Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1429b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1429
Other
[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [2419] Ionosphere / Ion Chemistry And Composition, [2423] Ionosphere / Ionization Processes
Scientific paper
The RAIDS experiment is a suite of eight instruments to be flown aboard the Japanese Experiment Module-Exposed Facility on the International Space Station (ISS) in 2009. One of the sensors is the Extreme Ultraviolet Spectrograph (EUVS). The EUVS measures the radiance of the Earth’s airglow with a f/5 Wadsworth spectrograph fronted by a mechanical grid collimator. The 0.1 x 2.3 degree field of view is imaged onto a wedge-and-strip two dimensional detector and collapsed into a one-dimensional spectrum. The vertical profile is assembled from a series of these spectra obtained as the RAIDS platform scans in altitude. Two grating positions provide coverage of the 50.0-85.0 nm region or the 77.0-110.0 nm region at 1.2 nm spectral resolution. We will present a discussion of the scientific targets for the RAIDS EUVS and, if launched on schedule, also the first spectra observed from this sensor. The EUVS is sensitive to a number of emissions in the Earth’s dayglow including atomic and ionized oxygen and argon, ionized nitrogen, and atomic helium. One of the primary RAIDS science objectives is to use the EUVS to obtain simultaneous OII 83.4 nm and 61.7 nm limb profiles to perform an in-depth investigation of the OII excitation and emission processes in the daytime ionosphere. Some of the more dominant spectral features such as the OI (98.9, 102.7 nm), OII (83.4, 61.7 nm), and NII (108.5, 91.6 nm) lines will provide the opportunity to develop new methods to monitor thermospheric O and N2. The OI (102.7 nm) observations may also be used, in conjunction with other RAIDS measurements, to retrieve the spectrally unresolved H Lyman beta and thus a measure of atomic hydrogen. The argon emissions Ar I (104.8, 106.7 nm) and Ar II (91.96, 93.21 nm) will provide information on its relative abundance in the lower thermosphere. . Combinations of measurements, such as the EUVS OI (98.9 nm) and the RAIDS Near Infrared Spectrometer OI (799.0 nm) emission can be used to probe the details of their associated branching ratios and excitation cross sections. Finally, the very quiet solar minimum period provides a unique opportunity to observe the He I 58.4 nm emission at these altitudes. The initial RAIDS EUVS spectra will highlight this potential wealth of future ionospheric and thermospheric studies that can be accomplished using such a unique dataset.
Bishop Richard L.
Budzien Scott A.
Christensen Andrew B.
Stephan Andrew Ward
Straus Paul R.
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