Observational Evidence of Gentle Chromospheric Evaporation during the Impulsive Phase of a Solar Flare | Zendy

Ryan O. Milligan | Zendy; P. T. Gallagher | Zendy; M. Mathioudakis | Zendy; F. P. Keenan | Zendy

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Observational Evidence of Gentle Chromospheric Evaporation during the Impulsive Phase of a Solar Flare

Author(s) -

Ryan O. Milligan,

P. T. Gallagher,

M. Mathioudakis,

F. P. Keenan

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/504592

Subject(s) - physics , solar flare , flare , astrophysics , observatory , coronal mass ejection , solar observatory , flux (metallurgy) , astronomy , plasma , evaporation , solar wind , meteorology , materials science , magnetic field , nuclear physics , quantum mechanics , metallurgy

Observational evidence for gentle chromospheric evaporation during theimpulsive phase of a C9.1 solar flare is presented using data from the ReuvenRamaty High-Energy Solar Spectroscopic Imager and the Coronal DiagnosticSpectrometer on board the Solar and Heliospheric Observatory. Until now,evidence for gentle evaporation has often been reported during the decay phaseof solar flares, where thermal conduction is thought to be the drivingmechanism. Here we show that the chromospheric response to a low flux ofnonthermal electrons (>=5x10^9 ergs cm^-2 s^-1) results in plasma upflows of13+/-16, 16+/-18, and 110+/-58 km s^-1 in the cool He I and O V emission linesand the 8 MK Fe XIX line. These findings, in conjunction with other recentlyreported work, now confirm that the dynamic response of the solar atmosphere issensitively dependent on the flux of incident electrons.Comment: 5 page

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