[Loops] summaries on nanoflare debates in "coronalloopworkshops"
Leon Golub
golub at cfa.harvard.edu
Fri Mar 6 14:18:33 MST 2009
OK, I have to jump in, since there seems to be some confusion about
this. Yes, the increase in coronal density comes up from the
chromosphere. This has been known for decades and has been well-modeled,
especially by the Palermo group. But it is entirely possible for the
energy to be deposited in the corona, then travel down (relying on the
ambient density) to be deposited and cause evaporation. The pattern of
brightness variations that you see does, in fact, change depending on
where in the loop the energy is deposited, and can be used to determine
where it happened. By seeing how the loop brightens, you can tell where
the energy deposition took place. See:
>
> A Brightening Coronal Loop Observed by TRACE. II. Loop Modeling and Constraints on Heating
> Reale, F.; Peres, G.; Serio, S.; Betta, R. M.; DeLuca, E. E.; Golub, L.
> Astrophysical Journal, Volume 535, Issue 1, pp. 423-437.
Leon
Markus J. Aschwanden wrote:
>
> 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
>
>
>
> ____________________________________________
> 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 at lmsal.com <mailto:aschwanden at lmsal.com>
> _______________________________________
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