Initial Observations of Ionospheric Structure and Irregularities Gathered with the VEFI Instrument on C/NOFS

Details Initial Observations of Ionospheric Structure and Irregularities Gathered with the VEFI Instrument on C/NOFS Initial Observations of Ionospheric Structure and Irregularities Gathered with the VEFI Instrument on C/NOFS

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa24b..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA24B-02

Physics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2481 Topside Ionosphere

Scientific paper

The Vector Electric Field Investigation (VEFI) onboard the C/NOFS spacecraft has returned more than 1500 orbits through the terminator and nightside equatorial regions since its launch in April 2008. C/NOFS is the first satellite with a high duty cycle able to make repeated measurements at all local times at a high repetition rate, and thus provides an invaluable tool to understand the spatial and temporal evolution of ionospheric structure post-sunset. Initial VEFI results reveal that the electric field and plasma density on the nightside, especially post-midnight, are highly structured, even during very quiet intervals. These structures have a significant enhancement in the electric field signature (3 or 4 times the background), and exhibit variability from > 100 km to < 1 m. We discuss how these structured regions compare with typical "Spread-F" signatures, compare their distribution in longitude, local time, and altitude, and present a detailed study of the relations between density and electric field variations for selected events. Finally, we will estimate the effects of this structure on radio wave transmission.

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