Comapring Jicamraca and C/NOFS (VEFI) Observations of Equatorial Spread F Irregularities

Details Comapring Jicamraca and C/NOFS (VEFI) Observations of Equatorial Spread F Irregularities Comapring Jicamraca and C/NOFS (VEFI) Observations of Equatorial Spread F Irregularities

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa11b..07h&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA11B-07

Mathematics

Logic

2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772)

Scientific paper

Observations were made at the Jicamarca Radio Observatory in support of the C/NOFS satellite which made perigee passes over the observatory in the campaign period from Feb 18--21, 2009. Plasma density and vertical and horizontal plasma drifts were observed in a new, finely resolved incoherent scatter mode. Such observations make it possible to assess the stability of the postsunset ionosphere on the basis of flow characteristics and to search for precursors and telltales of equatorial spread F (ESF) such as large-scale seeding. At the same time, images of plasma irregularities resulting from ESF were made from spaced-receiver coherent scatter observations using aperture synthesis techniques. This imagery reveals the morphology of the unstable waveforms and the surrounding flow, morphology that often recapitulates the precursors. C/NOFS density and electric field measurements help to place the Jicamarca observations in spatio-temporal context and facilitate a quantitative analysis of ionospheric stability with possible forecast applications. Radar/spacecraft comparisons can also reveal the relationship between heretofore phenomenological coherent backscatter features (signal intensity, Doppler shift, etc.) and ionospheric state variables (density, electric field, etc.) The first results of such comparisons will be presented.

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