Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm41a..04h&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SM41A-04
Physics
2794 Instruments And Techniques, 7855 Spacecraft Sheaths, Wakes, Charging
Scientific paper
Spacecraft in geosynchronous Earth orbit (GEO) frequently undergo surface charging following injection of energetic (E ~ 10 keV) electrons into the environment, especially within the post-midnight sector. Charging data from the GEO spacecraft Defense Satellite Communication System (DSCS-III) B-7 have been recorded over one half solar cycle. The Charge Control Experiment (CCE) aboard DSCS-III B-7 recorded incident fluxes of energetic electrons, ion spectra for determining frame-to-plasma potentials, and dielectric surface-to-frame (differential) charging levels; additionally, it incorporated a Xe plasma contactor for neutralization of charged components. Previous studies have shown 1) a general correlation between geomagnetic activity indices and the severity of frame charging, and 2) a general correlation between the intensity of energetic electron fluxes and differential charging severity. However, it was also shown that the event-specific correlations contain enough variance to cast doubt on the utility of these correlations for a predictive system. With this study, we present both a principle components analysis and a multiple linear regression of the data which incorporate a combination of factors leading to both frame and differential charging, including the geomagnetic activity indices and intensities of the energetic electron fluxes.
Chun Francis K.
Cooke David L.
Habash Krause L.
Putz Victor B.
Ray Pallav Kumar
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