[Loops] [1106.1591] Solar Dynamics Observatory discovers thin high temperature strands in coronal active regions

[Leon Golub]

Thanks, Ed. I did in fact just give a talk at the IAS that described the 
GI x-ray spectrometer and I plan to talk about it when I visit MSSL at 
the end of July. I'll have the writeup with me at the Loops V workshop, 
if anyone wants details.

Leon


On 6/9/2011 8:32 AM, Ed DeLuca wrote:
> Hi Alan,
>
>  We have two "cunning plans":
>
> (1) there is a rocket proposal for a new grazing incident spectrograph 
> - Ken Kobayashi, Leon, Jonathan or Kelly can provide more details.
>
> (2) A group at GSFC has had some success with microcalorimeters for 
> solar use. Simon Bandler and Jay may have additional comments on this. 
> The baseline detector would give ~2ev spectral resolution from 
> 0.5-6kev, with a high resolution inner array of 32x32 pixels 
> (~2"/pixel on a rocket) and a lower resolution outer array. The 
> development work has proceeded to the point that we are likely to 
> propose a solar rocket this year for the microcalorimeter.
>
> Both of these operate in the soft wavelength band where we can more 
> easily see coronal heating.
>
> Ed
>
> On 6/9/11 7:56 AM, Alan Gabriel wrote:
>> A nice paper and an important contribution to the debate. But the 
>> jury is still out. We may never resolve this without real 
>> spectroscopic evidence of the very hot component. Where is our future 
>> spectroscopy coming from??
>>
>> Alan Gabriel
>>
>>
>> Le 09/06/2011 10:52, Fabio Reale a écrit :
>>> Dear colleagues
>>>     please find at the following link the preprint of a work 
>>> accepted for publication on the ApJ Letters, showing new strong 
>>> evidence of finely-structured loops with impulsive nanoflare 
>>> activity in active regions:
>>>
>>> http://arxiv.org/abs/1106.1591
>>>
>>> The abstract is below.
>>>
>>> Best regards
>>> Fabio Reale
>>>
>>>
>>>   Solar Dynamics Observatory discovers thin high temperature strands
>>>   in coronal active regions
>>>
>>> Authors: Fabio Reale, Massimiliano Guarrasi, Paola Testa, Edward E. 
>>> DeLuca, Giovanni
>>>                                Peres, Leon Golub
>>>
>>>     Abstract: One scenario proposed to explain the million degrees
>>>     solar corona is a finely-stranded corona where each strand is
>>>     heated by a rapid pulse. However, such fine structure has
>>>     neither been resolved through direct imaging observations nor
>>>     conclusively shown through indirect observations of extended
>>>     superhot plasma. Recently it has been shown that the observed
>>>     difference in appearance of cool and warm coronal loops (~1 MK,
>>>     ~2-3 MK, respectively) -- warm loops appearing "fuzzier" than
>>>     cool loops -- can be explained by models of loops composed of
>>>     subarcsecond strands, which are impulsively heated up to ~10 MK.
>>>     That work predicts that images of hot coronal loops (>~6 MK)
>>>     should again show fine structure. Here we show that the
>>>     predicted effect is indeed widely observed in an active region
>>>     with the Solar Dynamics Observatory, thus supporting a scenario
>>>     where impulsive heating of fine loop strands plays an important
>>>     role in powering the active corona. 
>>>
>>>
>>>
>>> _______________________________________________
>>> Loops mailing list
>>> Loops at solar.physics.montana.edu
>>> https://mithra.physics.montana.edu/mailman/listinfo/loops
>>
>> -- 
>> ______________________________________________________________________
>> Alan GABRIELalan.gabriel at ias.u-psud.fr
>>
>>
>> Institut d'Astrophysique Spatiale            tel : (33) 1 69 85 85 10
>> Batiment 121, Universite Paris XI            fax : (33) 1 69 85 86 75
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