Spectroheliogram Data

Description

These experimenter-supplied, spectroheliogram data are on magnetic tape created on a PDP 11/34 computer. The tapes are multifiled, with each file containing a seven-word header of Radix-50 title information for internal PDP use followed by an experiment header record and a variable number of logical header records and data records of 1024 bytes each. The experiment header record contains tape and experiment identification information, date and orbit number, and satellite position. A logical header record precedes each data record. It contains the dimension of the logical data array of the data record, wavelength information, time at start of logical record, absolute and differential temperatures, gate time, true spacecraft mode, calculated actual azimuth and elevation (for raster experiments only), and experiment type. Each data record contains an array of one of the following five experiment types: (1) spectroheliogram (observation of the variation of a single wavelength or several wavelengths in a line profile with time and with position on the solar disk); (2) spectroheliogram emission maximum or minimum, (3) flare watch (observation of the intensities at one wavelength with position within a small raster frame, (4) spectroheliogram with limb offset, and (5) emission maximum or minimum with limb offset. Date reduction programs for data analysis are available on data set -01I. For more information on the main data base, contact Dr. Charles Barth, Laboratory for Atmospheric and Space Physics, Campus Box 392, University of Colorado, Boulder, CO 80309.