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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.<br>
<br>
Leon<br>
<br>
<br>
On 6/9/2011 8:32 AM, Ed DeLuca wrote:
<blockquote cite="mid:4DF0BD72.5000006@cfa.harvard.edu" type="cite">
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Hi Alan,<br>
<br>
We have two "cunning plans":<br>
<br>
(1) there is a rocket proposal for a new grazing incident
spectrograph - Ken Kobayashi, Leon, Jonathan or Kelly can provide
more details.<br>
<br>
(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.<br>
<br>
Both of these operate in the soft wavelength band where we can
more easily see coronal heating.<br>
<br>
Ed<br>
<br>
On 6/9/11 7:56 AM, Alan Gabriel wrote:
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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??<br>
<br>
Alan Gabriel<br>
<br>
<br>
Le 09/06/2011 10:52, Fabio Reale a écrit :
<blockquote cite="mid:4DF089B4.3060109@astropa.unipa.it"
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Dear colleagues<br>
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:<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://arxiv.org/abs/1106.1591">http://arxiv.org/abs/1106.1591</a><br>
<br>
The abstract is below.<br>
<br>
Best regards<br>
Fabio Reale<br>
<br>
<h1 class="title"><small><small><small>Solar Dynamics
Observatory discovers thin high temperature strands in
coronal active regions</small></small></small></h1>
<div class="authors"><span class="descriptor">Authors:</span>
Fabio Reale, Massimiliano Guarrasi, Paola Testa, Edward E.
DeLuca, Giovanni<br>
Peres, Leon Golub<br>
<br>
</div>
<blockquote class="abstract"> <span class="descriptor">Abstract:</span>
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. </blockquote>
<br>
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<pre class="moz-signature" cols="72">--
______________________________________________________________________
Alan GABRIEL <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:alan.gabriel@ias.u-psud.fr">alan.gabriel@ias.u-psud.fr</a>
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
France
_____________________________________________________________________
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