Statistics – Methodology
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.........8s&link_type=abstract
Ph.D. Thesis Kent Univ., Canterbury (England).
Statistics
Methodology
Earth Orbital Environments, Hypervelocity Impact, Long Duration Exposure Facility, Micrometeoroids, Particulates, Penetration, Space Debris, Thin Films, Attitude (Inclination), Dynamic Models, Gravity Gradient, Isotropy, Optical Measurement, Populations
Scientific paper
This dissertation is a study of the near-Earth space microparticulate environment from an analysis of the data from the National Aeronautics and Space Administration's satellite the Long Duration Exposure Facility (LDEF). Existing interplanetary and man-made orbital debris measurements and models are initially reviewed. An analysis of hitherto unexamined hypervelocity impact data is then undertaken to define a new particulate penetration limit of thin films and this new formula is then utilized in re-calibrating these pre-LDEF impact experiments. A three dimensional isotropic, single velocity model of the unbound interplanetary micrometeoroid environment as encountered by LDEF is then presented. The relative interplanetary geometry conversions, and impact velocities, for each of LDEF's 14 oriented faces can then be calculated, depending upon an initial mean geocentric particle velocity. Using this dynamic model, coupled with a methodology of flux transformations, it is shown how the LDEF data set can be decomposed into interplanetary and orbital populations, by making simple assumptions about them, and utilizing LDEF's unique gravity gradient stabilized orbital attitude. From this modelling the LDEF interplanetary flux distribution at one astronomical unit from the Sun, along with the mean geocentric particle velocity, can be defined. This flux and velocity are then seen to compare favorably with pre-LDEF models, re-calibrated with the new penetration formula, and optical detection measurements of meteors. The orbital particulate component can then also be defined by comparing the modelled interplanetary fluxes with the actual LDEF impact record, and incorporating similar dynamic modelling and flux transformations. This is also observed to compare well with pre-existing orbital debris measurements, if again, these are re-calibrated with the new formula.
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