Observational evidence of gentle chromospheric evaporation during the impulsive phase of a solar flare

Francis Keenan, Michail Mathioudakis, R.O. Milligan, P.T. Gallagher

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Observational evidence of gentle chromospheric evaporation during the impulsive phase of a C9.1 solar flare is presented using data from the Reuven Ramaty High-Energy Solar Spectroscopic Imager and the Coronal Diagnostic Spectrometer on board the Solar and Heliospheric Observatory. Until now, evidence of gentle evaporation has often been reported during the decay phase of solar flares, where thermal conduction is thought to be the driving mechanism. Here we show that the chromospheric response to a low flux of nonthermal electrons (>= 5 cm(-2) s(-1)) results in plasma upflows of 13 +/- 16, 16 +/- 18, and 110 +/- 58 km s(-1) in the cool He I and O V emission lines and the 8 MK Fe XIX line, respectively. These findings, in conjunction with other recently reported work, now confirm that the dynamic response of the solar atmosphere is sensitively dependent on the flux of incident electrons.
Original languageEnglish
Pages (from-to)L169-L171
Number of pages3
JournalAstrophysical Journal
Volume642
Issue number2 II
DOIs
Publication statusPublished - 10 May 2006

Keywords

  • Sun: Atmospheric Motions
  • Sun: Flares
  • Sun: UV Radiation
  • Sun: X-Rays
  • Gamma Rays
  • Astrophysics

ASJC Scopus subject areas

  • Space and Planetary Science

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