Author:
Drake Jeremy J.,Cohen Ofer,Garraffo Cecilia,Kashyap V.
Abstract
AbstractFlares we observe on stars in white light, UV or soft X-rays are probably harbingers of coronal mass ejections (CMEs). If we use the Sun as a guide, large stellar flares will dissipate two orders of magnitude less X-ray radiative energy than the kinetic energy in the associated CME. Since coronal emission on active stars appears to be dominated by flare activity, CMEs pose a quandary for understanding the fraction of their energy budget stars can spend on magnetic activity. One answer is magnetic suppression of CMEs, in which the strong large-scale fields of active stars entrap and prevent CMEs unless their free energy exceeds a critical value. The CME-less flaring active region NOAA 2192 presents a possible solar analogue of this. Monster CMEs will still exist, and have the potential to ravage planetary atmospheres.
Publisher
Cambridge University Press (CUP)
Subject
Astronomy and Astrophysics,Space and Planetary Science
Reference17 articles.
1. Yashiro S. & Gopalswamy N. 2009, in IAU Symposium, Vol. 257, IAU Symposium, ed. N. Gopalswamy & D. F. Webb , 233–243
2. THE STELLAR-ACTIVITY-ROTATION RELATIONSHIP AND THE EVOLUTION OF STELLAR DYNAMOS
3. Favata F. 2002, in Astronomical Society of the Pacific Conference Series, Vol. 277, Stellar Coronae in the Chandra and XMM-NEWTON Era, ed. F. Favata & J. J. Drake , 115
4. Limits to Mass Outflows from Late-Type Dwarf Stars
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