JAXA/ISAS TAIYO (SRATS) was an upper-atmosphere observation mission launched on 1975-02-24 aboard M-3C-2 from Uchinoura. It observed solar soft X-rays, solar vacuum-ultraviolet radiation, ultraviolet geocoronal emission lines, and related upper-atmosphere phenomena; operations ended with reentry on 1980-06-29.
Alerts are unavailable because this mission is no longer active.