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The Coronal Heating Paradox View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2006-10-04 10:27

The <I>coronal heating problem</I> has been with us over 60 years and hundreds of theoretical models have been proposed without an obvious solution in sight. In this Letter we point out that observations show no evidence for local heating in the solar corona, but rather for heating below the corona in the transition region and upper chromosphere, with subsequent <I>chromospheric evaporation</I> as known in flares. New observational evidence for this scenario comes from <OL> <LI> the temperature evolution of coronal loops, <LI> the over-density of hot coronal loops, <LI> upflows in coronal loops, <LI> the Dopplershift in coronal loops, <LI> upward propagating waves, <LI> the energy balance in coronal loops, <LI> the magnetic complexity in the transition region, <LI> the altitude of nanoflares and microflares, <LI> the cross-section of elementary loops, as well as from <LI> 3D-MHD simulations of coronal heating. </OL> The phrase <I>''coronal heating problem''</I> is therefore a paradoxical misnomer and should rather be addressed as <I>''chromospheric heating problem''</I> and <I>''coronal loop filling process''</I>. This paradigm shift substantially reduces the number of relevant theoretical models.

Authors: Aschwanden, Winebarger, Tsiklauri, and Peter
Projects: TRACE,Yohkoh-SXT

Publication Status: ApJ 659, 1673-1681 (April 20, 2007 issue)
Last Modified: 2007-04-03 16:12
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