HRDI

HRDI stands for High Resolution Doppler Imager. It is an instrument used to measure the ionospheric plasma drift and density in the Earth's upper atmosphere. HRDI is a part of the Upper Atmosphere Research Satellite (UARS) mission launched by NASA in 1991. The instrument uses the Doppler shift of the 630.0 nm emission of the O+ ion to measure the plasma drift velocity. HRDI has provided valuable data on the dynamics of the Earth's upper atmosphere and its interaction with the solar wind.
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