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George et al.,<br>
<br>
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.<br>
<br>
Leon<br>
<br>
<br>
On 6/9/2011 9:01 AM, Doschek, George wrote:
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<div class="Section1">
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;">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 <st1:country-region w:st="on"><st1:place
w:st="on">US</st1:place></st1:country-region>
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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;">To the group: Please add whatever
else I
may have overlooked.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;">George Doschek<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial; color: navy;"><o:p> </o:p></span></font></p>
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<hr tabindex="-1" width="100%" align="center"
size="2">
</span></font></div>
<p class="MsoNormal"><b><font color="black" face="Tahoma"
size="2"><span style="font-size: 10pt; font-family:
Tahoma; color: windowtext; font-weight: bold;">From:</span></font></b><font
color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color:
windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:loops-bounces@mithra.physics.montana.edu">loops-bounces@mithra.physics.montana.edu</a>
[<a class="moz-txt-link-freetext" href="mailto:loops-bounces@mithra.physics.montana.edu">mailto:loops-bounces@mithra.physics.montana.edu</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>Alan
Gabriel<br>
<b><span style="font-weight: bold;">Sent:</span></b>
Thursday, June 09, 2011 7:56
AM<br>
<b><span style="font-weight: bold;">To:</span></b> A
mailing list for scientists
involved in the observation and modeling ofsolar
loop structures<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [Loops] [1106.1591]
Solar Dynamics Observatory discovers thin high
temperature strands in coronal
active regions</span></font><font color="black"><span
style="color: windowtext;"><o:p></o:p></span></font></p>
</div>
<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size: 12pt;">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 : <o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;">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 href="http://arxiv.org/abs/1106.1591"
moz-do-not-send="true">http://arxiv.org/abs/1106.1591</a><br>
<br>
The abstract is below.<br>
<br>
Best regards<br>
Fabio Reale<o:p></o:p></span></font></p>
<h1><b><font color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;">Solar Dynamics Observatory
discovers thin high temperature strands in
coronal active regions</span></font><o:p></o:p></b></h1>
<div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
class="descriptor"><font color="black" face="Times New
Roman" size="3"><span style="font-size: 12pt;">Authors:</span></font></span>
Fabio Reale, Massimiliano Guarrasi, Paola Testa, Edward
E. DeLuca, Giovanni<br>
Peres, Leon Golub<o:p></o:p></p>
</div>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal"><span class="descriptor"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;">Abstract:</span></font></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. <o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size: 12pt;"><br>
<br>
<o:p></o:p></span></font></p>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"><o:p> </o:p></span></font></pre>
<pre><fieldset class="mimeAttachmentHeader"></fieldset><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"><o:p> </o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">_______________________________________________<o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">Loops mailing list<o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"><a moz-do-not-send="true" href="mailto:Loops@solar.physics.montana.edu">Loops@solar.physics.montana.edu</a><o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"><a moz-do-not-send="true" href="https://mithra.physics.montana.edu/mailman/listinfo/loops">https://mithra.physics.montana.edu/mailman/listinfo/loops</a><o:p></o:p></span></font></pre>
<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size: 12pt;"><br>
<br>
<o:p></o:p></span></font></p>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">-- <o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">______________________________________________________________________<o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">Alan GABRIEL <a moz-do-not-send="true" href="mailto:alan.gabriel@ias.u-psud.fr">alan.gabriel@ias.u-psud.fr</a> <o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"> <o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;"><o:p> </o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">Institut d'Astrophysique Spatiale tel : (33) 1 69 85 85 10<o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">Batiment 121, Universite Paris XI fax : (33) 1 69 85 86 75<o:p></o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">91405 ORSAY Cedex mobile : (33) 6 72 14 23 89<o:p></o:p></span></font></pre>
<pre><st1:country-region w:st="on"><st1:place w:st="on"><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">France</span></font></st1:place></st1:country-region> <o:p></o:p></pre>
<pre><font color="black" face="Courier New" size="2"><span style="font-size: 10pt;">_____________________________________________________________________<o:p></o:p></span></font></pre>
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