Digitized Airglow Data

Description

This data collection contains microdensitometer scans of the airglow photographs making up data set SPIO-00032 (Airglow Photographs). Each tape record contains one scan line. A file mark is placed at the end of each complete frame scan. Four file marks indicate the end of recording on a tape. The identification label at the beginning of each record gives the magnetic tape number and file number, date of the tape recording, ID of film frame, frame number, number of steps per scan line, number of scan lines, aperture size in micrometers, and speed of scan. Included in the record are the X and Y coordinates, the distance between density readings, and the density (or transmission) value. Details of the scan technique and calibration procedures are presented in the document distributed with the data. Also see Applied Optics, v. 16, no. 4, pp. 983-992, April 1977. For information on the main data base and this data set, contact Dr. Donald Packer, 1623 Fran Hammond Parkway, Alexandria, VA 22302.