MICROFLARES

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MICROFLARES Powered By Docstoc
					       Overlaying images using
     Dominic Zarro’s plot_map.pro
http://orpheus.nascom.nasa.gov/~zarro/idl/maps.html
    Read data from fits files
IDL> fits2map, filename, map
map is a structure:
IDL> help,map,/st
  ** Structure <888988>, 13 tags, length=65648, data length=65637, refs=1:
  DATA FLOAT         Array                 [128, 128]
  XC                 FLOAT                  375.000
  YC                 FLOAT                 -310.000
  DX                  FLOAT                0.500000
  DY                 FLOAT                 0.500000
  TIME                STRING                 '13-Aug-2004 18:10:10.000'
  ID                 STRING                 ' HESSI '
  ROLL_ANGLE         FLOAT                  0.00000
  ROLL_CENTER FLOAT                        Array[2]
  DUR                DOUBLE                   104.75100
  XUNITS             STRING                   'arcsecs'
  YUNITS             STRING                    'arcsecs'
  SOHO BYTE 0
IDL> print, map.time
  13-Aug-2004 18:10:10.000
IDL>
                Displaying maps
 plot_map, eit_map, center=center, fov=fov

                  Overplot maps
plot_map, hsi_map, /over, /percent, levels=[30,50,70,90]

See plot_map.pro for keywords.
Images taken at L1 have different
     view than from Earth:
  Convert to EARTH view with:


  eit_map = map2earth ( eit_map )
            Pointing accuracy
• RHESSI: better than 1”
• EIT, MDI: ok, roll angle not that well known.
  0.5 degree uncertainty in roll angle makes 8” near
  limb.
• TRACE: information in header can be off by up to
  20”. Use EIT and/or MDI to correct:
  http://www.lmsal.com/~metcalf/TRACE/pointing.html
• GOES SXI: pointing does not agree with RHESSI
  systematically.
                More options
  • Plot limb
  • Rotate map
  • Correcting for solar differential rotation
  • subtracting maps
  • Make a sub-map, resize maps, creating
    maps
  • It is easy to write your own little programs
http://orpheus.nascom.nasa.gov/~zarro/idl/maps.html

				
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posted:2/12/2013
language:English
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