Whitepaper #267 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: planetary ionospheres / upper atmospheres.
The INDI instrument has been designed to measure red-line (λ = 630.0 nm) oxygen emissions in the upper atmosphere with a small footprint that will fit in a 6U cubesat or smallsat. INDI uses a Doppler Asymmetric Spatially Heterodyned (DASH) interferometer to observe the wind-induced Doppler shift of thermospheric airglow emission to determine horizontal wind vectors versus altitude.