Self-Consistent Modeling of Equatorial Dawn Density Depletions with SAMI3 (Invited)

Details Self-Consistent Modeling of Equatorial Dawn Density Depletions with SAMI3 (Invited) Self-Consistent Modeling of Equatorial Dawn Density Depletions with SAMI3 (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa24a..04h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA24A-04

Physics

[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2447] Ionosphere / Modeling And Forecasting

Scientific paper

Recently, large-scale, dawn density depletions in the equatorial ionosphere have been observed by instruments on the STPSat1 and C/NOFS satellites. These observations were unexpected and surprising. The 3D NRL ionosphere model SAMI3 is used to study this new phenomenon using a self-consistent electric field. Two wind models are considered in the analysis to generate the electric field: HWM93 and HWM07. Dawn density depletions are found using HWM07 but not with HWM93. The cause of the depletions is a post-midnight enhancement of the upward plasma drift. This drift lifts low density plasma to high altitudes (i.e., 600 km). The post-midnight enhanced upward drift is obtained from HWM07 but not HWM93. Thus, the neutral wind pattern is critical to this effect because it is the driver of the low-latitude electric field. Moreover, this new observation may be associated with the very low solar activity of solar cycle 24. We compare our model results to remote sensing data and to satellite data. (with J. Krall, G. Joyce, C.S. Siefring, and P.A. Bernhardt). Research supported by NASA and ONR

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