Solrad 8とは 意味・読み方・使い方

Solrad 8 is a spin-stabilized satellite oriented with its spin axis perpendicular to the Sun-satellite line. Solrad 8 was launched on November 19, 1965. Fourteen solar X-ray and ultraviolet (UV) photometers are pointed radially outward from its equator to view the Sun with each revolution. Solrad 8 performed normally except for the spin system, which failed to maintain 60 rpm. At spin rates below 10 rpm data reduction became difficult. When the spin rate decreased to 4 rpm on September 12, 1966, ground command succeeded in reactivating spinup to 78 rpm, which exhausted the gas supply. Once again spin rate decreased to 10 rpm by August 1967, reducing data collection substantially. Solrad 8 is also known as Explorer 30, SE-A and 01738.