Abstract:

The Upper Atmosphere Research Satellite (UARS), to be launched in 1989, is to provide a global data set required to understand the mechanisms contolling upper atmosphere structure and processes, as well as the response of the upper atmosphere to natural and human perturbations.

The High Resolution Doppler Imager (HRDI) is the primary instrument for measuring the dynamics of the sratosphere and mesophere. The goal of HRDI is to measure wind velocities in the stratophere and mesosphere during the day and the mesosphere and thermosphere at night with an accuracy of 5 m/sec. HRDI will determine winds by measuring Doppler shifts of atmosphere absorbtion and emission features. Line of sight winds will be taken in two directions, thus allowing the wind vector to be formed.

This paper overviews the HRDI instument. The basis of the measuremnet is explained, as is an outline of the instrument. Since neither instrument or observational techniques is fully maturem only a brief sketch is presented here.