NSSDCA ID: SOVI-00002
Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)
Time span: 1973-05-29 to 1974-02-03
This 35-mm microfilmed data set contains H-alpha image data from Skylabs 2, 3, and 4. The data cover May 29 through June 18, 1973; August 7 through September 21, 1973; and November 26, 1973, through February 3, 1974. Each negative has two prints--one of density appropriate to the solar disk and the second for the solar limb. The disk and limb exposures for the same time period are on separate reels. Each frame is labeled by time in days, hours, minutes, and seconds. The day number, called H-alpha day, is an arbitrary time index from 0 to 63. A calendar is provided to convert H-alpha days to calendar days. There are some sun-orientation anomalies in this data set; the accompanying documentation explains the necessary corrections. Two problems occurred in the Dl4 films. The first was a film advance malfunction, causing overlapping of solar exposures. The second was a periodic image degradation caused by the telescope filter drift. For information on the main data base and this data set, contact Dr. Robert Noyes, Solar and Stellar Physics Division, Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.
Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Edward J. Schmahl | Data Provider | Harvard College Observatory | schmahl@hesperia.gsfc.nasa.gov |