The Solar Maximum Mission (SMM) spacecraft was launched on February 14, 1980, near the height of the solar cycle, to enable the solar phsyics community to examine, in more physically meaningful detail than ever before, the most violent aspect of solar activity: flares.SMM recorded its final data in November, 1989.
(From NASA's Solar Maximum Mission: A Look at a New Sun)
Energy Range: 25 - 500 keV.
Energy Range: 10 - 140 MeV for Gamma Rays and neutrons above 20 MeV, and 10 - 140 keV for hard X-rays.
Wavelength Range: 1170 - 1800 Ångstroms in second order, and up to 3600 Ångstroms in first order.