(r7) DemComputation < SDO

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<h1>DEM Computation</h1>

---++ Description

   * <b>Inputs:</b> AIA images in multiple wavelengths. 

   * <b>Outputs:</b> DEM curves for each pixel. 

   * <b>Problem:</b> AIA images from several channels will be taken to create DEM curves for each pixel. 


---++ Literature Search

<li>Intensity integral inversion techniques: A Study in preparation for the SOHO mission R A Harrison (Rutherford), A M Thompson (Glasgow U.). RAL internal report

Please see DemComputationRalReport for further information on this report. - Main.ElizabethAuden

<li>Coronal Thermal Structure from a Differential Emission Measure Map of the Sun. <BR>
J.W.Cook, J.S.Newmark, and J.D.Moses. 
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference held 22-25 June 1999</li>

<LI>EIT User's Guide http://umbra.nascom.nasa.gov/eit/eit_guide/</LI>

<LI>J.W.Cook, J.S.Newmark, and J.D.Moses. American Astronomical Society, 194th AAS Meeting, #100.03; Bulletin of the American Astronomical Society, Vol. 31, p.996
<UL><LI>Unfortunately this only provides the abstract from the meeting</LI></UL>

<LI>J.S.Kaastra, R.Mewe, D.A.Liedahl, K.P.Singh, N.E.White, and S.A.Drake. Astron. Astrophys. 314, 547-557 (1996).</LI>

<LI>V.Kashyap and J.J.Drake. Astrophysical Journal. 503, 450-466 (1998).</LI>

<LI>M.Gudel, E.F.Guinan, R.Mewe, J.S.Kaastra, and S.L.Skinner. Astrophysical Journal. 479, 416-426 (1997).</LI>

---++ Routines and Libraries

<LI> SPEX -  http://www.sron.nl/divisions/hea/spex
<UL><LI>Contains routine for calculating DEM from spectral data http://www.sron.nl/divisions/hea/spex/version1.10/trpb05.ps.gz</li></UL>

<LI> CHIANTI atomic database - http://www.damtp.cam.ac.uk/user/astro/chianti/chianti.html
<UL><LI>Contains a routine for calculating DEM from spectral data http://www.damtp.cam.ac.uk/user/astro/chianti/doc/cug.html#tth_sEc8.12</LI></UL>
   
<LI>ADAS - http://adas.phys.strath.ac.uk/
<UL><LI>Contains routines for calculating DEM from spectral data http://adas.phys.strath.ac.uk/docs/idl-manual/chap7-00.pdf</LI>
<LI>N.B. In order to get and use ADAS, you need to be affiliated with one of the consortium members. RAL is a consortium member.</LI></UL>

<LI>PINTofALE (Package for INTeractive Analysis of Line Emission
<UL><LI>IDL code by Kashyap and Drake based on Markov-Chain Monte-Carlo approach</LI></UL>
</UL>

</UL>
---++ Test Data

EIT data (all wavelengths). 

---++ Comments

Need to obtain multi-layer's response as a function of wavelength to this - if it isn't available due to ITAR,  this is a problem.

-- Main.SimonMartin - 03 May 2005
-- Main.ElizabethAuden - 11 Jan 2005
Topic revision: r7 - 2005-05-03 - SimonMartin