Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa62a05m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA62A-05 INVITED
Physics
2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2494 Instruments And Techniques
Scientific paper
An ultraviolet imager is under development to image the ionosphere and thermosphere from geostationary orbit. The instrument will consist of two telescopes, one with a filter wheel to measure the atomic oxygen airglow emission at 130.4 nm and 135.6 nm and molecular nitrogen Lyman-Birge-Hopfield bands near 142.5 nm. The second telescope will image the atomic oxygen ion resonance multiplet at 83.4 nm. Both telescopes will have a field of regard of 1.5 degrees with resolutions of 0.01 degrees providing spatial coverage of 1500 km x 1500 km with a resolution of 10 km x 10 km. The telescopes will be mounted to a two-axis gimbal to image various regions of the disk and limb of the Earth. This instrument is tentatively planned to fly aboard an Air Force Space Test Program satellite in 2005. The primary science goals of the experiment are to image the nightside ionosphere using measurements of the OI 135.6 nm nightglow produced from radiative recombination of electrons with oxygen ions. These observations will be used to study the variability and dynamics of ionospheric irregularities. Secondary objectives include measurement of vertical profiles of electron density at night on the limb of the Earth and measurement of dayside oxygen ion profiles using the 83.4 nm resonant line. Additional objectives include: measurement of the dayside limb profiles of neutral density; studies of thermospheric heating and geomagnetic storms using observations of disk ratios of oxygen to nitrogen; studies of the morphology of the equator-ward edges of the aurora. It is anticipated that nightside ionospheric images can be obtained within 100 to 1000 seconds to allow high time resolution studies of the space weather effects in the ionosphere.
Dymond Ken F.
McCoy Robert P.
Thonnard Stefan E.
Wood Kent S.
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