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dc.contributor.authorQiu, Jiong
dc.contributor.authorLongcope, Dana W.
dc.identifier.citationQiu, Jiong , and Dana W. Longcope. "Long Duration Flare Emission: Impulsive Heating or Gradual Heating?." The Astrophysical Journal 820, no. 1 (March 2016): 14. DOI: 10.3847/0004-637X/820/1/14 .en_US
dc.description.abstractFlare emissions in X-ray and EUV wavelengths have previously been modeled as the plasma response to impulsive heating from magnetic reconnection. Some flares exhibit gradually evolving X-ray and EUV light curves, which are believed to result from superposition of an extended sequence of impulsive heating events occurring in different adjacent loops or even unresolved threads within each loop. In this paper, we apply this approach to a long duration two-ribbon flare SOL2011-09-13T22 observed by the Atmosphere Imaging Assembly (AIA). We find that to reconcile with observed signatures of flare emission in multiple EUV wavelengths, each thread should be heated in two phases, an intense impulsive heating followed by a gradual, low-rate heating tail that is attenuated over 20–30 minutes. Each AIA resolved single loop may be composed of several such threads. The two-phase heating scenario is supported by modeling with both a zero-dimensional and a 1D hydrodynamic code. We discuss viable physical mechanisms for the two-phase heating in a post-reconnection thread.en_US
dc.description.sponsorshipNASA grant NNX14AC06Gen_US
dc.titleLong Duration Flare Emission: Impulsive Heating or Gradual Heating?en_US
mus.citation.journaltitleThe Astrophysical Journalen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.universityMontana State University - Bozemanen_US

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