1975-014A
The Solar Radiation and Thermospheric Satellite (SRATS) was named Taiyo (Sun) after launch. The 86 kg satellite was launched into elliptical orbit.
Taiyo was an octagonal cylinder 0.7h 0.75d with four 0.5m booms.
Stage 3 is 1.14dia 2.34m long, with a mass 1254 kg full 170 kg empty, and burn time 53s, thrust 66.7 kN, Isp 284s.
It observed solar activity, in situ thermospheric plasma, and ozone backscatter. The objective was to study the effects of solar radiation at solar minimum on the low latitude thermosphere. Taiyo observed high radiation levels in the SAA.
| Taiyo | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1975 Feb 24 | 0525 | Launch by Mu 3C-2 | KASC |
| T+1:18 B1 sep | |||
| T+1:20 Stage 2 burn | |||
| T+2:31 Stage 2 burnout | |||
| Stage 2 sep | |||
| T+2:36 Fairing sep | |||
| T+3:55 spinup | |||
| 0530 | T+5:24 Stage 3 burn | -5456? x 257 x 31.6? | |
| 0531? | Stage 3 burnout | ||
| 0532? | Stage 3 sep | ||
| 0701 | 1st pass, Yo-yo despin | ||
| 120.1 249 x 3129 x 31.5 | |||
| 1975 Dec 25 | On standby | ||
| 1977 Mar 14 | End of transmissions | ||
| 1980 Jun 29 | Reentered | ||
Payload:
- SXR Solar X, 1cm2 PC, 6-9 keV, 9-12 keV (Tokyo/Matsuoka)
- SXU Solar Ly Alpha (SXU) Ionization chamber (Osaka/Oshio)
- IMP Plasma swept frequency impedance probe (Tohoku/Oya)
- GMV Geocoronal UV photometer (Tokyo/Tohmatsu), 2500A,2900A
- TEL Electron density, temp probes (ISAS/Oyama)
- TPI Positive Ion Temperature Langmuir probe (RRL/Miyazaki)
- CPI Passive ion composition mass spectrometer (RRL/Iwamoto)
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