TRACEandYohkohObservations of a White‐Light Flare | Zendy

Thomas R. Metcalf | Zendy; D. M. Alexander | Zendy; H. S. Hudson | Zendy; D. W. Longcope | Zendy

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TRACEandYohkohObservations of a White‐Light Flare

Author(s) -

Thomas R. Metcalf,

D. M. Alexander,

H. S. Hudson,

D. W. Longcope

Publication year - 2003

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 - 10.1086/377217

Subject(s) - physics , flare , solar flare , astrophysics , chromosphere , magnetic reconnection , white dwarf , electron , particle acceleration , ionization , nanoflares , astronomy , solar energetic particles , coronal mass ejection , plasma , solar wind , spectral line , nuclear physics , stars , ion , quantum mechanics

We present observations of a large solar white-light flare observed on 2001 August 25, using data from the Transition Region and Coronal Explorer (TRACE) white-light channel and Yohkoh/HXT. These emissions are consistent with the classic type I white-light flare mechanism, and we find that the enhanced white-light emission observed by TRACE originates in the chromosphere and temperature minimum regions via nonequilibrium hydrogen ionization induced by direct collisions with the electron beam and by back-warming of the lower atmosphere. The three flare kernels observed in hard X-rays and white light are spatially associated with magnetic separatrices, and one of the kernels is observed to move along a magnetic separatrix at 400 km s-1. This is evidence in favor of particle acceleration models, which energize the electrons via magnetic reconnection at magnetic separators.

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