Title: 
==============
Spatial Power Spectra of Magnetograms and Coronal Images

Lead Investigator:
=======
Piet Martens, ESA-SOC

Team Members:
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Daniel Gomez*, 
University of Buenos Aires

* for theoretical analysis		     

Local Coordinator:
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Not required

Lead Programmer:
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N/A

Technical Summary:
==================
I propose to Fourier analyze 5 to 10 full-disk magnetograms 
and nearly simultaneous EIT (all 4 bands) and Yohkoh full-disk 
images.
        

Proposal Text:
=======================
This investigation is a continuation of similar work on
ground-based magnetograms and NIXT and Yohkoh data.

I will verify the azimuthal symmetry of the 2D spatial
power-spectra, and the power-law structure of the azimuthally 
averaged spectra. A relation between the slopes of the 
power-laws for magnetograms and coronal X-ray images has been 
derived previously (ref. 1) and verified, but is not a priori 
clear how the EIT images fit in with to this relation -- if they
conform to our equation that indicates that the loops in EIT 
images are the result of stationary heating, just like SXT loops,
if not this will pose a challenge for further theoretical
analysis.

In addition, the relationship between the slopes for the
magnetograms and coronal images allows one to distinguish
between wave heating and joule heating of the corona (ref. 1).



	

See Also:
=========
1.  "Spatial Power-Spectra from Yohkoh Soft X-Ray Images"
     Petrus C. Martens and Daniel O. Gomez,
     Publ. Astron. Soc. Japan 44, L187-L191 (1992).

2.  "NIXT Power Spectra of X-Ray Emission from Solar Active
     Regions: I. Observations"
     D.O. Gomez, P.C.H. Martens, and L. Golub,
     Apj 405, 767-772 (1993).

3. "NIXT Power Spectra of X-Ray Emission from Solar Active
     Regions: II. Theory"
     D.O. Gomez, P.C.H. Martens, and L. Golub,
     Apj 405, 773-781 (1993).