Zobrazeno 1 - 10
of 229
pro vyhledávání: '"Akira Kadokura"'
Autor:
Yuki Obana, Kaori Sakaguchi, Masahito Nosé, Keisuke Hosokawa, Peter Jaquiery, Satoko Saita, Kazuo Shiokawa, Martin Connors, Akira Kadokura, Tsutomu Nagatsuma, Tanja Petersen
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-18 (2024)
Abstract This paper describes the instrumentation and the first results of an upper atmospheric observing project conducted in New Zealand. We operate an all-sky aurora camera and a 64-Hz sampling induction magnetometer at Middlemarch, as well as 1-H
Externí odkaz:
https://doaj.org/article/ad33343a04d446b68aea597f7f7c64f5
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
We have identified nearly 1,000 onsets using two pairs of hemispheric conjugate ground magnetometers where the onset is defined based on a sharp decline in the H component of the magnetic field at a ground magnetometer station. Specifically, we used
Externí odkaz:
https://doaj.org/article/9b4844bfcdbd44dfac8fb5c5c61d67e1
Autor:
Takashi Kikuchi, Tohru Araki, Kumiko K. Hashimoto, Yusuke Ebihara, Takashi Tanaka, Yukitoshi Nishimura, Geeta Vichare, Ashwini K. Sinha, Jaroslav Chum, Keisuke Hosokawa, Ichiro Tomizawa, Yoshimasa Tanaka, Akira Kadokura
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
The present article aims at a consistent understanding of observation, theoretical model, and simulation with the geomagnetic sudden commencement (SC) observed in the morning and afternoon at high and middle latitudes in the northern and southern hem
Externí odkaz:
https://doaj.org/article/96ca89ac53314656898d3f340499ea38
Publikováno v:
Data Science Journal, Vol 21, Iss 1 (2022)
The Polar Environment Data Science Center (PEDSC) is one of the centers of the Joint Support-Center for Data Science Research (DS) of the Research Organization of Information and Systems (ROIS), which was established in 2017. The purpose of the PEDSC
Externí odkaz:
https://doaj.org/article/a7f31060e4e943569648835400a41f0f
Autor:
Shin Arita (Kakioka Magnetic Observatory, Japan Meteorological Agency), Tomofumi I (Seismology and Volcanology Department, Japan Meteorlogical Agency), Junpei Oogi (Kakioka Magnetic Observatory, Japan Meteorological Agency), Kosuke Takahashi (Seismology and Volcanology Department, Japan Meteorlogical Agency), Akira Kadokura (National Institute of Polar Research), Yasuhiro Minamoto (Laboratory for Environmental Research at Mount Fuji, NPO Mount Fuji Research Station)
Publikováno v:
Antarctic Record, Vol 64, Pp 1-20 (2020)
At Syowa Station, Antarctica, the baseline values, or the difference between the absolute and continuous measurements, vary relatively significantly in summer. They are possibly due to artificial disturbances from magnetized objects, and/or changes o
Externí odkaz:
https://doaj.org/article/d7cd1f47de704255aa977a7d6ef2e02e
Autor:
Mitsunori Ozaki, Yoshizumi Miyoshi, Kazuo Shiokawa, Keisuke Hosokawa, Shin-ichiro Oyama, Ryuho Kataoka, Yusuke Ebihara, Yasunobu Ogawa, Yoshiya Kasahara, Satoshi Yagitani, Yasumasa Kasaba, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Yuto Katoh, Mitsuru Hikishima, Satoshi Kurita, Yuichi Otsuka, Robert C. Moore, Yoshimasa Tanaka, Masahito Nosé, Tsutomu Nagatsuma, Nozomu Nishitani, Akira Kadokura, Martin Connors, Takumi Inoue, Ayako Matsuoka, Iku Shinohara
