Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa24a..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA24A-05
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics, [2447] Ionosphere / Modeling And Forecasting
Scientific paper
Low-latitude plasma irregularities commonly observed during post sunset local times have been studied extensively by ground-based measurements such as coherent and incoherent scatter radars and ionosondes, as well as by satellite observations. The pre-reversal enhancement in the upward plasma drift due to eastward electric fields has been identified as the primary cause of these irregularities. Reports of plasma depletions at post-midnight and early morning local times are scarce and are typically limited to storm time conditions. Such dawn plasma depletions were frequently observed by C/NOFS in June 2008 [de La Beaujardière et al., 2009]. We are able to qualitatively reproduce the large-scale density depletion observed by the Planar Langmuir Probe (PLP) on June 17, 2008 [Su et al., 2009], based on the assimilative physics-based ionospheric model (PBMOD) using available electric field data obtained from the Vector Electric Field Instrument (VEFI) as the model input. In comparison, no plasma depletion or irregularity is obtained from the climatology version of our model when large upward drift velocities caused by observed eastward electric fields were absent. In this presentation, we extend our study for the entire month of June 2008 to exercise the forecast capability of large-scale density trenches by PBMOD with available VEFI data. Geophys. Res. Lett, 36, L00C06, doi:10.1029/2009GL038884, 2009.Geophys. Res. Lett., 36, L00C02, doi:10.1029/ 2009GL038946, 2009.
Burke William J.
de La Beaujardiere Odile
Hunton Donald E.
Pfaff Robert F.
Retterer John M.
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