منابع مشابه
Importance of Surface Conditions for Spacecraft Charging
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متن کاملA Threshold Effect for Spacecraft Charging
The existence of a threshold energy dependence is shown for the charging of geostationary spacecraft in eclipse. Applied Technology Satellite 6 and P78-2 (SCATHA) data show that plasma sheet fluxes must extend above 10 keV for these satellites to charge in eclipse. The existence of a threshold energy is significant because magnetospheric convection boundaries produce relatively sharp phase spac...
متن کاملEffects of Evolving Surface Contamination on Spacecraft Charging
The effects of evolving surface contamination on spacecraft charging have been investigated through (i) ground-based measurements of the change in electron emission properties of a conducting surface undergoing contamination and (ii) modeling of the charging of such surfaces using the NASCAP code. Specifically, we studied a Au surface as adsorbed species were removed and a very thin disordered ...
متن کاملNear-Minimum Time Optimal Control of Flexible Spacecraft during Slewing Maneuver
The rapid growth of space utilization requires extensive construction, and maintenance of space structures and satellites in orbit. This will, in turn, substantiate application of robotic systems in space. In this paper, a near-minimum-time optimal control law is developed for a rigid space platform with flexible links during an orientating maneuver with large angle of rotation. The time opti...
متن کاملThe NEAR Spacecraft RF Telecommunications System
n X-band telecommunications system developed for the Near Earth Asteroid Rendezvous (NEAR) spacecraft represents an unmatched combination of performance, innovation, and cost-effectiveness for a deep space mission. It centers about two redundant X-band transponder systems that provide the command, telemetry, and tracking functions. Despite a tight development schedule, a significant amount of n...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2012
ISSN: 0094-8276
DOI: 10.1029/2012gl050999