Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Takuo T. Tsuda"'
Autor:
Takanori Nishiyama, Masato Kagitani, Senri Furutachi, Yuki Iwasa, Yasunobu Ogawa, Takuo T. Tsuda, Peter Dalin, Fuminori Tsuchiya, Satonori Nozawa, Fred Sigernes
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-9 (2024)
Abstract This study presents a first simultaneous observation of $$\mathrm {N_{2}^{+}}$$ N 2 + Meinel (0,0) band (hereafter, $$\mathrm {N_{2}^{+}}$$ N 2 + (M)) aurora by cutting-edge short-wavelength infrared imaging spectrograph (NIRAS-2) and monoch
Externí odkaz:
https://doaj.org/article/2dd7d8c20b0d4324893da652d3f506fb
Autor:
Satonori Nozawa, Norihito Saito, Takuya Kawahara, Satoshi Wada, Takuo T. Tsuda, Sakiho Maeda, Toru Takahashi, Hitoshi Fujiwara, Viswanathan Lakshmi Narayanan, Tetsuya Kawabata, Magnar G. Johnsen
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-19 (2023)
Abstract We have studied the convective (or static) and dynamic instabilities between 80 and 100 km above Tromsø (69.6° N, 19.2° E) using temperature and wind data of 6 min and 1 km resolutions primarily almost over a solar cycle obtained with the
Externí odkaz:
https://doaj.org/article/2a08e1c8851e4346a0a510014fb8fde4
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:
Sota Nanjo, Satonori Nozawa, Masaki Yamamoto, Tetsuya Kawabata, Magnar G. Johnsen, Takuo T. Tsuda, Keisuke Hosokawa
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022)
Abstract The activity of citizen scientists who capture images of aurora borealis using digital cameras has recently been contributing to research regarding space physics by professional scientists. Auroral images captured using digital cameras not o
Externí odkaz:
https://doaj.org/article/4dbee1b0faf4462692a49c94f3b59044
Autor:
Hidehiko Suzuki, Ayako Matsumoto, Peter Dalin, Yuriko Nakamura, Satoshi Ishii, Kazuyo Sakanoi, Kaori Sakaguchi, Taku Takada, Takuo T. Tsuda, Yuta Hozumi
Publikováno v:
Progress in Earth and Planetary Science, Vol 9, Iss 1, Pp 1-10 (2022)
Abstract The exact occurrence frequency of noctilucent clouds (NLCs) in middle latitudes is significant information because it is thought to be sensitive to long-term atmospheric change. We conducted NLC observation from airline jets in the Northern
Externí odkaz:
https://doaj.org/article/5303167eed034f808f5f046e15b95545
Autor:
Mitsumu K. Ejiri, Takuji Nakamura, Takuo T. Tsuda, Takanori Nishiyama, Makoto Abo, Toru Takahashi, Katsuhiko Tsuno, Takuya D. Kawahara, Takayo Ogawa, Satoshi Wada
Publikováno v:
Earth, Planets and Space, Vol 71, Iss 1, Pp 1-10 (2019)
Abstract The vertical fine structures and the time evolution of plasma irregularities in the sporadic E (E s) layer were observed via calcium ion (Ca+) density measurements using a resonance scattering lidar with a high time-height resolution (5 s an
Externí odkaz:
https://doaj.org/article/e22b1c1f45b54e41963f6c3a17bd5fc5
Autor:
Shin-ichiro Oyama, Takuo T. Tsuda, Keisuke Hosokawa, Yasunobu Ogawa, Yoshizumi Miyoshi, Satoshi Kurita, Antti E. Kero, Ryoichi Fujii, Yoshimasa Tanaka, Akira Mizuno, Tetsuya Kawabata, Björn Gustavsson, Thomas Leyser
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-7 (2018)
Abstract One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic oxygen. This line has been adopted, along with another E-region emission line, for
Externí odkaz:
https://doaj.org/article/8a0e0daf0d8c48dab1dc329c81eb5dc2
Publikováno v:
Antarctic Record, Vol 57, Iss 3, Pp 339-356 (2013)
This study aimed to develop a methodology for estimating ionospheric conductance at auroral latitudes using data from a multi-wavelength photometer (427.8, 557.7, and 630.0 nm). An advantage of the approach is that the ionosphere is divided into laye
Externí odkaz:
https://doaj.org/article/d3bde42787784b158edf6a20561ab037
Publikováno v:
Journal of Geophysical Research: Space Physics. 126
Autor:
Satonori Nozawa, Keisuke Hosokawa, Sota Nanjo, Tetsuya Kawabata, Masaki Yamamoto, Magnar Gullikstad Johnsen, Takuo T. Tsuda
Publikováno v:
Scientific reports. 12(1)
The activity of citizen scientists who capture images of aurora borealis using digital cameras has recently been contributing to research regarding space physics by professional scientists. Auroral images captured using digital cameras not only fasci