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The HRDI Balloon Flight Instrument (1972-1993 1 linear foot), subseries contains information regarding the High Resolution Doppler Imager (HRDI). The HRDI was one of the instruments aboard the Upper Atmospheric Research Satellite, which was launched by NASA to study the Earth's stratosphere and mesosphere. The HRDI observed the emission and absorption lines of molecular oxygen. The UARS was launched in September 1991 and deactivated December 2005. Included are correspondence, meeting notes, schematics, and research notes regarding the building of the HRDI Balloon.

The TIDI, TOMS, Balloon Rotator, Antarctic Magnetometer, and MFPI (1980-1994 1 linear foot), subseries contains information regarding the TIMED Doppler Interferometer (TIDI), Total Ozone Mapping (TOMS), Balloon Rotator, Antarctic Magnetometer, and the Multiplex Fabry-Perot Interferometer (MFPI). The MFPI is a remote sensing instrument that measures the trace gases in the Earth's atmosphere. Contained in the series are notes and schematics regarding the swinging etalon component. There are also notes, drawings, and tests regarding the balloon rotator and the Antarctic magnetometer. The bulk of the series covers the design and testing of the TIDI and TOMS projects. Both projects contributed to the study of the Earth's atmosphere. Contained within the series are meeting notes, designs, schematics, and viewgraphs of the two projects.