Michelson Interferometer for Global High-resolution Thermospheric Imaging
The primary objective of MIGHTI is to determine thermospheric winds and temperatures.
The wind information is determined from the Doppler shift of atomic oxygen airglow emission lines at 557.7 and 630.0 nm, and the temperature from the spectral shape of the O2 A-band emission at 756, 762, 765 and 772.2 nm, Spectral resolution 0.002 nm
Heritage of WINDII flown on UARS and SHIMMER flown on STPSat-1
Limb sounding, vertical electronic scanning by CCD, horizontal pointing at 45° and 135° from the flight direction. Wind measured between 90 and 300 km altitude (day), and between 90/105 and 200/300 km (night). Thermospheric temperature measured in the 90-105 km range.
Horizontal: <500 km
Coverage / Cycle
Latitude limited by the orbital inclination (27°)
Flown on an R&D satellite
2020 to ≥2024
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
Earth observation instrument Limb sounders Limb sounder
Subcomponent 1 UV/VIS/NIR scanning limb sounder
Tentative Evaluation of Measurements
The following list indicates which measurements can
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
Atmospheric temperature 4 - fair Limited to high atmosphere. NIR limb sounding by emission in the O2 A-band around 760 nm. Used for the thermosphere
Wind (horizontal) 4 - fair Limited to high atmosphere. VIS and NIR very-high resolution limb spectrometry. Doppler analysis of oxygen emission lines