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

[Doschek, George]

Here is my reply with attachment:

 

Alan, in reply to you: The Japanese have chosen "Plan B" for the Solar-C mission, and according to Saku Tsuneta, they are moving forward with the project in spite of the horrible disaster they must deal with.  Plan B is a high spatial and spectral resolution imaging/spectrometer (~0.2") involving two instruments and a very high spatial resolution EUV/UV imager.  The combination covers the entire atmosphere from the chromosphere to X-ray solar flares (see attached white paper to the US decadal survey).  So Solar-C, if approved by funding agencies and implemented, should clarify a lot of the issues dealing with loops and how they are heated.

 

In addition, there is the Lockheed SMEX IRIS mission undergoing development, and there are also a number of interesting rocket experiments either under construction or proposed.

 

To the group: Please add whatever else I may have overlooked.

 

George Doschek

 

 

________________________________

From: loops-bounces at mithra.physics.montana.edu [mailto:loops-bounces at mithra.physics.montana.edu] On Behalf Of Alan Gabriel
Sent: Thursday, June 09, 2011 7:56 AM
To: A mailing list for scientists involved in the observation and modeling ofsolar loop structures
Subject: Re: [Loops] [1106.1591] Solar Dynamics Observatory discovers thin high temperature strands in coronal active regions

 

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 GABRIEL                               alan.gabriel at ias.u-psud.fr 
 
 
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