Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........65l&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, SAN DIEGO, 1990.Source: Dissertation Abstracts International, Volume: 52-02, Section:
Other
Satellites
Scientific paper
I have developed a semi-analytic model for differential charging of satellites. The model applies to a plasma whose free path gg Debye Length gg the size of the satellite. The potential of a barrier free surface is solved from the local charging current. On surfaces under barriers, the potentials are regulated by the self-consistency between barriers and the net charging current. When the potential under the barrier goes more positive, the barrier height increases. On other hand, a stronger barrier suppresses more outgoing electrons so that net current become more negative. When the a negative charge accumulates on the surface, the barrier would decrease. These two opposite tendencies are balanced if the barrier height reaches an appropriate value. After the potential on the barrier free surfaces and barrier structures are determined, the complete potential contours around a satellite can be solved. The differential potential can be separated into a "normalized potential" and a scale factor. The scale factor is the most negative potential on the barrier free surface which includes all the information about ambient plasma, time, and material. The normalized potential shows the ratio between the potential at any given location and the most negative potential. It indicates the relative differential charging which is an intrinsic property of the geometry. The theory also predicts that barrier height on a conductor is approximately proportional to the potential of satellite ground. The observational evidence for this is obvious from the spectrograms of UCSD particle detectors on the ATS-6 satellite. The accurate calculation of charging current is only needed for the barrier free surface. The orbit-limited criterion is satisfied for the repelled particles. The curvature radius of the orbit for zero energy particles is compared to the curvature radius of imagined surfaces enclosing the satellite in order to determine whether the current are orbit-limited for attracted particles. The ambient plasma is assumed to be isotropic until chapter seven where current collection in an anisotropic plasma is studied.
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