NSSDCA ID: PSPG-00926
Availability: Data Identified but not Received
Time span: 1971-07-31 to 1976-02-22
This collection consists of digitized microfilm frames containing tabular data that measure the long-term effects of the lunar environment on solar cells. These data consist of voltages from each cell and temperatures from the three thermistors during daytime conditions. Dust Thermal Radiation Engineering Measurement (DTREM) outputs consist of (1) internal temperature, (2) cell temperature, (3) external infrared temperature, (4) bare-cell output voltage, (5) 0.15-mm irradiated-cell output voltage, and (6) 0.15-mm cell output voltage as a function of time. The tables include the measurement time to the thousandth of a second and the Sun elevation angle to the nearest hundredth of a degree. Temperatures from the internal and external temperature sensors are listed, but not the cell temperature sensor. It also gives both the uncorrected and temperature corrected values of the output voltages. The data cover the period from instrument turn on (31 July 1971) to 22 February 1976 on 19 microfilm reels. cells range from 298 to 398 K (25 to 125 deg C). Voltages from the cells range from 0 to 70 mV during sunlight conditions, depending on sun angle and individual cell characteristics. Measurements were made roughly every 54 seconds.
In general the irradiated cells showed a power drop of 1 percent per year and the nonirradiated cell 3.5 percent per year. The uncovered cell had a total power drop of about 16 percent in the first year before leveling off to a decline of roughly 5 percent per year. A major solar particle event in August 1972 caused a drop of approximately 7 percent in the uncovered cell
For this digitization effort the NSSDCA scanned the source microfilm collection PSPG-00033 at a resolution of 400 dots per inch and output each frame on the film as one TIFF file. The NSSDCA also combined groups of these TIFF images into multipage PDF files to facilitate browsing. Both formats are included in this collection.
Questions and comments about this data collection can be directed to: Ms. Stephanie A. McLaughlin
Name | Role | Original Affiliation | |
---|---|---|---|
Mr. James R. Bates | General Contact | NASA Johnson Space Center | jbates@ems.jsc.nasa.gov |