Solar Panel
Primary source of spacecraft electrical power, designed so
that normal satellite day light operation, plus required
battery charging power can last for approximately seven
years
Sun Sensors
Provides information on spacecraft spin rate and attitude
with respect to the sun line, and provides reference pulses for
the VAS system
Thermal Barrier
Assists in thermal control, which is accomplished by using passive energy
balance techniques
Ultra High Frequency (UHF) Antenna
Used to receive Earth-based data
VISSR Atmospheric Sounder (VAS)
See next page
VAS Sunshade
Shades the VISSR Atmospheric Sounder
X-Ray Sensor (XRS)
Uses ion chamber detectors to measure ionospheric effects associated with solar flares