Are chromospheric nanoflares a primary source of coronal plasma?

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dc.citation.issueNumber1en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber791en_US
dc.contributor.authorKlimchuk, J.A.en_US
dc.contributor.authorBradshaw, S.J.en_US
dc.date.accessioned2014-08-13T14:14:20Zen_US
dc.date.available2014-08-13T14:14:20Zen_US
dc.date.issued2014en_US
dc.description.abstractIt has been suggested that the hot plasma of the solar corona comes primarily from impulsive heating events, or nanoflares, that occur in the lower atmosphere, either in the upper part of the ordinary chromosphere or at the tips of type II spicules. We test this idea with a series of hydrodynamic simulations. We find that synthetic Fe XII (195) and Fe XIV (274) line profiles generated from the simulations disagree dramatically with actual observations. The integrated line intensities are much too faint; the blueshifts are much too fast; the blue-red asymmetries are much too large; and the emission is confined to low altitudes. We conclude that chromospheric nanoflares are not a primary source of hot coronal plasma. Such events may play an important role in producing the chromosphere and powering its intense radiation, but they do not, in general, raise the temperature of the plasma to coronal values. Those cases where coronal temperatures are reached must be relatively uncommon. The observed profiles of Fe XII and Fe XIV come primarily from plasma that is heated in the corona itself, either by coronal nanoflares or a quasi-steady coronal heating process. Chromospheric nanoflares might play a role in generating waves that provide this coronal heating.en_US
dc.identifier.citationKlimchuk, J.A. and Bradshaw, S.J.. "Are chromospheric nanoflares a primary source of coronal plasma?." <i>The Astrophysical Journal,</i> 791, no. 1 (2014) IOP Publishing: http://dx.doi.org/10.1088/0004-637X/791/1/60.en_US
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/791/1/60en_US
dc.identifier.urihttps://hdl.handle.net/1911/76514en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by IOP Publishing.en_US
dc.subject.keywordSun: chromosphereen_US
dc.subject.keywordSun: coronaen_US
dc.subject.keywordSun: UV radiationen_US
dc.titleAre chromospheric nanoflares a primary source of coronal plasma?en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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