Markus, you are definitely right that all coronal material originates in the chromosphere. If the energy release (heating) occurs in the corona, a downward thermal conduction flux (and possibly also a downward flux of nonthermal particles) causes material to evaporate into the corona. That is the traditional view. What other people (including you?) are proposing is that the energy release occurs directly in the chromosphere or transition region, and this process both heats the cool plasma and injects it upward.
Jim
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From: loops-bounces@solar.physics.montana.edu [mailto:loops-bounces@solar.physics.montana.edu] On Behalf Of Markus J. Aschwanden Sent: Friday, March 06, 2009 11:52 AM To: A mailing list for scientists involved in the observation and modeling ofsolar loop structures Subject: Re: [Loops] summaries on nanoflare debates in "coronalloopworkshops"
On Mar 6, 2009, at 8:44 AM, Klimchuk, James A. (GSFC-6710) wrote:
By the way, I do NOT believe that observations necessarily point to low altitude heating. My view is that observations are consistent with both low altitude and high altitude heating. Perhaps this should be a topic for Loops IV.
Jim
There is no way around to heat up first chromospheric material to fill coronal
loops to produce the enhanced soft X-ray and EUV emission we see from
coronal loops (like in flares). Any heating mechanism that heats directly
in the corona, does not increase the local density, so we would not see
any loops.
Markus
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Dr. Markus J. Aschwanden
Solar & Astrophysics Laboratory
Lockheed Martin Advanced Techology Center
Org. ADBS, Bldg. 252
3251 Hanover St., Palo Alto, CA 94304, USA
Phone: 650-424-4001, FAX: 650-424-3994
URL: http://www.lmsal.com/~aschwand/
e-mail: aschwanden@lmsal.com
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