Results 1 to 10 of about 17,719 (230)

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   +6 more sources

Solar–Stellar Connection: X-Ray Flares to Energetic (E > 10 MeV) Particle Events

The Astrophysical Journal, 2023
Energetic particle environments are an important factor for the viability of life on exoplanets surrounding flare stars. In the heliosphere, large gradual solar energetic ( E > 10 MeV) particle (SEP) events are produced by shocks from fast coronal mass ...
S. W. Kahler, A. G. Ling
doaj   +2 more sources

The Soft X-ray Lightcurves of Partially Eclipsed Stellar Flares [PDF]

Monthly Notices of the Royal Astronomical Society, 2011
Most stellar flares' soft X-ray lightcurves possess a `typical' morphology, which consists of a rapid rise followed by a slow exponential decay. However, a study of 216 of the brightest flares on 161 pre-main sequence stars, observed during the Chandra ...
Alencar, Antiochos, Aschwanden, Benz, Brown, Browning, C. P. Johnstone, Collier Cameron, Dunstone, Favata, Feigelson, Getman, Getman, Getman, Getman, Getman, Ilgner, K. V. Getman, Lin, López-Santiago, M. M. Jardine, Mullan, Neupert, Pandey, Pillitteri, Reale, Reale, S. G. Gregory, Sanz-Forcada, Sanz-Forcada, Schmitt, Schmitt, Skinner, Stelzer   +33 more
core   +7 more sources

A Systematic Study of X-Ray Flares from Low-Mass Young Stellar Objects in the $\rho$ Ophiuchi Star-Forming Region with Chandra [PDF]

Publication of the Astronomical Society of Japan, 2003
We report on the results of a systematic study of X-ray flares from low-mass young stellar objects, using Chandra observations of the main region of the Rho Oph.
Kensuke Imanishi, Hiroshi Nakajima, Masahiro Tsujimoto   +2 more
exaly   +3 more sources

Stellar flares

Living Reviews in Solar Physics
Magnetic storms on stars manifest as remarkable, randomly occurring changes of the luminosity over durations that are tiny in comparison to the normal evolution of stars.
Adam F. Kowalski
doaj   +2 more sources

Effect of Time-varying X-Ray Emission from Stellar Flares on the Ionization of Protoplanetary Disks

The Astrophysical Journal
X-rays have significant impacts on cold, weakly ionized protoplanetary disks by increasing the ionization rate and driving chemical reactions. Stellar flares are explosions that emit intense X-rays and are the unique source of hard X-rays with an energy ...
Haruka Washinoue, Shinsuke Takasao, Kenji Furuya   +2 more
doaj   +4 more sources

Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF): X-Ray-flare-related Phenomena and Multi-epoch Behavior

The Astrophysical Journal
The most powerful stellar flares driven by magnetic energy occur during the early pre-main-sequence (PMS) phase. The Orion Nebula represents the nearest region populated by young stars, showing the greatest number of flares accessible to a single ...
Konstantin V. Getman, Eric D. Feigelson, Abygail R. Waggoner, L. Ilsedore Cleeves, Jan Forbrich, Joe P. Ninan, Oleg Kochukhov, Vladimir S. Airapetian, Sergio A. Dzib, Charles J. Law, Christian Rab   +10 more
doaj   +6 more sources

LEIA Discovery of the Longest-lasting and Most Energetic Stellar X-Ray Flare Ever Detected

The Astrophysical Journal
The Lobster Eye Imager for Astronomy (LEIA) detected a new X-ray transient on 2022 November 7, identified as a superflare event occurring on a nearby K-type giant star HD 251108. The flux increase was also detected in follow-up observations at X-ray, UV,
Xuan Mao, He-Yang Liu, Song Wang, Zhixing Ling, Weimin Yuan, Huaqing Cheng, Haiwu Pan, Dongyue Li, Fabio Favata, Tuo Ji, Jujia Zhang, Xinlin Zhao, Jing Wang, Mingjun Liu, Yuan Liu, Zhiming Cai, Alberto J. Castro-Tirado, Yanfeng Dai, Licai Deng, Xu Ding, Kaifan Ji, Chichuan Jin, Yajuan Lei, Huali Li, Jun Lin, Huaqiu Liu, Shuai Liu, Hui Sun, Shengli Sun, Xiaojin Sun, Jianrong Shi, Jianguo Wang, Jingxiu Wang, Wenxin Wang, Jianyan Wei, Liping Xin, Dingrong Xiong, Chen Zhang, Wenda Zhang, Yonghe Zhang, Xiaofeng Zhang, Donghua Zhao, Guiping Zhou   +42 more
doaj   +4 more sources

Geometry Diagnostics of a Stellar Flare from Fluorescent X-Rays [PDF]

The Astrophysical Journal, 2008
accepted for publication on the Astrophysical Journal ...
TESTA, Paola, DRAKE J. J, ERCOLANO B, REALE, Fabio, HUENEMOERDER D. P, AFFER L, MICELA G, GARCIA ALVAREZ D.   +7 more
openaire   +3 more sources

A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect

The Astrophysical Journal, 2023
We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on 73 unique flares between the X-ray to optical data.
Isaiah I. Tristan, Yuta Notsu, Adam F. Kowalski, Alexander Brown, John P. Wisniewski, Rachel A. Osten, Eliot H. Vrijmoet, Graeme L. White, Brad D. Carter, Carol A. Grady, Todd J. Henry, Rodrigo H. Hinojosa, Jamie R. Lomax, James E. Neff, Leonardo A. Paredes, Jack Soutter   +15 more
doaj   +1 more source