Zobrazeno 1 - 10
of 220
pro vyhledávání: '"ISOBE, Hiroaki"'
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
The resonance lines of \ion{Si}{4} formed at $\lambda$1394 and 1403 {\AA} are the most critical for the diagnostics of the solar transition region in the observations of the Interface Region Imaging Spectrograph (IRIS). Studying the intensity ratios
Externí odkaz:
http://arxiv.org/abs/2004.04530
Autor:
Seki, Daikichi, Otsuji, Kenichi, Ishii, Takako T., Hirose, Kumi, Iju, Tomoya, UeNo, Satoru, Cabezas, Denis P., Asai, Ayumi, Isobe, Hiroaki, Ichimoto, Kiyoshi, Shibata, Kazunari
This paper describes a new SMART/SDDI Filament Disappearance Catalogue, in which we listed almost all the filament disappearance events that the Solar Dynamics Doppler Imager (SDDI) has observed since its installation on the Solar Magnetic Activity R
Externí odkaz:
http://arxiv.org/abs/2003.03454
Publikováno v:
In Acta Astronautica September 2023 210:36-44
The sun occasionally undergoes the so-called grand minima, in which its magnetic activity, measured by the number of sunspots, is suppressed for decades. The most prominent grand minima, since the beginning of telescopic observations of sunspots, is
Externí odkaz:
http://arxiv.org/abs/1903.08466
Autor:
Seki, Daikichi, Otsuji, Kenichi, Isobe, Hiroaki, Ishii, Takako T., Ichimoto, Kiyoshi, Shibata, Kazunari
Filaments, the dense cooler plasma floating in the solar corona supported by magnetic fields, generally exhibit certain activations before they erupt. In our previous study (Seki et al. 2017 ), we observed that the standard deviation of the line-of-s
Externí odkaz:
http://arxiv.org/abs/1902.08718
Autor:
Seki, Daikichi, Ueno, Satoru, Isobe, Hiroaki, Otsuji, Kenichi, Cabezas, Denis P., Ichimoto, Kiyoshi, Shibata, Kazunari, team, CHAIN
In this article, we insist on the importance and the challenges of the prediction of solar eruptive phenomena including flares, coronal mass ejections (CME), and filament eruptions fully based on the ground-based telescopes. It is true that satellite
Externí odkaz:
http://arxiv.org/abs/1808.06295
Autor:
Hayakawa, Hisashi, Ebihara, Yusuke, Vaquero, José M., Hattori, Kentaro, Carrasco, Víctor M. S., Gallego, María de la Cruz, Hayakawa, Satoshi, Watanabe, Yoshikazu, Iwahashi, Kiyomi, Tamazawa, Harufumi, Kawamura, Akito D., Isobe, Hiroaki
Publikováno v:
Astronomy & Astrophysics, 2018
Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magnetic storm occurred on February 15, 1730. We scale this magnetic storm
Externí odkaz:
http://arxiv.org/abs/1807.06496
Autor:
Hayakawa, Hisashi, Iwahashi, Kiyomi, Ebihara, Yusuke, Tamazawa, Harufumi, Shibata, Kazunari, Knipp, Delores J., Kawamura, Akito Davis, Hattori, Kentaro, Mase, Kumiko, Nakanishi, Ichiro, Isobe, Hiroaki
Dim red aurora at low magnetic latitudes is a visual and recognized manifestation of geomagnetic storms. The great low-latitude auroral displays seen throughout East Asia on 16-18 September 1770 are considered to manifest one of the greatest storms.
Externí odkaz:
http://arxiv.org/abs/1711.00690
Autor:
Hayakawa, Hisashi, Iwahashi, Kiyomi, Tamazawa, Harufumi, Ebihara, Yusuke, Kawamura, Akito Davis, Isobe, Hiroaki, Namiki, Katsuko, Shibata, Kazunari
In this article, we present the results of the surveys on sunspots and auroral candidates in Rikkokushi, Japanese Official Histories from the early 7th century to 887 to review the solar and auroral activities. In total, we found one sunspot record a
Externí odkaz:
http://arxiv.org/abs/1708.01045