ISS a [NASDA]
The ISS (Ionosphere Sounding Satellite) series of satellites was Japan's first ionosphere sounding satellite project. After reaching orbit, they were named Ume.
ISS a or Ume 1 was used to monitor radio waves in the ionosphere and forecast conditions for optimal use of shortwave communications. A power supply system failure caused Ume to malfunction one month after launching.
ISS b or Ume 2 was put into orbit two years later as a replacement. Ume-2 kept gathering observation data even after its 1.5 year mission term. It finished its operation on 23 February 1983, because of deterioration of power generation.
|Type / Application:||Research, Ionosphere|
|Contractors:||Mitsubishi Electric (MELCO)|
|Power:||Solar cells, batteries|
|Mass:||139 kg (#a), 141 kg (#b)|
|Orbit:||991 km × 1005 km, 69.67° (#a); 974 km × 1220 km, 69.36° (#b)|
|ISS a (Ume 1)||1976-019A||29.02.1976||Ta LP-N||N-1|
|ISS b (Ume 2)||1978-018A||16.02.1978||Ta LP-N||N-1|