Update of the impact ionization problem

Details Update of the impact ionization problem Update of the impact ionization problem

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982giot.rept...15h&link_type=abstract

In ESA GIOTTO Spacecraft Gas and Plasma Environ. p 15-19 (SEE N82-25962 16-75)

Physics

European Space Programs, Halley'S Comet, Ionization Potentials, Spacecraft Charging, Entropy, Gold Coatings, Impact, Iron, Micrometeorites, Shock Waves, Spacecraft Shielding

Scientific paper

Model calculations on the impact ionization of Fe particles are updated in order to account for an impact velocity of w = 68 km/sec, as well as for variations of the shield material (aluminum and gold). Extrapolation of previous shock wave entropies (S) gives values between 95, + or - 5, and 108, + or - 5, cal/k mole, for u sub p between 42 and 55 km/sec, where u sub p = w/1 + the square root of the density ratio of the impacting micrometeorite particle and the shield material. The expansion isentropes for u sub p = 42 km/sec, S = 95 cal/k mole, and u sub p = 55 km/sec, S = 108 cal/k mole were determined for a partly ionized Fe gas. The degrees of ionization at the end of the recombination phase are 40% and, 60% respectively i.e. drastic variations of the impacting particle/shield ratio cause variations in the degree of ionization of only a factor of 1.5. Gold coatings should have no serious disadvantages if shock wave ionization is a minor consideration.

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