Accession Number:

AD0683241

Title:

SCINTILLATION OBSERVATIONS OF SYNCHRONOUS SATELLITES.

Descriptive Note:

Environmental research papers no. 296,

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Report Date:

1969-01-01

Pagination or Media Count:

20.0

Abstract:

During 1967 and early 1968, it was possible to record amplitude scintillations from synchronous satellites over simultaneous periods of time from the Sagamore Hill Radio Observatory 54 degrees G.N.. Three satellites transmitted at 137 MHz these were ATS-1 on the western horizon -0.1 degrees to 0.75 degrees elevation, Canary Bird on the eastern horizon 7 degrees to 12 degrees elevation, and ATS-3 toward the south greater than 200 degrees azimuth and greater than 39 degrees elevation. In addition, the beacon of the near synchronous satellite LES-5 was recorded at 228 MHz. The basic pattern of scintillation was for a maximum to occur at midnight for the satellite observed in the southerly direction, and two hours earlier for the satellite observed to the east showing the effect of the time difference for the two ionospheric regions. During the summer particularly, and occasionally at other times, a secondary peak of scintillation was observed near local noon. Winter nighttime scintillation indices were generally lower than summer values. LES-5 observations at this latitude show occasional fades down to 20 dB. Individual fades last from several seconds to several minutes. The duration of fading periods varied from a few minutes to several hours. Author

Subject Categories:

  • Atmospheric Physics
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE