TITLE

Density enhancements associated with equatorial spread F

AUTHOR(S)
Krall, J.; Huba, J. D.; Joyce, G.; Yokoyama, T.
PUB. DATE
February 2010
SOURCE
Annales Geophysicae (09927689);Feb2010, Vol. 28 Issue 2, p327
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Forces governing the three-dimensional structure of equatorial spread-F (ESF) plumes are examined using the NRL SAMI3/ESF three-dimensional simulation code. As is the case with the equatorial ionization anomaly (IA), density crests within the plume occur where gravitational and diffusive forces are in balance. Large ExB drifts within the ESF plume place these crests on field lines with apex heights higher than those of the background IA crests. Large pole-ward field-aligned ion velocities within the plume result in large ion-neutral diffusive forces that support these ionization crests at altitudes higher than background IA crest altitudes. We show examples in which density enhancements associated with ESF, also called "plasma blobs," can occur within an ESF plume on density-crest field lines, at or above the density crests. Simulated ESF density enhancements reproduce all key features of those that have been observed in situ.
ACCESSION #
48809079

 

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