HR: 0830h
AN: SM41A-04    [Abstracts]
TI: Solar Cycle Effects on Geosynchronous Satellite Surface Charging
AU: * Habash Krause, L
EM: linda.krause@usafa.af.mil
AF: US Air Force Academy, HQ USAFA/DFP 2354 Fairchild Dr, Suite 2A31, USAF Academy, CO 80919 United States
AU: Chun, F K
EM: francis.chun@usafa.af.mil
AF: US Air Force Academy, HQ USAFA/DFP 2354 Fairchild Dr, Suite 2A31, USAF Academy, CO 80919 United States
AU: Cooke, D L
EM: david.cooke@hanscom.af.mil
AF: AFRL Space Weather Center of Excellence, 29 Randolph Rd, Hanscom AFB, MA 01731 United States
AU: Putz, V B
EM: victor.putz@usafa.af.mil
AF: US Air Force Academy, HQ USAFA/DFP 2354 Fairchild Dr, Suite 2A31, USAF Academy, CO 80919 United States
AU: Ray, K P
EM: kevin.ray@hanscom.af.mil
AF: AFRL Space Weather Center of Excellence, 29 Randolph Rd, Hanscom AFB, MA 01731 United States
AB: 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.
DE: 2794 Instruments and techniques
DE: 7855 Spacecraft sheaths, wakes, charging
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly