[Loops] EM loci

[Markus J. Aschwanden]

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 at 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).
>  
> ********************************************************************************
>  
>  
> <em_loci.pdf>_______________________________________________
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> Loops at solar.physics.montana.edu
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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 at lmsal.com
_______________________________________
____________________________________



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