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

[Leon Golub]

George et al.,

As I think you all saw from Ed DeLuca's message (I don't think that 
"loops-bounce" in the "From" header means your message has been 
rejected, right?), there are two instrument concepts being discussed 
these days for direct spectroscopic imaging at X-ray wavelengths. I 
think that the 5-25A wavelength range has excellent potential for 
addressing the controversies we're all embroiled in now. So in addition 
to the instruments George has mentioned, there are some new concepts 
that may have a chance of being tried out in the next few years. If NASA 
has adequate funding, we may get to see them flown soon.

Leon


On 6/9/2011 9:01 AM, Doschek, George wrote:
>
> 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 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 GABRIELalan.gabriel at ias.u-psud.fr  <mailto:alan.gabriel at ias.u-psud.fr>  
>   
>   
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