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BEGIN:VEVENT
DTSTAMP:20260615T112708Z
DTSTART;VALUE=DATE-TIME:20200610T153000
DTEND;VALUE=DATE-TIME:20200610T163000
SUMMARY:Alexey Kuznetsov (ISTP Irkutsk): Stellar superflares observed sim
 ultaneously with Kepler and XMM-Newton
TZID:Europe/London
UID:20200610-8a17841a71bb9e7701721258f03b11cd@warwick.ac.uk
CREATED:20200514T094103Z
DESCRIPTION:Talk abstract: Solar and stellar flares are caused by catastr
 ophic release of magnetic energy stored in the corona\, which results in
  plasma heating\, particle acceleration and intense radiation across the
  electromagnetic spectrum. Multiwavelength observations are highly impor
 tant for understanding the nature of flares\, because different flare-re
 lated physical processes reveal themselves in different spectral ranges.
  While the Sun is routinely monitored by many instruments at various wav
 elengths\, multiwavelength observations of stellar flares are far less c
 ommon. To study the correlation between thermal and nonthermal processes
  in stellar flares\, we searched the databases of Kepler (optical observ
 ations) and XMM-Newton (soft X-rays) for the flares observed simultaneou
 sly with both instruments\; eight distinctive flares (with the energies 
 exceeding 1032 erg) on three stars (of K-M spectral classes) have been f
 ound. We analyze and compare the flare parameters (released energy and r
 ise and decay times) in the optical and X-ray spectral ranges\; we also 
 analyze the electron spectra inferred from the X-ray observations. On av
 erage\, stellar superflares look like scaled-up versions of solar flares
 \, which indicates the same underlying mechanism. At the same time\, lik
 e in the solar flares\, there are significant variations from flare to f
 lare\, including variations of the thermal-to-nonthermal emission ratio.
 
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20200514T094103Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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