Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0276s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0276
Physics
0358 Thermosphere: Energy Deposition (3369), 2400 Ionosphere (6929), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics
Scientific paper
The GUVI instrument on NASA's TIMED spacecraft records radiance data from 135.6nm OI emissions. This data obtained from GUVI's high altitude limb scans can be used to study the morphology of the Dayside Equatorial Anomaly as a function of various factors such as local time, longitudinal sectors, magnetic latitude, seasons and solar activity. This paper compares the GUVI observations with 135.6nm OI radiance values generated from global atmospheric models such as the TIGCM (Thermosphere Ionosphere General Circulation Model) and the GAIM (Global Assimilation of Ionospheric Measurements). The models generate electron density profiles of the atmosphere from which the 135.6nm radiance data are constructed and compared with GUVI observations at corresponding magnetic latitude, longitudes and local time. The comparisons are done for data corresponding to quiet time periods of geomagnetic activity and at different conditions of solar flux and seasons. This comparison of the model outputs and the GUVI observations will give us valuable insight into how closely the models can predict the Dayside EA conditions. This paper presents the technique used to generate radiance data from the models as well as the results of the comparison of the data with GUVI observations.
Christensen Andrew B.
Coakley H.
Crowley Geoff
Moon Todd K.
Paxton Larry J.
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