Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ldef.symp..353o&link_type=abstract
In its LDEF: 69 Months in Space. Third Post-Retrieval Symposium, Part 1 p 353-360 (SEE N95-23796 07-99)
Physics
Earth Orbital Environments, Impact Damage, Interplanetary Dust, Long Duration Exposure Facility, Low Earth Orbits, Microparticles, Particle Trajectories, Space Debris, Spacecraft Structures, High Resolution, Nonuniformity, Position (Location), Size Distribution, Temporal Resolution
Scientific paper
The Interplanetary Dust Experiment (IDE) provided high time resolution detection of microparticle impacts on the Long Duration Exposure Facility satellite. Particles, in the diameter range from 0.2 microns to several hundred microns, were detected impacting on six orthogonal surfaces of the gravity-gradient stabilized LDEF spacecraft. The total sensitive surface area was about one square meter, distributed between LDEF rows 3 (Wake or West), 6 (South), 9 (Ram or East), 12 (North), as well as the Space and Earth ends of LDEF. The time of each impact is known to an accuracy that corresponds to better than one degree in orbital longitude. Because LDEF was gravity-gradient stabilized and magnetically damped, the direction of the normal to each detector panel is precisely known for each impact. The 11 1/2 month tape-recorded data set represents the most extensive record gathered of the number, orbital location, and incidence direction for microparticle impacts in low Earth orbit. Perhaps the most striking result from IDE was the discovery that microparticle impacts, especially on the Ram, South, and North surfaces, were highly episodic. Most such impacts occurred in localized regions of the orbit for dozens or even hundreds of orbits in what we have termed Multiple Orbit Event Sequences (MOES). In addition, more than a dozen intense and short-lived 'spikes' were seen in which impact fluxes exceeded the background by several orders of magnitude. These events were distributed in a highly non-uniform fashion in time and terrestrial longitude and latitude.
Cooke William Joe
Kassel Phillip C.
Kinard William H.
Mulholland John-Derral
Oliver John P.
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