On seeding equatorial spread F: Circular gravity waves

Details On seeding equatorial spread F: Circular gravity waves On seeding equatorial spread F: Circular gravity waves

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3710104t&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 10, CiteID L10104

Physics

7

Ionosphere: Ionospheric Irregularities, Ionosphere: Ionospheric Disturbances, Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Waves And Instabilities (2772)

Scientific paper

A direct link appears to exist between gravity wave (GW) activity in the troposphere and plasma structure in the nighttime equatorial F layer during the solstices. This finding strongly favors a role being played by a neutral-ion coupling process, which involves (1) a spatially-varying dynamo current, generated in situ by a GW, and (2) perturbation transfer to the plasma by a polarization electric field. We show, for the first time, how two more of the puzzling features in observed plasma structure, referred to as equatorial spread F (ESF), can finally be explained, if we allow GWs to have circular, instead of plane, phase fronts. These features include (1) early appearance of large-scale wave structure (LSWS) when the F layer is low, and (2) common appearances of a monochromatic LSWS with a long zonal wavelength.

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