Far ultraviolet instrument technology

Abstract
<p>The far ultraviolet (FUV) spectral range (from about 115 nm to 180 nm) is one of the most useful spectral regions for characterizing the upper atmosphere (thermosphere and ionosphere). The principal advantages are that there are FUV signatures of the major constituents of the upper atmosphere as well as the signatures of the high-latitude energy inputs. Because of the absorption by thermospheric O<sub>2</sub>, the FUV signatures are seen against a \textquotedblleftblack\textquotedblright background, i.e., one that is not affected by ground albedo or clouds and, as a consequence, can make useful observations of the aurora during the day or when the Moon is above the horizon. In this paper we discuss the uses of FUV remote sensing, summarize the various techniques, and discuss the technological challenges. Our focus is on a particular type of FUV instrument, the scanning imaging spectrograph or SIS: an instrument exemplified by the Defense Meteorological Satellite Program Special Sensor Ultraviolet Imager and Thermosphere Ionosphere Mesosphere Energetics and Dynamics Global Ultraviolet Imager. The SIS combines spatial imaging of the disk with limb profiles as well as spectral information at each point in the scan.</p>
Year of Publication
2017
Journal
Journal of Geophysical Research: Space Physics
Volume
122
Number of Pages
2706-2733
Date Published
01/2017
ISSN Number
2169-9380
URL
https://onlinelibrary.wiley.com/toc/21699402/122/2
DOI
10.1002/jgra.v122.210.1002/2016JA023578