Zobrazeno 1 - 10
of 674
pro vyhledávání: '"Shibata, Kazunari"'
A fast-filament eruption observed in the H$\alpha$ spectral line. I. Imaging spectroscopy diagnostic
Autor:
Cabezas, Denis P., Ichimoto, Kiyoshi, Asai, Ayumi, UeNo, Satoru, Morita, Satoshi, Otsuji, Ken-ichi, Shibata, Kazunari
Context. Solar filament eruptions usually appear to occur in association with the sudden explosive release of magnetic energy accumulated in long-lived arched magnetic structures. It is the released energy that occasionally drives fast-filament erupt
Externí odkaz:
http://arxiv.org/abs/2406.20020
Space-based observations show that the solar atmosphere from the solar chromosphere to the solar corona is filled with small-scale jets and is linked with small-scale explosions. These jets may be produced by mechanisms similar to that of large-scale
Externí odkaz:
http://arxiv.org/abs/2401.16319
Autor:
Ikuta, Kai, Shibata, Kazunari
Flares are intense explosions on the solar and stellar surfaces, and solar flares are sometimes accompanied by filament or prominence eruptions. Recently, a large filament eruption associated with a superflare on a solar-type star EK Dra was discover
Externí odkaz:
http://arxiv.org/abs/2401.04279
Autor:
Inoue, Shun, Enoto, Teruaki, Namekata, Kosuke, Notsu, Yuta, Honda, Satoshi, Maehara, Hiroyuki, Zhang, Jiale, Lu, Hong-Peng, Uchida, Hiroyuki, Tsuru, Takeshi Go, Nogami, Daisaku, Shibata, Kazunari
We conducted 4-night multiwavelength observations of an active M-dwarf star EV Lac on 2022 October 24$-$27 with simultaneous coverage of soft X-rays (NICER; 0.2$-$12 $\mathrm{keV}$, Swift XRT; 0.2$-$10 $\mathrm{keV}$), near-ultraviolet (Swift UVOT/UV
Externí odkaz:
http://arxiv.org/abs/2401.00399
Autor:
Namekata, Kosuke, Airapetian, Vladimir S., Petit, Pascal, Maehara, Hiroyuki, Ikuta, Kai, Inoue, Shun, Notsu, Yuta, Paudel, Rishi R., Arzoumanian, Zaven, Avramova-Boncheva, Antoaneta A., Gendreau, Keith, Jeffers, Sandra V., Marsden, Stephen, Morin, Julien, Neiner, Coralie, Vidotto, Aline A., Shibata, Kazunari
Young solar-type stars frequently produce superflares, serving as a unique window into the young Sun-Earth environments. Large solar flares are closely linked to coronal mass ejections (CMEs) associated with filament/prominence eruptions, but its obs
Externí odkaz:
http://arxiv.org/abs/2311.07380
Autor:
Notsu, Yuta, Kowalski, Adam F., Maehara, Hiroyuki, Namekata, Kosuke, Hamaguchi, Kenji, Enoto, Teruaki, Tristan, Isaiah I., Hawley, Suzanne L., Davenport, James R. A., Honda, Satoshi, Ikuta, Kai, Inoue, Shun, Namizaki, Keiichi, Nogami, Daisaku, Shibata, Kazunari
We conducted the time-resolved simultaneous optical spectroscopic and photometric observations of mid M dwarf flare stars YZ CMi, EV Lac, and AD Leo. Spectroscopic observations were obtained using Apache Point Observatory 3.5m and Small \& Moderate A
Externí odkaz:
http://arxiv.org/abs/2310.02450
Autor:
Kotani, Yuji, Ishii, Takako T., Yamasaki, Daiki, Otsuji, Kenichi, Ichimoto, Kiyoshi, Asai, Ayumi, Shibata, Kazunari
Small flares frequently occur in the quiet Sun. Previous studies have noted that they share many common characteristics with typical solar flares in active regions. However, their similarities and differences are not fully understood, especially thei
Externí odkaz:
http://arxiv.org/abs/2304.12037
Autor:
Ikuta, Kai, Namekata, Kosuke, Notsu, Yuta, Maehara, Hiroyuki, Okamoto, Soshi, Honda, Satoshi, Nogami, Daisaku, Shibata, Kazunari
Starspots and stellar flares are indicators of stellar magnetic activity.The magnetic energy stored around spots is thought to be the origin of flares, but the connection is not completely understood. To investigate the relation between spot location
Externí odkaz:
http://arxiv.org/abs/2302.09249
Autor:
Namizaki, Keiichi, Namekata, Kosuke, Maehara, Hiroyuki, Notsu, Yuta, Honda, Satoshi, Nogami, Daisaku, Shibata, Kazunari
Active M-type stars are known to often produce superflares on the surface. Radiation from stellar (super-)flares is important for the exoplanet habitability, but the mechanisms are not well understood. In this paper, we report simultaneous optical sp
Externí odkaz:
http://arxiv.org/abs/2302.03007
Autor:
Inoue, Shun, Maehara, Hiroyuki, Notsu, Yuta, Namekata, Kosuke, Honda, Satoshi, Namizaki, Keiichi, Nogami, Daisaku, Shibata, Kazunari
Stellar coronal mass ejections (CMEs) have recently received much attention for their impacts on exoplanets and stellar evolution. Detecting prominence eruptions, the initial phase of CMEs, as the blue-shifted excess component of Balmer lines is a te
Externí odkaz:
http://arxiv.org/abs/2301.13453