[Loops] summaries on nanoflare debates in "coronalloopworkshops"

[Petrus Martens]

Leon,

Dense as a brick...  I am not replying to Markus' input anymore.
You're right about our Italian friends though.  Once I am done with
tons of SDO-SC related organizing and resubmitting my loop paper,
there is a whole sequence of papers with Trae on coronal loops and
flares in queue.

Cheers,

Piet


Leon Golub wrote:
> 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, 05/2000.
> 
> 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>
>> _______________________________________
>> ____________________________________
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> Loops mailing list
>> Loops at solar.physics.montana.edu
>> https://mithra.physics.montana.edu/mailman/listinfo/loops
> _______________________________________________
> Loops mailing list
> Loops at solar.physics.montana.edu
> https://mithra.physics.montana.edu/mailman/listinfo/loops
> 


-- 
--------------------------------------------------------------------
  Piet Martens              Tel:   617-496-7769
  Center for Astrophysics   Fax:   617-496-7577
  60 Garden Street, MS 58   Cell:  617-999-0353
  Cambridge, MA 02138       pmartens at cfa.harvard.edu
--------------------------------------------------------------------