Solar A [ISAS]
The objective of Solar A or Yohkoh (Japanese for sunbeam) is to study the high-energy radiations from solar flares (hard and soft X-rays and energetic neutrons) as well as quiet structures and pre-flare conditions. The mission is a successor to Hinotori, a previous Japanese spacecraft flown at the previous solar activity maximum in 1981.
Yohkoh is a three-axis stabilized observatory-type satellite in a nearly-circular Earth orbit, carrying four instruments: two imagers and two spectrometers. The spacecraft is a rectangular solid about 2 m square and 4 m long. The imaging instruments have almost full-Sun fields of view, to avoid missing any flares on the visible disk of the Sun.
Approximately 50 MB of data are accumulated per day, and stored on an on-board tape recorder with 10.5 Mbyte capacity. The Yohkoh mission is a cooperative mission of Japan, the US, and the United Kingdom.
|Type / Application:||Solar Observatory|
|Power:||2 deployable fixed solar arrays, batteries|
|Orbit:||517 km × 792 km, 31.3°|
|Solar A (Yohkoh)||1991-062A||30.08.1991||Ka LP-M||M-3S-2|