Global Exospheric Temperatures Derived from Emission Scale Heights

Physics

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0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 0394 Instruments And Techniques

Scientific paper

The High Resolution Airglow and Aurora Spectroscopy (HIRAAS) experiment was launched from Vandenberg AFB, CA aboard the Advanced Research and Global Observation Satellite (ARGOS) on 23 February 1999 at 2:29:55 AM Pacific Standard Time. The ARGOS is in a sun synchronous, circular orbit at an altitude of 843 Km. The HIRAAS experiment contains the Low Resolution Airglow and Aurora Spectrograph (LORAAS). The LORAAS gathers limb scans over the 750-100 Km altitude range, covering the 800-1700 Å passband at 17 Å resolution. We report our measurements of the daytime exospheric temperature derived by analysis of the scale height variation of the N2 Lyman-Birge-Hopfield emissions. We find generally good agreement with the MSIS-86 model, although our temperatures tend to be somewhat higher than the MSIS-86 predictions. The inversion technique is also presented.

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