Can Spread-F Be Stopped?

Details Can Spread-F Be Stopped? Can Spread-F Be Stopped?

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52c07m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52C-07

Physics

2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities

Scientific paper

Equatorial spread-F (ESF) has well known occurrence patterns with longitude and month, giving rise to the notion of "ESF seasons" at various locations. During these periods, ESF could occur each night, but does not. These seasons can be accounted for by the cyclic variations of the geophysical parameters associated with the Rayleigh-Taylor plasma instability. We have argued that an "inhibitor" must be present on occasion to suppress the expected onset of ESF, and thus the day-to-day variability within ESF season is due to a mix of possible inhibitors. The nature of the inhibitor(s) must be related to the very same parameters that account for the seasonal-longitude pattern. Potentially, these include neutral winds, E-region conductivities, ion-neutral collision frequencies, electric fields generated locally and/or of magnetospheric origin, and gravity wave occurrence. In this paper we present results of tests of some of these processes, both via models and observations. Audience participation is encouraged.

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