Results 1 to 10 of about 152,015 (264)

Probability Distribution Functions of Solar and Stellar Flares [PDF]

Physics, 2022
The paper studies the soft X-ray data of solar flares and found that the distribution functions of flare fluence are successfully modeled by tapered power law or gamma function distributions whose power exponent is slightly smaller than 2, indicating ...
Takashi Sakurai
doaj   +2 more sources

Scaling laws of solar and stellar flares [PDF]

, 2007
In this study we compile for the first time comprehensive data sets of solar and stellar flare parameters, including flare peak temperatures T_p, flare peak volume emission measures EM_p, and flare durations t_f from both solar and stellar data, as well as flare length scales L from solar data.
Doyle J. G., Jakimiec J., Maggio A., Manuel Gudel, Markus J. Aschwanden, Mewe R., Pan H. C., Robert A. Stern, Shimizu T., Tsuru T.   +9 more
arxiv   +3 more sources

Gamma-Ray Polarimetry of Two X-Class Solar Flares [PDF]

Astrophys.J.638:1129-1139,2006, 2005
We have performed the first polarimetry of solar flare emission at gamma-ray energies (0.2-1 MeV). These observations were performed with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) for two large flares: the GOES X4.8-class solar flare of 2002 July 23, and the X17-class flare of 2003 October 28.
Charikov Ju. E., E. Kalemci, Korchak A. A., Lei F., Novick R., Steven E. Boggs, W. Coburn, Zharkova V. V.   +7 more
arxiv   +4 more sources

Verification of operational solar flare forecast: Case of Regional Warning Center Japan [PDF]

Journal of Space Weather and Space Climate, 2017
In this article, we discuss a verification study of an operational solar flare forecast in the Regional Warning Center (RWC) Japan. The RWC Japan has been issuing four-categorical deterministic solar flare forecasts for a long time.
Kubo Yûki, Den Mitsue, Ishii Mamoru
doaj   +3 more sources

Unprecedented Fine Structure of a Solar Flare Revealed by the 1.6 m New Solar Telescope. [PDF]

Sci Rep, 2016
Solar flares signify the sudden release of magnetic energy and are sources of so called space weather. The fine structures (below 500 km) of flares are rarely observed and are accessible to only a few instruments world-wide.
Jing J, Xu Y, Cao W, Liu C, Gary D, Wang H.   +5 more
europepmc   +2 more sources

Properties of Flares-Generated Seismic Waves on the Sun [PDF]

, 2005
The solar seismic waves excited by solar flares (``sunquakes'') are observed as circular expanding waves on the Sun's surface. The first sunquake was observed for a flare of July 9, 1996, from the Solar and Heliospheric Observatory (SOHO) space mission.
A. G. Kosovichev, A.-C. Donea, A.-C. Donea, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, C.L. Wolff, D.C. Braun, G.H. Fisher, G.J. Hurford, G.J. Hurford, J.J. Podesta, J.J. Podesta, K. Shibata, M. Medrek, M.A. Livshits, N.D. Kostiuk, P.A. Sturrock, P.H. Scherrer, T.E. Abdelatif, T.L. Duvall Jr., Z. Svestka   +23 more
arxiv   +3 more sources

The NWRA Classification Infrastructure: description and extension to the Discriminant Analysis Flare Forecasting System (DAFFS)

Journal of Space Weather and Space Climate, 2018
A classification infrastructure built upon Discriminant Analysis (DA) has been developed at NorthWest Research Associates for examining the statistical differences between samples of two known populations.
Leka K.D., Barnes Graham, Wagner Eric
doaj   +2 more sources

Mars Upper Atmospheric Responses to the 10 September 2017 Solar Flare: A Global, Time‐Dependent Simulation [PDF]

Geophysical Research Letters, 2019
We report the first global, time‐dependent simulation of the Mars upper atmospheric responses to a realistic solar flare event, an X8.2 eruption on 10 September 2017.
Xiaohua Fang, David Pawlowski, Yingjuan Ma, Stephen Bougher, Edward Thiemann, Francis Eparvier, Wenbin Wang, Chuanfei Dong, Christina O. Lee, Yaxue Dong, Mehdi Benna, Meredith Elrod, Phillip Chamberlin, Paul Mahaffy, Bruce Jakosky   +14 more
doaj   +2 more sources

No Evidence Supporting Flare Driven High-Frequency Global Oscillations [PDF]

, 2012
The underlying physics that generates the excitations in the global low-frequency, < 5.3 mHz, solar acoustic power spectrum is a well known process that is attributed to solar convection; However, a definitive explanation as to what causes excitations in the high-frequency regime, > 5.3 mHz, has yet to be found. Karoff and Kjeldsen (Astrophys. J.
A. Ambastha, A.C. Donea, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, B. Kumar, B. Kumar, B. Kumar, B. Kumar, C. Karoff, C.L. Wolff, D.A. Haber, D.C. Braun, F. Hill, F. Hill, J.R. Kennedy, J.R. Kennedy, K. G. Stassun, M. Richardson, R. Howe, R.W. Komm, S. Chakraborty, T. Foglizzo, V.G. Gavryusev   +23 more
arxiv   +3 more sources

Observation of a reversal of rotation in a sunspot during a solar flare [PDF]

Nature Communications, 2016
Back reaction of coronal magnetic fields on the solar surface may help to understand the coronal reconfiguration during a solar flare. Here the authors report observation of reversal of the rotation of a sunspot during a X1.6 flare with data from HMI.
Yi Bi, Yunchun Jiang, Jiayan Yang, Junchao Hong, Haidong Li, Bo Yang, Zhe Xu   +6 more
doaj   +2 more sources