SOLRAD

SOLRAD (short for "SOLar RADiation," sometimes presented as "SOLRAD") was an American series of satellites sponsored by the US Navy in a program to continuously monitor the Sun. SOLRAD was the Naval Research Laboratory's first post-Vanguard satellite.[1]

A first-series SOLRAD/GRAB
  1. ^ Wade, Mark. "Solrad". Archived from the original on December 28, 2016. Retrieved January 3, 2019.