Results 41 to 50 of about 27,428 (205)

Using Support Vector Machine (SVM) and Ionospheric Total Electron Content (TEC) Data for Solar Flare Predictions

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
Predicting where and when space weather events such as solar flares and X-rays bursts are likely to occur in a specific area of interest constitutes a significant challenge in space weather research.
Saed Asaly, Lee-Ad Gottlieb, Yuval Reuveni   +2 more
doaj   +1 more source

Solar Radio Bursts with Spectral Fine Structures in Preflares [PDF]

, 2014
A good observation of preflare activities is important for us to understand the origin and triggering mechanism of solar flares, and to predict the occurrence of solar flares.
Huang, Jing, Karlický, Marian, Mészárosová, Hana, Simões, Paulo, Tan, Baolin, Tan, Chengming, Zhang, Yin   +6 more
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High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares

The Astrophysical Journal, 1982
Doschek et al. (1980) and Feldman et al. (1980) have discussed high-resolution soft X-ray spectra of solar flares. The present investigation is concerned with the characteristics of the impulsive events as observed in soft X rays and the cooling of the flare plasma in terms of energy loss processes.
U. Feldman, G. A. Doschek, R. W. Kreplin
openaire   +1 more source

X-ray Flaring Activity of Mrk 421 [PDF]

, 2004
We report results from a systematic search for X-ray flares from Mrk 421, using archival data from the Rossi X-ray Timing Explorer (RXTE) satellite. The flares are clearly seen over a wide range of timescales.
Cui, Wei
core   +3 more sources

Size dependence of solar X-ray flare properties [PDF]

Astronomy & Astrophysics, 2005
Non-thermal and thermal parameters of 85 solar flares of GOES class B1 to M6 (background subtracted classes A1 to M6) have been compared to each other. The hard X-ray flux has been measured by RHESSI and a spectral fitting provided flux and spectral index of the non-thermal emission, as well as temperature and emission measure of the thermal emission ...
Battaglia, Marina, Grigis, Paolo C., Benz, Arnold O.   +2 more
openaire   +2 more sources

Survey on solar X-ray flares and associated coherent radio emissions

, 2004
The radio emission during 201 X-ray selected solar flares was surveyed from 100 MHz to 4 GHz with the Phoenix-2 spectrometer of ETH Zurich. The selection includes all RHESSI flares larger than C5.0 jointly observed from launch until June 30, 2003 ...
A. O. Benz, A. O. Benz, A. O. Benz, A. O. Benz, AndrÉ Csillaghy, Arnold O. Benz, B. Kliem, B. R. Dennis, D. J. McLean, D. M. Smith, D. Maia, F. Fárník, G. Bruggmann, G. M. Simnett, H. Isliker, H. J. Smith, H. Zirin, J. I. Khan, J. P. Raulin, K. Jiřička, M. A. F. Allaart, M. E. Machado, M. Güdel, M. Güdel, M. J. Aschwanden, M. J. Aschwanden, M. J. Aschwanden, P. Lantos, P. Messmer, P. Saint-Hilaire, P. Saint-Hilaire, Paolo C. Grigis, Pascal Saint-Hilaire, R. A. Schwartz, R. F. Willson, R. P. Lin, S. R. Kane, S. W. Kahler, T. Kosugi, T. S. Bastian   +39 more
core   +1 more source

Multi-observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence for Abnormally Strong Stellar Magnetic Fields after Powerful X-Ray Flares

The Astrophysical Journal
We explore the empirical power-law relationship between X-ray luminosity ( L _X ) and total surface magnetic flux (Φ), established across solar magnetic elements, time- and disk-averaged emission from the Sun, older active stars, and pre-main-sequence ...
Konstantin V. Getman, Oleg Kochukhov, Joe P. Ninan, Eric D. Feigelson, Vladimir S. Airapetian, Abygail R. Waggoner, L. Ilsedore Cleeves, Jan Forbrich, Sergio A. Dzib, Charles J. Law, Christian Rab, Daniel M. Krolikowski   +11 more
doaj   +1 more source

Can we detect X/M/C-class solar flares from global navigation satellite system data?

Results in Physics, 2019
Based on the total electron content (TEC) data from global navigation satellite system (GNSS), we analyzed 224 classified solar flares (SFs) occurred in 2014–2017. We suggest an algorithm for SF automatic detection.
Semen V. Syrovatskiy, Yury V. Yasyukevich, Ilya K. Edemskiy, Artem M. Vesnin, Sergey V. Voeykov, Ilya V. Zhivetiev   +5 more
doaj   +1 more source

Intense Hard X-Ray Emissions in C-class Flares: A Statistical Study with ASO-S/HXI Data

The Astrophysical Journal Letters
In the standard model of solar eruptive events, coronal mass ejections (CMEs) and flares are associated with each other through magnetic reconnection initiated by erupting flux ropes.
Changxue Chen, Yang Su, Wei Chen, Jingwei Li, Fu Yu, Weiqun Gan   +5 more
doaj   +1 more source

New classification parameter of solar flares based on the maximum flux in soft X-rays and on duration of flare

, 2020
Solar flare activity is characterised by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the ...
Bruevich, Elena
core