Disruption of Equatorial Spread-F Leading to a Fossil Bubble and Airglow Enhancement

Details Disruption of Equatorial Spread-F Leading to a Fossil Bubble and Airglow Enhancement Disruption of Equatorial Spread-F Leading to a Fossil Bubble and Airglow Enhancement

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21a1518k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21A-1518

Physics

0310 Airglow And Aurora, 2427 Ionosphere/Atmosphere Interactions (0335), 2439 Ionospheric Irregularities

Scientific paper

The NRL SAMI3/ESF ionosphere model[1] is used to show that, when equatorial spread-F (ESF) occurs in the presence of a steady, mild (20 m/s) meridional wind, the electron density in downwind "leg" of the geomagnetic field-aligned ESF bubble can exceed the background density. Further, a mild (10 m/s) converging zonal wind pattern can disrupt the upward motion of an ESF bubble, thereby creating a "fossil" ESF bubble. The fossil bubble occurs, not because of a lack of buoyancy as previously thought, but because the driving mechanism of the ESF instability has been interrupted. The cessation of ESF-related plasma uplift allows the downwind leg of the bubble to fill in, further enhancing the density in the downwind leg of the newly-fossilized bubble. A sequence of 630.0 nm images obtained with the Boston University all-sky imaging system at Arecibo (18.3 N, 66.7 W, 28 N mag) show ESF-related airglow depletions changing their pattern and becoming airglow enhancements. The results from the NRL SAMI3/ESF model provide an explanation for this enhancement as well as satellite observations of ESF-related ion density enhancements. [1] Huba, J.D., G. Joyce, and J. Krall, GRL, 35, L10102, doi:10.1029/2008GL033509, 2008

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