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<TITLE>RE: [Loops] New Loops Paper</TITLE>
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<P><FONT SIZE=2>Dear Joan,<BR>
<BR>
We have presented some MHD seismological evidence that the loops have fine multi-thermal structure:<BR>
<BR>
\bibitem[King et al.(2003)]{2003A&A...404L...1K} King, D.~B., Nakariakov, V.~M., Deluca, E.~E., Golub, L., McClements, K.~G.\ 2003.\ Propagating EUV disturbances in the Solar corona: Two-wavelength observations.\ Astronomy and Astrophysics 404, L1-L4.<BR>
<BR>
<A HREF="http://adsabs.harvard.edu/abs/2003A%26A...404L...1K">http://adsabs.harvard.edu/abs/2003A%26A...404L...1K</A><BR>
<BR>
All the best,<BR>
<BR>
Valery<BR>
<BR>
-----Original Message-----<BR>
From: loops-bounces@mithra.physics.montana.edu on behalf of Joan T Schmelz (jschmelz)<BR>
Sent: Thu 1/15/2009 8:53 PM<BR>
To: A mailing list for scientists involved in the observation andmodeling ofsolar loop structures<BR>
Cc: kaouther2001@yahoo.com; Lisa Ann Rightmire(lrightmr); Jason Andrew Kimble (jakimble)<BR>
Subject: Re: [Loops] New Loops Paper<BR>
<BR>
Dear Colleagues,<BR>
<BR>
The attached paper has finally come out in the latest issue of ApJ (691:503-515, 2009 January 20). It seems we've been working on this one for a very long time!<BR>
<BR>
Regards,<BR>
Joan<BR>
<BR>
ARE CORONAL LOOPS ISOTHERMAL OR MULTITHERMAL?<BR>
J.T. Schmelz, K. Nasraoui, L.A. Rightmire, J.A. Kimble, G. Del Zanna, J.W. Cirtain, E.E. DeLuca & H.E. Mason<BR>
<BR>
ABSTRACT<BR>
Surprisingly few solar coronal loops have been observed simultaneously with TRACE and SOHO/Coronal<BR>
Diagnostics Spectrometer (CDS), and even fewer analyses of these loops have been conducted and published.<BR>
The SOHO Joint Observing Program 146 was designed in part to provide the simultaneous observations required<BR>
for in-depth temperature analysis of active region loops and determine whether these loops are isothermal or<BR>
multithermal. The data analyzed in this paper were taken on 2003 January 17 of AR 10250. We used TRACE<BR>
filter ratios, emission measure loci, and two methods of differential emission measure analysis to examine the<BR>
temperature structure of three different loops. TRACE and CDS observations agree that Loop 1 is isothermal with<BR>
log T = 5.85, both along the line of sight as well as along the length of the loop leg that is visible in the CDS<BR>
field of view. Loop 2 is hotter than Loop 1. It is multithermal along the line of sight, with significant emission<BR>
between 6.2 < log T < 6.4, but the loop apex region is out of the CDS field of view so it is not possible to<BR>
determine the temperature distribution as a function of the loop height. Loop 3 also appears to be multithermal,<BR>
but a blended loop that is just barely resolved with CDS may be adding cool emission to the Loop 3 intensities<BR>
and complicating our results. So, are coronal loops isothermal or multithermal? The answer appears to be yes.<BR>
<BR>
Link:<BR>
<BR>
<A HREF="http://www.iop.org/EJ/article/0004-637X/691/1/503/apj_691_1_503.pdf?request-id=f5d6ef63-7c08-4f3e-886e-4e101feb1846">http://www.iop.org/EJ/article/0004-637X/691/1/503/apj_691_1_503.pdf?request-id=f5d6ef63-7c08-4f3e-886e-4e101feb1846</A><BR>
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