auster; J. M. Albert; V. K. Jordanova; Hiroaki Misawa


Journal of Geophysical Research | 2012

Magnetospheric responses to the passage of the interplanetary shock on 24 November 2008

K.‐H. Kim; Dong-Hun Lee; K. Shiokawa; Ensang Lee; Jongyeob Park; H.-J. Kwon; V. Angelopoulos; Y. D. Park; Junga Hwang; Nozomu Nishitani; T. Hori; Kiyokazu Koga; Takahiro Obara; K. Yumoto; D. G. Baishev


Space Weather-the International Journal of Research and Applications | 2009

Correction to “Measurements of geomagnetically induced current in a power grid in Hokkaido, Japan”

Shinichi Watari; Manabu Kunitake; K. Kitamura; T. Hori; T. Kikuchi; K. Shiokawa; Nozomu Nishitani; Ryuho Kataoka; Y. Kamide; T. Aso; Y. Watanabe; Y. Tsuneta


Geophysical Research Letters | 2005

Plasma transport from multicomponent approach

A. T. Y. Lui; T. Hori; Genta Ueno; T. Mukai


Journal of Geophysical Research | 2012

Evolution of negative SI-induced ionospheric flows observed by SuperDARN King Salmon HF radar

T. Hori; Atsuki Shinbori; Nozomu Nishitani; Takashi Kikuchi; Shigeru Fujita; Tsutomu Nagatsuma; Oleg Troshichev; K. Yumoto; A. Moiseyev; Kanako Seki

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Ryuho Kataoka

National Institute of Polar Research

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