Orbital science's 'Bermuda Triangle'

Details Orbital science's 'Bermuda Triangle' Orbital science's 'Bermuda Triangle'

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991s%26t....81..134s&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 81, Feb. 1991, p. 134-139.

Physics

2

Magnetic Anomalies, Radiation Belts, Radiation Effects, Spacecraft Instruments, Earth Orbital Environments, Magnetic Field Configurations, Radiation Shielding, Spacecraft Communication, Spacecraft Design

Scientific paper

The effects of a part of the inner Van Allen belt lying closest to the earth, known as the South Atlantic Anomaly (SAA) upon spacecraft including the Hubble Space Telescope (HST), are discussed. The area consists of positively charged ions and electrons from the Van Allen Belt which become trapped in the earth's dipole field. Contor maps representing the number of protons per square centimeter per second having energies greater than 10 million electron volts are presented. It is noted that the HST orbit causes it to spend about 15 percent of its time in the SAA, but that, unlike the experience with earlier spacecraft, the satellite's skin, internal structure, and normal electronic's packaging provides sufficient protection against eletrons, although some higher energy protons still get through. Various charged particle effects which can arise within scientific instruments including fluorescence, Cerenkov radiation, and induced radioactivity are described.

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