Soft Entry of Micrometeorites at Grazing Incidence or by Aerocapture

Details Soft Entry of Micrometeorites at Grazing Incidence or by Aerocapture Soft Entry of Micrometeorites at Grazing Incidence or by Aerocapture

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..129..127h&link_type=abstract

Icarus, Volume 129, Issue 1, pp. 127-133.

Computer Science

3

Scientific paper

A study is made of the conditions under which micrometeorites can enter the Earth's atmosphere without being melted or without having their nuclear tracks annealed. The two mechanisms studied are: (1) aerocapture followed by entry from a bound orbit; and (2) direct entry at large zenith angles. Mechanism (2) is generally more efficient if the maximum temperature is limited to 1600 K; some grains as large as 400 μm across can survive unmelted. Both mechanisms are competitive for maximum temperatures of 800 K. The estimated probabilities of entry (compared with the total flux to the Earth) are a few times 10^-3 for unannealed particles and several percent for unmelted ones.

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