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28 September 1999 High-resolution Ionospheric and Thermospheric Spectrograph (HITS) on the Advanced Research and Global Observing Satellite (ARGOS): quick look results
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Abstract
The High-resolution Ionospheric and Thermospheric Spectrograph (HITS) is a very high resolution (> 0.5 angstroms resolution over the 500 - 1500 angstroms passband) Rowland circle spectrograph that is currently flying on the USAF Advanced Research and Global Observing Satellite (ARGOS, launched 23 February 1999). The ARGOS is in a sun- synchronous, near-polar orbit at 833 km altitude with an ascending node crossing time of 2:30 PM. The instrument is designed to spectrally resolve the 834 angstroms triplet to demonstrate a new technique for remotely sensing the electron density in the F-region ionosphere. In addition, the HITS can spectrally resolve the rotational structure of the N2 Lyman-Birge-Hopfield bands, which can be used to infer the thermospheric temperature. The HITS can resolve the radiative recombination continuum produced by recombining O+ ions and electrons, which can be used to infer the electron temperature. The HITS will also produce a high spectral resolution array of the 500 - 1000 angstroms passband to produce a more accurate identification of some of the previously unresolved features of the dayglow spectrum. The instrument operates as a limb imager with a limb scan occurring every 100 seconds throughout the expected three year mission life. Its field-of-view is 0.06 degree(s) X 4.6 degree(s), which corresponds to 3 km (altitude) X 230 km (along the horizon) at the limb. The instrument's field-of-regard is 17 degree(s) X 4.6 degree(s), which covers the 100 - 750 km altitude range. We will present an overview of the instrument and discuss its calibration and in-flight performance.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth F. Dymond, Kenneth D. Wolfram, Scott A. Budzien, Clyde B. Fortna, and Robert P. McCoy "High-resolution Ionospheric and Thermospheric Spectrograph (HITS) on the Advanced Research and Global Observing Satellite (ARGOS): quick look results", Proc. SPIE 3818, Ultraviolet Atmospheric and Space Remote Sensing: Methods and Instrumentation II, (28 September 1999); https://doi.org/10.1117/12.364149
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