Monitoring sources of nuclear radiation in space 1985-1987 observations, revision

Details Monitoring sources of nuclear radiation in space 1985-1987 observations, revision Monitoring sources of nuclear radiation in space 1985-1987 observations, revision

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...8928483s&link_type=abstract

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Gamma Ray Spectra, Nuclear Radiation, Positrons, Radiation Sources, Space Power Reactors, Spectrum Analysis, Atmospheric Density, Emission Spectra, Gamma Ray Spectrometers, Geomagnetism, Scientific Satellites, Spacecraft Components

Scientific paper

The gamma-ray spectrometer (GRS) on NASA's Solar Maximum Mission satellite (SMM) has been monitoring Soviet nuclear reactors in space since 1980 when it detected radiation from COSMOS 1176. Direct observations of gamma radiation were made within about 500 km when the RORSATS (Radar Ocean Reconnaissance Satellites) were not occulted by a significant amount of material in SMM. Indirect observations were also made up to distances in excess of a few thousand kilometers. These observations were made when positrons and electrons produced in the outer layers of the reactor powered spacecraft reached SMM after being stored in the Earth's magnetic field. Details are provided of SMM's observations of the four RORSATS launched in 1985 and 1986, and are compared with measurements made of the seven RORSATS detected from 1980 to 1984. The average intensities from all the eleven reactor-powered satellites are consistent with each other, after correcting for distance of separation. The observed increase in the rate of distant detections of positrons from 1980 to 1984 is due to the decreasing atmospheric density above a few hundred km in the transition from maximum to minimum solar activity. The rate did not change significantly between 1984 and 1986.

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