Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21b1453c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA21B-1453
Physics
[6245] Planetary Sciences: Solar System Objects / Meteors
Scientific paper
The flux of micrometeors (< 1 microgram) has long been an important unknown in the assessment of spacecraft hazards. Many efforts have been undertaken to determine the density and velocity of this population, particularly based on radar scattering using large aperture radars. Such instruments are required to produce a sufficient return from these small, though potentially overdense objects. Uncertainties remain, however, in tying the observed radar cross-sections to specific meteor parameters such as mass an density. To understand this phenomenon better, we have undertaken a theoretical and an observational campaign that is designed to determine empirically the mass flux coupled with a detailed simulation of the ablating material as the meteors disintegrate in the ionosphere. In particular, we have developed a collisional Monte Carlo simulation together with a Particle-in-Cell model to determine the self-consistent plasma profiles that occur during various stages of the meteor burn-up. We find the scaling associated with given ablation coefficients, velocities and meteoroid mass values. The implications of this work for determining meteoroid parameters empirically will be discussed.
Close Sigrid
Colestock Patrick L.
Zinn Joel
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