52 citations · 153 across the 12 of their papers we have counts for
12 papers
M-dwarf's Chromosphere, Corona and Wind Connection via the Nonlinear Alfvén Wave
Takahito Sakaue, Kazunari Shibata
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…
Small-scale Turbulent Motion of the Plasma in a Solar Filament as the Precursor of Eruption
Daikichi Seki, Kenichi Otsuji, Hiroaki Isobe +5
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 demonstrate…
Nonlinear Alfvén Wave Model of Stellar Coronae and Winds from the Sun to M dwarfs
Takahito Sakaue, Kazunari Shibata
M dwarf's atmosphere and wind is expected to be highly magnetized. The nonlinear propagation of Alfvén wave could play a key role in both heating the stellar atmosphere and driving…
Energy Transfer by Nonlinear Alfvén Waves in the Solar Chromosphere, and Its Effect on Spicule Dynamics, Coronal Heating, and Solar Wind Acceleration
Takahito Sakaue, Kazunari Shibata
Alfvén 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 nonl…
Dynamic Processes of the Moreton Wave on 2014 March 29
Denis P. Cabezas, Ayumi Asai, Kiyoshi Ichimoto +4
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 eru…
Statistical Study of Solar White-light Flares and Comparison with Superflares on Solar-type Stars
Kosuke Namekata, Takahito Sakaue, Kyoko Watanabe +9
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 $…
Blue wing enhancement of the chromospheric Mg II h and k lines in a solar flare
Akiko Tei, Takahito Sakaue, Takenori J. Okamoto +6
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…
Statistical Studies of Solar White-Light Flares and Comparisons with Superflares on Solar-type Stars
Kosuke Namekata, Takahito Sakaue, Kyoko Watanabe +9
Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies () and duratio…
Observational Study on the Fine Structure and Dynamics of a Solar Jet. II. Energy Release Process Revealed by Spectral Analysis
Takahito Sakaue, Akiko Tei, Ayumi Asai +3
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) a…
Observational Study on the Fine Structure and Dynamics of a Solar Jet. I. Energy Build-Up Process around a Satellite Spot
Takahito Sakaue, Akiko Tei, Ayumi Asai +3
We report a solar jet phenomenon associated with successive flares on November 10th 2014. These explosive events were involved with the satellite spots' emergence around a delta-ty…
Increase in the amplitude of line-of-sight velocities of the small-scale motions in a solar filament before eruption
Daikichi Seki, Kenichi Otsuji, Hiroaki Isobe +3
We present a study on the evolution of the small scale velocity field in a solar filament as it approaches to the eruption. The observation was carried out by the Solar Dynamics Do…
Validation of a Scaling Law for the Coronal Magnetic Field Strengths and Loop Lengths of Solar and Stellar Flares
Kosuke Namekata, Takahito Sakaue, Kyoko Watanabe +2
Shibata & Yokoyama (1999, 2002) proposed a method of estimating the coronal magnetic field strengths () and magnetic loop lengths () of solar and stellar flares, on the basis…