Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Sakaue, Takahito"'
Nonlinear Alfvén Wave Model for Solar/Stellar Chromosphere, Corona and Wind from the Sun to M Dwarfs
Autor:
Sakaue, Takahito
甲第23011号
理博第4688号
新制||理||1672(附属図書館)
学位規則第4条第1項該当
Doctor of Science
Kyoto University
DFAM
理博第4688号
新制||理||1672(附属図書館)
学位規則第4条第1項該当
Doctor of Science
Kyoto University
DFAM
Externí odkaz:
http://hdl.handle.net/2433/263472
Autor:
Sakaue, Takahito, Shibata, Kazunari
M dwarf's atmosphere is expected to be highly magnetized. The magnetic energy can be responsible for heating the stellar chromosphere and corona, and driving the stellar wind. The nonlinear propagation of Alfv\'en wave is the promising mechanism for
Externí odkaz:
http://arxiv.org/abs/2106.12752
Autor:
Seki, Daikichi, Otsuji, Kenichi, Isobe, Hiroaki, Del Zanna, Giulio, Ishii, Takako T., Sakaue, Takahito, Ichimoto, Kiyoshi, Shibata, Kazunari
A filament, a dense cool plasma supported by the magnetic fields in the solar corona, often becomes unstable and erupts. It is empirically known that the filament often demonstrates some activations such as a turbulent motion prior to eruption. In ou
Externí odkaz:
http://arxiv.org/abs/2106.11875
Autor:
Sakaue, Takahito, Shibata, Kazunari
M dwarf's atmosphere and wind is expected to be highly magnetized. The nonlinear propagation of Alfv\'en wave could play a key role in both heating the stellar atmosphere and driving the stellar wind. Along this Alfv\'en wave scenario, we carried out
Externí odkaz:
http://arxiv.org/abs/2012.10868
Autor:
Sakaue, Takahito, Shibata, Kazunari
Alfv\'en waves are responsible for the transfer of magnetic energy in the magnetized plasma. They are involved in heating solar atmosphere and driving solar wind through various nonlinear processes. Since the magnetic field configurations directly af
Externí odkaz:
http://arxiv.org/abs/2008.00643
Autor:
Cabezas, Denis P., Asai, Ayumi, Ichimoto, Kiyoshi, Sakaue, Takahito, UeNo, Satoru, Ishitsuka, Jose K., Shibata, Kazunari
On 2014 March 29, an intense solar flare classified as X1.0 occurred in the active region 12017. Several associated phenomena accompanied this event, among them a fast-filament eruption, large-scale propagating disturbances in the corona and the chro
Externí odkaz:
http://arxiv.org/abs/1908.03534
Autor:
Namekata, Kosuke, Sakaue, Takahito, Watanabe, Kyoko, Asai, Ayumi, Maehara, Hiroyuki, Notsu, Yuta, Notsu, Shota, Honda, Satoshi, Ishii, Takako T., Ikuta, Kai, Nogami, Daisaku, Shibata, Kazunari
Recently, many superflares on solar-type stars were discovered as white-light flares (WLFs). A correlation between the energies (E) and durations (t) of superflares is derived as $t\propto E^{0.39}$, and this can be theoretically explained by magneti
Externí odkaz:
http://arxiv.org/abs/1804.07122
Autor:
Tei, Akiko, Sakaue, Takahito, Okamoto, Takenori J., Kawate, Tomoko, Heinzel, Petr, Ueno, Satoru, Asai, Ayumi, Ichimoto, Kiyoshi, Shibata, Kazunari
We performed coordinated observations of AR 12205, which produced a C-class flare on 2014 November 11, with the Interface Region Imaging Spectrograph (IRIS) and the Domeless Solar Telescope (DST) at Hida Observatory. Using spectral data in the Si IV
Externí odkaz:
http://arxiv.org/abs/1803.05237
Statistical Studies of Solar White-Light Flares and Comparisons with Superflares on Solar-type Stars
Autor:
Namekata, Kosuke, Sakaue, Takahito, Watanabe, Kyoko, Asai, Ayumi, Maehara, Hiroyuki, Notsu, Yuta, Notsu, Shota, Honda, Satoshi, Ishii, Takako, Ikuta, Kai, Nogami, Daisaku, Shibata, Kazunari
Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies ($E$) and durations ($\tau$): $\tau \propto E^{0.39}$ (Maehara et al. 2017 $EP\& S$, 67
Externí odkaz:
http://arxiv.org/abs/1710.11325
Autor:
Sakaue, Takahito, Tei, Akiko, Asai, Ayumi, Ueno, Satoru, Ichimoto, Kiyoshi, Shibata, Kazunari
We report a solar jet phenomenon associated with the C5.4 class flare on 2014 November 11. The data of jet was provided by Solar Dynamics Observatory (SDO), X-Ray Telescope (XRT) aboard Hinode, Interface Region Imaging Spectrograph (IRIS) and Domeles
Externí odkaz:
http://arxiv.org/abs/1710.08441