Suppression of equatorial spread F by sporadic E

Details Suppression of equatorial spread F by sporadic E Suppression of equatorial spread F by sporadic E

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1021s&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A2, pp. SIA 2-1, CiteID 1021, DOI 10.1029/2001JA000162

Physics

Space Physics

5

Ionosphere: Ionospheric Irregularities, Ionosphere: Equatorial Ionosphere, Ionosphere: Modeling And Forecasting

Scientific paper

We have examined quantitatively the influence a low-latitude, premidnight sporadic E layer might have on the daily and hourly development of equatorial spread F (ESF). In particular, we calculated changes in the flux tube-integrated Pedersen conductivity as it affects the growth rate of the Rayleigh-Taylor instability, which governs the initial development of ESF. We find that the growth rate is lowered by an order of magnitude with a density of 1 × 106 cm-3 in a slab from 115 to 120 km. Since sporadic E layers observed after dusk do not regularly reach these values, they are not a likely source of the daily variability in ESF. However, even a mild enhancement in the postsunset E region could lead to a significant suppression of ESF if it also inhibits the upward plasma drift of the prereversal enhancement, a key variable in the growth rate of the equatorial spread F instability. Thus, consistent with the nature of an instability, the second-order effect (suppressed upward drift) is more important than the first-order cause (reduced F region to E region conductivity) of inhibited ESF onset.

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