The files in the sub-directories below are named after by the date and 
their data type.

Typical subdirectories are named after the year and month and data value, e.g.:

     1994/01_jan

Data labeled with "mk3.gif" in the filename are purely qualitative.
The images of the corona are appropriate for display and morphological
purposes.  These data are in "gif" format

A typical qualitative image name is:  94d172.mk3.gif

Data which are quantitative are 16-bit integers of pB*e+10 B/Bsun
These data are available via special request *only* by emailing

  mlso_data_requests@ucar.edu

Rectangular format pB data has a typical image name of: 94d172.21_57.ch0.rpB

In this data, array size is 512 by 512.

In idl the images would be image=intarr(512,512)
   C                       short image[512][512]
   Fortran                 int*2 image(512,512)

The files contain the image followed by a binary footer and then a
short ascii footer.

On a UNIX system, use the command: 

    tail -21 94d172.21_57.ch0.rpB
     
to see the ascii footer.

In these images, the origin of the image array is in the lower left,
the center of the sun is at pixel 255.5,255.5 (C and idl)
		                  256.5,256.5 (Fortran)
Heliocentric North is straight up in the positive Y direction, 
Heliocentric East  is to the left, in the negative X direction.

The scale size is 104.45 pixels per solar radii.

I've made the idl code "seequal.pro" or "seequan.pro" to display the images.  
To use either, just enter idl and then type: 
    
    .r seequan
or
    .r seequal

**********************************************************************
Cylindrical format data are also 16-bit integers of pB*e+10 B/Bsun
A typical image name is:  94d172.21_57.ch0.pB
 
The array size is 128 by 720, cylindrical format, R, theta.
 
In idl the images would be image=intarr(128,720)
   C                       short image[720][128]
   Fortran                 int*2 image(128,720)
 
The files contain the image followed by a binary footer and then a
short ascii footer.

On a UNIX system, use the command:
 
    tail -21 94d172.21_57.ch0.pB.avg
 
to see the ascii footer.
 
In these images,  the delta R distance is 0.01042 Rsun beginning at 1.1224 Rsun,                  the delta theta distance is 0.5 degrees beginning at 0
                  degrees PA.
 
Thus, the first pixel is at 0 degrees PA, and 1.1224 Rsun
      the second pixel is at 0 degrees PA, and 1.13282 Rsun
 
      the 129th pixel is at 0.5 degrees PA, and 1.1224 Rsun
 
Note that 0 degrees PA is due North, 180 degrees PA is due South, Heliocentric.

**********************************************************************

If you have any questions, ask Alice Lecinski (303) 497-1523
					      alice@ucar.edu