Zobrazeno 1 - 10
of 207
pro vyhledávání: '"Imada, Shinsuke"'
Autor:
Kurihara, Miki, Iwakiri, Wataru Buz, Tsujimoto, Masahiro, Ebisawa, Ken, Toriumi, Shin, Imada, Shinsuke, Tsuboi, Yohko, Usui, Kazuki, Gendreau, Keith C., Arzoumanian, Zaven
We detected a giant X-ray flare from the RS-CVn type binary star UX Ari using MAXI on 2020 August 17 and started a series of NICER observations 89 minutes later. For a week, the entire duration of the flare was covered with 32 snapshot observations i
Externí odkaz:
http://arxiv.org/abs/2403.12351
Autor:
Kawai, Toshiki, Imada, Shinsuke
We statistically estimate the conversion rate of the energy released during an active-region transient brightening to Doppler motion and thermal and non-thermal energies. We used two types of datasets for the energy estimation and detection of transi
Externí odkaz:
http://arxiv.org/abs/2106.06208
Autor:
Iijima, Haruhisa, Imada, Shinsuke
The transition region is a thin layer of the solar atmosphere that controls the energy loss from the solar corona. Large numbers of grid points are required to resolve this thin transition region fully in numerical modeling. In this study, we propose
Externí odkaz:
http://arxiv.org/abs/2106.00864
Publikováno v:
The Astrophysical Journal, 2021
In addition to regular Schwabe cycles (~ 11 years), solar activity also shows longer periods of enhanced or reduced activity. Of these, reconstructions of the Dalton Minimum provide controversial sunspot group numbers and limited sunspot positions, p
Externí odkaz:
http://arxiv.org/abs/2105.05405
Autor:
Kawai, Toshiki, Imada, Shinsuke
To understand the mechanism of coronal heating, it is crucial to derive the contribution of small-scale flares, the so-called nanoflares, to the heating up of the solar corona. To date, several studies have tried to derive the occurrence frequency di
Externí odkaz:
http://arxiv.org/abs/2011.06390
Autor:
Hayakawa, Hisashi, Iju, Tomoya, Uneme, Shoma, Besser, Bruno P., Kosaka, Shunsuke, Imada, Shinsuke
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2020
The solar activity during the Maunder Minimum (MM; 1645 -- 1715) has been considered significantly different from the one captured in modern observations, in terms of sunspot group number and sunspot positions, whereas its actual amplitudes and distr
Externí odkaz:
http://arxiv.org/abs/2009.14369
Autor:
Lee, Kyoung-Sun, Hara, Hirohisa, Watanabe, Kyoko, Joshi, Anand D., Brooks, David H., Imada, Shinsuke, Prasad, Avijeet, Dang, Phillip, Shimizu, Toshifumi, Savage, Sabrina L., Moore, Ronald, Panesar, Navdeep K., Reep, Jeffrey W.
We have investigated an M1.3 limb flare, which develops as a magnetic loop/arch that fans out from an X-ray jet. Using Hinode/EIS, we found that the temperature increases with height to a value of over 10$^{7}$ K at the loop-top during the flare. The
Externí odkaz:
http://arxiv.org/abs/2005.09875
In addition to X-rays, extreme ultraviolet (EUV) rays radiated from solar flares can cause serious problems, such as communication failures and satellite drag. Therefore, methods for forecasting EUV dynamic spectra during flares are urgently required
Externí odkaz:
http://arxiv.org/abs/2005.06099
The largest X9.3 solar flare in solar cycle 24 and the preceding X2.2 flare occurred on September 6, 2017, in the solar active region NOAA 12673. This study aims to understand the onset mechanism of these flares via analysis of multiple observational
Externí odkaz:
http://arxiv.org/abs/2005.00688
Autor:
Hayakawa, Hisashi, Besser, Bruno P., Iju, Tomoya, Arlt, Rainer, Uneme, Shoma, Imada, Shinsuke, Bourdin, Philippe-A., Kraml, Amand
Publikováno v:
The Astrophysical Journal, 2020
As we are heading towards the next solar cycle, presumably with a relatively small amplitude, it is of significant interest to reconstruct and describe the past grand minima on the basis of actual observations of the time. The Dalton Minimum is often
Externí odkaz:
http://arxiv.org/abs/2001.02367