Zobrazeno 1 - 10
of 166
pro vyhledávání: '"Nozomu Nishitani"'
Autor:
Ryuho Kataoka, Yoshizumi Miyoshi, Kazuo Shiokawa, Nozomu Nishitani, Kunihiro Keika, Takanobu Amano, Kanako Seki
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 12, Pp n/a-n/a (2024)
Abstract We report a citizen science‐motivated study on the cause of an unusually bright red aurora as witnessed from Hokkaido, Japan during a magnetic storm on 1 December 2023. The auroral brightness of 5 kR is unusual for the Dst index peak of on
Externí odkaz:
https://doaj.org/article/90f6c755cdeb46d49c2120bca5ed5c96
Autor:
Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Perwitasari Septi, Takuo Tsuda, Nozomu Nishitani, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Yoshiya Kasahara, Ayako Matsuoka, Satoko Nakamura, Yoshizumi Miyoshi, Iku Shinohara
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-27 (2023)
Abstract The Hunga Tonga–Hunga Ha’apai (HTHH) undersea volcanic eruption that occurred at 04:15 UT on 15 January 2022 is one of the most explosive events in the modern era, and a vertical plume reached approximately 55 km, corresponding to a heig
Externí odkaz:
https://doaj.org/article/97fdbb728f2d4a75892f305bf1ab11d7
Autor:
Larry R. Lyons, Yukitoshi Nishimura, Jiang Liu, Sneha Yadav, Ying Zou, William A. Bristow, Eric Donovan, Nozomu Nishitani
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2024)
Flow channels can extend across the polar cap from the dayside to the nightside auroral oval, where they lead to localized reconnection and auroral oval disturbances. Such flow channels can persist within the polar cap >1½ hours, can move azimuthall
Externí odkaz:
https://doaj.org/article/610649d188da479bb20d1a3d089f0b34
Autor:
Shin-ichiro Oyama, Anita Aikio, Takeshi Sakanoi, Keisuke Hosokawa, Heikki Vanhamäki, Lei Cai, Ilkka Virtanen, Marcus Pedersen, Kazuo Shiokawa, Atsuki Shinbori, Nozomu Nishitani, Yasunobu Ogawa
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-13 (2023)
Abstract Ion drag associated with the ionospheric plasma convection plays an important role in the high-latitude thermospheric dynamics, yet changes in the thermospheric wind with geomagnetic activity are not fully understood. We performed a statisti
Externí odkaz:
https://doaj.org/article/12474185579b450188a60e5cd3dcdc32
Autor:
Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, Nozomu Nishitani
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-17 (2022)
Abstract To elucidate the characteristics of electromagnetic conjugacy of traveling ionospheric disturbances just after the 15 January 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption, we analyze Global Navigation Satellite System-total electron co
Externí odkaz:
https://doaj.org/article/3ca1c11600734e51a6c985da5ecd40a0
Autor:
Larry R. Lyons, Yukitoshi Nishimura, Jiang Liu, Ying Zou, William A. Bristow, Sneha Yadav, Eric Donovan, Nozomu Nishitani, Kazuo Shiokawa, Keisuke Hosokawa
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
Dynamic mesoscale flow structures move across the open field line regions of the polar caps and then enter the nightside plasma sheet where they can cause important space weather disturbances, such as streamers, substorms, and omega bands. The polar
Externí odkaz:
https://doaj.org/article/38098f70844c452fac4b630ea420de7b
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-2 (2023)
Externí odkaz:
https://doaj.org/article/7d06cdd036184f50a2292cf8f704a03a
Autor:
Alexander V. Koustov, Sydney Ullrich, Pavlo V. Ponomarenko, Robert G. Gillies, David R. Themens, Nozomu Nishitani
Publikováno v:
Earth, Planets and Space, Vol 72, Iss 1, Pp 1-14 (2020)
Abstract Measurements of the electron density at the F region peak by the Canadian Advanced Digital Ionosonde (CADI) and the Resolute Incoherent Scatter Radar (RISR) are used to assess the quality of peak electron density estimates made from elevatio
Externí odkaz:
https://doaj.org/article/e3e4af172750418795d599d527f83dce
Autor:
Alexander V. Koustov, Sydney Ullrich, Pavlo V. Ponomarenko, Nozomu Nishitani, Federica M. Marcucci, William A. Bristow
Publikováno v:
Earth, Planets and Space, Vol 71, Iss 1, Pp 1-17 (2019)
Abstract Observations by six Super Dual Auroral Radar Network (SuperDARN) polar cap radars, three in the northern hemisphere and three in the southern hemispheres, are considered to assess F region echo occurrence rates over solar, season, and day cy
Externí odkaz:
https://doaj.org/article/e112a56aa26149929735f507b9c95468
Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars
Autor:
Nozomu Nishitani, John Michael Ruohoniemi, Mark Lester, Joseph Benjamin Harold Baker, Alexandre Vasilyevich Koustov, Simon G. Shepherd, Gareth Chisham, Tomoaki Hori, Evan G. Thomas, Roman A. Makarevich, Aurélie Marchaudon, Pavlo Ponomarenko, James A. Wild, Stephen E. Milan, William A. Bristow, John Devlin, Ethan Miller, Raymond A. Greenwald, Tadahiko Ogawa, Takashi Kikuchi
Publikováno v:
Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-57 (2019)
Abstract The Super Dual Auroral Radar Network (SuperDARN) is a network of high-frequency (HF) radars located in the high- and mid-latitude regions of both hemispheres that is operated under international cooperation. The network was originally design
Externí odkaz:
https://doaj.org/article/0372cd4bc9474f34b33f98de42ccd740