Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9030166t&link_type=abstract
Unknown
Physics
Cosmic Rays, Gamma Ray Spectrometers, Radiation Belts, Radiation Measurement, Southeast Asia, Space Shuttles, Trapping, Approximation, Earth Orbital Environments, Geomagnetic Latitude, Orbit Calculation
Scientific paper
A new analysis was performed on the hand held HRM 3 gamma ray detector data collected from Shuttle missions STS-41B, 41C, 41D, 41G, and 51A. The new analysis shows no evidence for the existence of enhanced levels of radiation in low Earth orbit over South East Asia (i.e., in the area bounded by longitudes 100 to 190 deg east and latitudes 10 deg south to 15 deg north) as previously suggested. Variation in the detector count rates with geographical location are shown to be consistent with the variation of the cosmic ray flux with geomagnetic latitude, and also show expected increases due to the South Atlantic Anomaly (SAA) and outer belt electrons. However, at times poor quantitative agreement is found between the expected positions of the SAA or outer electron belt, and the Shuttle's geographical location on the occasions when high count rates were observed. It is believed that this lack of correlation is a result of the sensitivity of the trapped particle environment to geographical position and magnetospheric activity.
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