OSIRIS (Optical Spectrograph and InfraRed Imager System) is an instrument that measures vertical profiles of spectrally dispersed, limb scattered sunlight from the upper troposphere into the lower mesosphere.
This restricts OSIRIS sunlit observations to the Northern hemisphere in May, June, July and August, and the Southern hemisphere in November, December, January and February.
OSIRIS measurements began November, 2001 and continue to the present.
The Odin satellite was operated until June 2007 as a joint mission between astronomy and aeronomy disciplines.
Odin has operated as a purely aeronomy mission since June, 2007, and continues to the present, with almost complete coverage.