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Revisiting the Determination of the Coronal Heating Function from Yohkoh Data View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2001-06-29 11:51

The issue of uniform (or looptop) heating versus footpoint heating seems to be related to whether data are analyzed from instruments with broadband or narrowband temperature filters. A possible bias of broadband filters is the hydrostatic weighting of multi-temperature loops, which mimic a temperature increase with altitude, and thus yield a preference for looptop heating. In this Letter we revisit a loop system previously analyzed by Priest et al., for which footpoint heating was ruled out. We show that a uniform heating model is subject to unphysical solutions for the column depth and the altitude of the loop footpoints, while a footpoint-heating model yields acceptable physical solutions for a heating scale height of s_H approx 13 pm 1 Mm. The temperature increase with height can easily be explained by the hydrostatic weighting bias resulting from hot loops (Tmaxapprox 2.6 MK) embedded in a cooler (Tmaxapprox 1.0 MK) background corona.

Authors: Markus J. Aschwanden

Publication Status: ApJ 559, L171-L174
Last Modified: 2001-10-03 08:24
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