Mathematics – Probability
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jspro..22..220b&link_type=abstract
Journal of Spacecraft and Rockets (ISSN 0022-4650), vol. 22, Mar.-Apr. 1985, p. 220, 221.
Mathematics
Probability
Clouds, Galileo Probe, Jupiter (Planet), Lightning, Planetary Atmospheres, Probability Theory, Apollo 12 Flight, Commercial Aircraft, F-4 Aircraft
Scientific paper
Lightning strikes to aerospace vehicles occur mainly in or near clouds. As the Galileo entry probe will pass most of its operational life in the clouds of Jupiter, which is known to have lightning activity, the present study is concerned with the risk of a lightning strike to the probe. A strike to the probe could cause physical damage to the structure and/or damage to the electronic equipment aboard the probe. It is thought to be possible, for instance, that the instrument failures which occurred on all four Pioneer Venus entry probes at an altitude of 12 km were due to an external electric discharge. The probability of a lightning strike to the Galileo probe is evaluated. It is found that the estimate of a strike to the probe is only 0.001, which is about the same as the expected failure rate due to other design factors. In the case of entry probes to cloud-covered planets, a consideration of measures for protecting the vehicle and its payload from lightning appears to be appropriate.
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