The total solar eclipse of 1991 July 11, was photographed from Mauna Loa,
Hawaii, by a research team from the High Altitude Observatory of the
National Center for Atmospheric Research, Boulder, Colorado and Rhodes
College, Memphis, Tennesee.  The NCAR is sponsored by the National 
Science Foundation.

The photograph of the solar corona was taken with a camera system
developed by Gordon A. Newkirk, Jr.  This specialized instrument
photographs the corona in red light, 6500 A -- through a radially
graded filter that suppresses the bright inner corona in order to show
the much fainter streamers of the outer corona in the same photograph.


Credit: High Altitude Observatory and Rhodes College.

Technical Information for image:  WLCC91

Time:     17:31:11 UT 
Pangle:   1.60 degrees     Heliocentric north is 1.6 degrees counter
                           clockwise of vertical.  Vertical (top) is
			   geocentric north.  Left, (9 o'clock) is east.

			   To assist in orientation, the darkest region is to
			   the NORTH (top).  There is a bright "hook" prominence
			   in the NORTHWEST (upper right) and a barely visible
			   prominence in the SOUTHWEST (lower right).  There 
			   are several dots of prominences just slightly 
			   SOUTH of EAST (left, and just a little down).
 

Objective aperture  11.4 cm
Focal length         178 cm
Focal ratio          f/15
 
Film Kodak Technical Pan / 2415
 
Development   D19 - 5 minutes  (Film was developed at Sacramento Peak 
                                Observatory by Lou Gilliam)
 
Wavelength isolation filer - Schott OG-3
Effective wavelength       - 6500 A
 
Exposure  27 seconds  
 
Radial filter range - 10^4 in transmission.
 
 
 
Note:  There are round dark circular artifacts in the image.  These are
       the result of out of focus dust within the telescope.
 
 
 
ftp instructions follow:
 
    ftp 128.117.16.39
or
    ftp puu.hao.ucar.edu
 
    anonymous
        enter some identification, such as your email address
    cd mk3/pub/eclipse91/WLCC
    get data_descrip_WLCC91
    binary
    get WLCC91.gif
    quit
~