Friends,
I'm glad to see that the EM loci method is put on a more quantitative basis, especially in relationship to Gaussian DEM functions with variable temperature spread. While the two methods can now being used interchangably thanks to this recent nice study of Landi and Klimchuk, the biggest diagnostic problem for coronal loops is (in my view) still the proper background subtraction. Every contaminations from background fluxes introduces always a bias towards broader multi-thermal DEMs. This problem is even worse for AIA data, because more filters involve more confusion.
Looking forward to a patented background subtraction technique.
Cheers, Markus
On Sep 23, 2010, at 6:25 AM, Klimchuk, James A. (GSFC-6710) wrote:
Friends,
The EM loci technique is frequently used to access whether a plasma is isothermal. The attached paper addresses the uncertainty in this technique and proposes a way to determine the range of thermal distribution widths that are consistent with a set of emission line data.
Cheers, Jim
James A. Klimchuk NASA Goddard Space Flight Center Solar Physics Lab, Code 671 Bldg. 21, Rm. 158 Greenbelt, MD 20771 USA
Phone: 1-301-286-9060 Fax: 1-301-286-7194 E-mail: James.A.Klimchuk@nasa.gov Home page: http://science.gsfc.nasa.gov/671/staff/bios/cs/James_Klimchuk_ssi.html
No endorsement by NASA is implied for any correspondence related to my role as an officer of professional organizations (American Geophysical Union, American Astronomical Society, International Astronomical Union).
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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 _______________________________________ ____________________________________