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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:
<blockquote cite="mid:4DF0B4E2.2060307@ias.u-psud.fr" type="cite">
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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"
type="cite">
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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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