Zobrazeno 1 - 10
of 112
pro vyhledávání: '"Daikou P."'
Autor:
Hayakawa, Hisashi, Ebihara, Yusuke, Mishev, Alexander, Koldobskiy, Sergey, Kusano, Kanya, Bechet, Sabrina, Yashiro, Seiji, Iwai, Kazumasa, Shinbori, Atsuki, Mursula, Kalevi, Miyake, Fusa, Shiota, Daikou, Silveira, Marcos V. D., Stuart, Robert, Oliveira, Denny M., Akiyama, Sachiko, Ohnishi, Kouji, Miyoshi, Yoshizumi
In May 2024, the scientific community observed intense solar eruptions that resulted in an extreme geomagnetic storm and auroral extension, highlighting the need to document and quantify these events. This study mainly focuses on their quantification
Externí odkaz:
http://arxiv.org/abs/2407.07665
Autor:
Iwai, Kazumasa, Fallows, Richard A., Bisi, Mario M., Shiota, Daikou, Jackson, Bernard V., Tokumaru, Munetoshi, Fujiki, Ken'ichi
Interplanetary scintillation (IPS) is a useful tool for detecting coronal mass ejections (CMEs) throughout interplanetary space. Global magnetohydrodynamic (MHD) simulations of the heliosphere, which are usually used to predict the arrival and geo-ef
Externí odkaz:
http://arxiv.org/abs/2209.12486
Understanding the mechanism(s) of the solar wind acceleration is important in astrophysics and geophysics. A promising model of the solar wind acceleration is known as the wave/turbulence-driven (WTD) model, in which Alfv\'en waves feed energy to the
Externí odkaz:
http://arxiv.org/abs/2202.10768
Autor:
Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Kenichi, Den, Mitsue, Kubo, Yûki
Coronal mass ejections (CMEs) cause various disturbances of the space environment; therefore, forecasting their arrival time is very important. However, forecasting accuracy is hindered by limited CME observations in interplanetary space. This study
Externí odkaz:
http://arxiv.org/abs/2012.12635
Autor:
Numazawa, Masaki, Ezoe, Yuichiro, Ohashi, Takaya, Ishikawa, Kumi, Miyoshi, Yoshizumi, Kimura, Tomoki, Uchiyama, Yasunobu, Shiota, Daikou, Branduardi-Raymont, Graziella
We report on results of imaging and spectral studies of X-ray emission from Jupiter observed by Suzaku. In 2006 Suzaku had found diffuse X-ray emission in $1\unicode{x2013}5$ keV associated with Jovian inner radiation belts. It has been suggested tha
Externí odkaz:
http://arxiv.org/abs/1906.06123
Autor:
Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Kenichi, Den, Mitsue, Kubo, Yûki
Coronal mass ejections (CMEs) cause disturbances in the environment of the Earth when they arrive at the Earth. However, the prediction of the arrival of CMEs still remains a challenge. We have developed an interplanetary scintillation (IPS) estimati
Externí odkaz:
http://arxiv.org/abs/1903.11769
On SOL2017-09-06 solar active region 12673 produced an X9.3 flare which is regarded as largest to occur in solar cycle 24. In this work we have preformed a magnetohydrodynamic (MHD) simulation in order to reveal the three-dimensional (3D) dynamics of
Externí odkaz:
http://arxiv.org/abs/1809.02309
Autor:
Anan, Tetsu, Yoneya, Takurou, Ichimoto, Kiyoshi, Ueno, Satoru, Shiota, Daikou, Nozawa, Satoshi, Takasao, Shinsuke, Kawate, Tomoko
A flare kernel associated with a C4 class flare was observed in a spectral window including the He I triplet 10830 A and Si I 10827 A with a spectropolarimeter on the Domeless Solar Telescope at Hida Observatory on August 9th, 2015. Observed Stokes p
Externí odkaz:
http://arxiv.org/abs/1808.06821
In order to understand the flare trigger mechanism, we conducted three-dimensional magnetohydrodynamic simulations using a coronal magnetic field model derived from data observed by the Hinode satellite. Several types of magnetic bipoles were imposed
Externí odkaz:
http://arxiv.org/abs/1706.07153
Publikováno v:
The Astrophysical Journal, 838:134 (16pp), 2017 April 1
The solar magnetic field in a flare-producing active region (AR) is much more complicated than theoretical models, which assume a very simple magnetic field structure. The X1.0 flare, which occurred in AR 12192 on 2014 October 25, showed a complicate
Externí odkaz:
http://arxiv.org/abs/1704.00877