[Loops] [1106.1591] Solar Dynamics Observatory discovers thin high temperature strands in coronal active regions
Fabio Reale
reale at astropa.unipa.it
Thu Jun 9 06:30:33 MDT 2011
Thank you very much, Alan. I totally agree. I also look forward to
having broadband high-resolution X-ray spectroscopy of the non-flaring
corona not too far in the future!
Fabio
On 06/09/2011 01:56 PM, 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.
>>
>>
>>
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>>
>
> --
> ______________________________________________________________________
> 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
> 91405 ORSAY Cedex mobile : (33) 6 72 14 23 89
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> _____________________________________________________________________
>
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