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019)
Electron precipitation plays major role in magnetospheric physics and space weather. Here the authors show nonlinear behavior of the wave–particle interaction in the magnetosphere as the evolution of chorus electromagnetic waves detected by the Ara
Externí odkaz:
https://doaj.org/article/a8e8ab072ee84a02aa87d6b8d7a78197
Autor:
Ryuho Kataoka, Takanori Nishiyama, Yoshimasa Tanaka, Akira Kadokura, Herbert Akihito Uchida, Yusuke Ebihara, Mitsumu K. Ejiri, Yoshihiro Tomikawa, Masaki Tsutsumi, Kaoru Sato, Yoshizumi Miyoshi, Kazuo Shiokawa, Satoshi Kurita, Yoshiya Kasahara, Mitsunori Ozaki, Keisuke Hosokawa, Shoya Matsuda, Iku Shinohara, Takeshi Takashima, Tatsuhiko Sato, Takefumi Mitani, Tomoaki Hori, Nana Higashio
Publikováno v:
Earth, Planets and Space, Vol 71, Iss 1, Pp 1-10 (2019)
Abstract Transient mesospheric echo in the VHF range was detected at an altitude of 65–70 km during the auroral breakup that occurred from 2220 to 2226 UT on June 30, 2017. During this event, the footprint of the Arase satellite was located within
Externí odkaz:
https://doaj.org/article/aaf6da4cd7f742bf8232d03c550591e6
Autor:
Kazuo Shiokawa, Yasuo Katoh, Yoshiyuki Hamaguchi, Yuka Yamamoto, Takumi Adachi, Mitsunori Ozaki, Shin-Ichiro Oyama, Masahito Nosé, Tsutomu Nagatsuma, Yoshimasa Tanaka, Yuichi Otsuka, Yoshizumi Miyoshi, Ryuho Kataoka, Yuki Takagi, Yuhei Takeshita, Atsuki Shinbori, Satoshi Kurita, Tomoaki Hori, Nozomu Nishitani, Iku Shinohara, Fuminori Tsuchiya, Yuki Obana, Shin Suzuki, Naoko Takahashi, Kanako Seki, Akira Kadokura, Keisuke Hosokawa, Yasunobu Ogawa, Martin Connors, J. Michael Ruohoniemi, Mark Engebretson, Esa Turunen, Thomas Ulich, Jyrki Manninen, Tero Raita, Antti Kero, Arto Oksanen, Marko Back, Kirsti Kauristie, Jyrki Mattanen, Dmitry Baishev, Vladimir Kurkin, Alexey Oinats, Alexander Pashinin, Roman Vasilyev, Ravil Rakhmatulin, William Bristow, Marty Karjala
Publikováno v:
Earth, Planets and Space, Vol 69, Iss 1, Pp 1-21 (2017)
Abstract The plasmas (electrons and ions) in the inner magnetosphere have wide energy ranges from electron volts to mega-electron volts (MeV). These plasmas rotate around the Earth longitudinally due to the gradient and curvature of the geomagnetic f
Externí odkaz:
https://doaj.org/article/232ecf4e2caa48c9a1d198ff31cfe027
Autor:
Keisuke Hosokawa, Yasuo Takeda, Tadahiko Ogawa, Akira Kadokura, Akira Sessai Yukimatu, Natsuo Sato
Publikováno v:
Antarctic Record, Vol 57, Iss 3, Pp 317-328 (2013)
This paper reports simultaneous observations of visible noctilucent clouds (NLC) and polar mesosphere summer echoes (PMSE) at Syowa Station (69°01′S, 38°61′E) in Antarctica. During a 1.5 h interval from 2000 to 2130 UT (2300 to 0030 LT) on Feb.
Externí odkaz:
https://doaj.org/article/181fec40aa7c486e985badb5b5acaff3
Publikováno v:
Antarctic Record, Vol 57, Iss 1, Pp 151-161 (2013)
During 2010 and 2011, some large facilities (e.g. a mechanical workshop, an atmospheric radar and a container yard) were constructed near the geomagnetic observation site at Syowa Station, Antarctica. Iron materials used in these facilities could pot
Externí odkaz:
https://doaj.org/article/5d85fbbc8eed4ee1aba8616040f4ffe9