Dear Markus,
I am gratified that you find me dazzling...I mean that you find the paper dazzling! Most credit goes to Durgesh who did all the hard work. As you and others must appreciate, working with spectroscopic data is non-trivial. Hinode/EIS is a great instrument, but the observations require a lot of careful and meticulous analysis. We are looking forward to the rise of the next solar cycle when we can pursue some more observations of active regions. So far, we have just had a 'taster'.
Thanks for the reference. We look forward to some animated discussions at the Loops meeting in Firenze!
Best wishes, helen
On Jan 6 2009, Markus J. Aschwanden wrote:
Helen et al,
Congratulations to the new dazzling Hinode paper!
On the same note, from the statistics of some 18,000 loop widths measurements in the 3 TRACE filters we found a slight dependence that loops become wider (or fuzzier) with temperatures, i.e.,
w(T) ~ T^(1.3+/-0.7)
(see Aschwanden, Nightingale, & Boerner 2007, ApJ 656, 577). So loops at T=2 MK are about a factor of 3 fatter than at T=1 MK. The inferred coronal filling factors vary also slightly with temperature, from q~0.74 at T=1 MK to q~0.32 at T=2 MK, which goes along the lines Leon suggests.
Cheers, Markus
On Jan 6, 2009, at 1:08 PM, reale@astropa.unipa.it wrote:
I agree with Leon, but I also think that the paper only certifies that the loops look fuzzier in hotter lines. There may be no real contradiction with Leon's perspective. Of course, we all sustain Leon's new imager. Ciao Fabio
Helen et al.,
I can't let this go uncommented. Even though this paper was accepted (I know, I was the editor) I disagree with the conclusion that hot loops are fuzzier. Yes, that's what you see, but it is also explainable if the hot parts of the AR have many fine threads (unresolved at present resolution) with a large filling factor. That as the conclusion Joan and I came to from analyzing 284A data.
Anyway, this won't be settled until we fly an imager with higher resolution. We're proposing one this year and I'm hoping we get the chance to clear this up, finally. Cheers,
Leon _______________________________________________ Loops mailing list Loops@solar.physics.montana.edu https://mithra.physics.montana.edu/mailman/listinfo/loops
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Dr. Markus J. Aschwanden Solar & Astrophysics Laboratory Lockheed Martin Advanced Techology Center Org. ADBS, Bldg. 252 3251 Hanover St., Palo Alto, CA 94304, USA Phone: 650-424-4001, FAX: 650-424-3994 URL: http://www.lmsal.com/~aschwand/ e-mail: aschwanden@lmsal.com _______________________________________ ____________________________________
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