Overview 1962-03-07 OSO 1973-05-14 Skylab 1975-10-16 GOES 1979-02-24 P78-1 1980-02-14 SMM 1981-02-21 Hinotori 1990-10-06 Ulysses 1991-04-05 CGRO 1991-08-30 Yohkoh 1994-03-02 CORONAS 1995-12-02 SOHO 1998-04-02 TRACE 2002-02-05 RHESSI 2003-01-25 SORCE 2006-09-22 Hinode 2006-10-26 STEREO 2008-10-19 IBEX 2010-02-11 SDO