Zobrazeno 1 - 10
of 454
pro vyhledávání: '"Kazuo Shiokawa"'
Autor:
Sota Nanjo, Gabriel Arne Hofstra, Kazuo Shiokawa, Atsuki Shinbori, Satonori Nozawa, Keisuke Hosokawa
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-14 (2024)
Abstract The phenomenon known as strong thermal emission velocity enhancement (STEVE) is a purple/mauve arc-shaped atmospheric glow observed at lower latitudes of the auroral oval on the duskside. Simultaneous observations using a ground-based camera
Externí odkaz:
https://doaj.org/article/666cea50343b4f7c820a5b78f65c5fca
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
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:
Claudia Martinez-Calderon, Tomoka Oonishi, Kazuo Shiokawa, Jyrki K. Manninen, Alexey Oinats, Mitsunori Ozaki
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-13 (2023)
Abstract Quasi-periodic (QP) emissions are a type of magnetospheric ELF/VLF waves characterized by a periodic intensity modulation ranging from tens of seconds to several minutes. Here, we present 63 QP events observed between January 2017 and Decemb
Externí odkaz:
https://doaj.org/article/40ad0011787b4d7d993cd42cc370538f
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:
Shin-ichiro Oyama, Heikki Vanhamäki, Lei Cai, Anita Aikio, Michael Rietveld, Yasunobu Ogawa, Tero Raita, Mirjam Kellinsalmi, Kirsti Kauristie, Boris Kozelov, Atsuki Shinbori, Kazuo Shiokawa, Takuo T. Tsuda, Takeshi Sakanoi
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-17 (2022)
Abstract The thermospheric wind response to a sudden westward turning of the ion velocity at a high latitude was studied by analyzing data obtained with a Fabry–Perot interferometer (FPI; 630 nm), Dynasonde, and Swarm A & C satellites during a conj
Externí odkaz:
https://doaj.org/article/f1c0d9a93a554d81ae5f7ef5e41bf4bf
Autor:
Mitsunori Ozaki, Kazuo Shiokawa, Ryuho Kataoka, Martin Mlynczak, Larry Paxton, Martin Connors, Satoshi Yagitani, Shion Hashimoto, Yuichi Otsuka, Satoshi Nakahira, Ian Mann
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-11 (2022)
Abstract Relativistic electron precipitation (REP) from the Earth’s radiation belt plays an important role in mesospheric ozone loss as a connection between space weather and the climate system. However, the rapid (tens of minutes) destruction of m
Externí odkaz:
https://doaj.org/article/1fb4502d423441d98d55246d8837e012
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
Autor:
George Ochieng Ondede, A. B. Rabiu, Daniel Okoh, Paul Baki, Joseph Olwendo, Kazuo Shiokawa, Yuichi Otsuka
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
The study of ionospheric irregularities is important since many technological systems might be influenced by the ionosphere. In this work, we use data from the Global Navigation Satellite Systems (GNSS) receiver installed in Abuja, Nigeria, GPS Scint
Externí odkaz:
https://doaj.org/article/1673f99b9089409b8a57e70a4302d4dc
Autor:
Kanya Kusano, Kiyoshi Ichimoto, Mamoru Ishii, Yoshizumi Miyoshi, Shigeo Yoden, Hideharu Akiyoshi, Ayumi Asai, Yusuke Ebihara, Hitoshi Fujiwara, Tada-Nori Goto, Yoichiro Hanaoka, Hisashi Hayakawa, Keisuke Hosokawa, Hideyuki Hotta, Kornyanat Hozumi, Shinsuke Imada, Kazumasa Iwai, Toshihiko Iyemori, Hidekatsu Jin, Ryuho Kataoka, Yuto Katoh, Takashi Kikuchi, Yûki Kubo, Satoshi Kurita, Haruhisa Matsumoto, Takefumi Mitani, Hiroko Miyahara, Yasunobu Miyoshi, Tsutomu Nagatsuma, Aoi Nakamizo, Satoko Nakamura, Hiroyuki Nakata, Naoto Nishizuka, Yuichi Otsuka, Shinji Saito, Susumu Saito, Takashi Sakurai, Tatsuhiko Sato, Toshifumi Shimizu, Hiroyuki Shinagawa, Kazuo Shiokawa, Daikou Shiota, Takeshi Takashima, Chihiro Tao, Shin Toriumi, Satoru Ueno, Kyoko Watanabe, Shinichi Watari, Seiji Yashiro, Kohei Yoshida, Akimasa Yoshikawa
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-29 (2021)
Abstract Although solar activity may significantly impact the global environment and socioeconomic systems, the mechanisms for solar eruptions and the subsequent processes have not yet been fully understood. Thus, modern society supported by advanced
Externí odkaz:
https://doaj.org/article/da97472c80ab47bcb6e874f2ad039b84