Observations of the Post-Sunrise Generation of Eastward Electric Fields in the Low Latitude Ionosphere and Their Possible Association with Deep Plasma Density Depletions Near Dawn

Details Observations of the Post-Sunrise Generation of Eastward Electric Fields in the Low Latitude Ionosphere and Their Possible Association with Deep Plasma Density Depletions Near Dawn Observations of the Post-Sunrise Generation of Eastward Electric Fields in the Low Latitude Ionosphere and Their Possible Association with Deep Plasma Density Depletions Near Dawn

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51b1621k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51B-1621

Other

[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

Deep depletions in the ionospheric plasma density near the equator have been observed just before sunrise using instruments on the Communications/Outage Forecast System (C/NOFS) satellite. Here we study six consecutive orbits using the planar plasma density probe and the VEFI electric field sensor. These data were obtained on June 17, 2008 during a period of extreme solar minimum. One of these depletions, on orbit 915, was accompanied by a very large eastward electric field in phase with the density depletion. The origin of this large eastward field, at a time when that component of the field is usually small and westward, is still unclear. We find on orbits 917, 918, and 919 that a distinctly different, second type of relationship between the electric field and plasma density near dawn occurred. Eastward electric field enhancements were also detected, one of them nearly 3 mV/m, but they were observed east of the pre-dawn density depletions, which were very modest in size and depth, rather than being collocated with the depletions themselves. The other orbits showed no post-sunrise enhancement. Theoretical implications will be discussed.

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