Accession Number : ADA185794

Title :   Global Convection Patterns in the High Latitude.

Descriptive Note : Final technical rept. 4 Mar 83-31 Dec 86,

Corporate Author : TEXAS UNIV AT DALLAS RICHARDSON CENTER FOR SPACE SCIENCES

Personal Author(s) : Heelis, R A

PDF Url : ADA185794

Report Date : Feb 1987

Pagination or Media Count : 23

Abstract : Studies of large and small scale structures in the high latitude F-region plasma velocity and concentration have been undertaken. The large-scale plasma convection pattern has been examined using an extensive satellite data base to reveal a major dependence of the dayside configuration of the pattern on the y-component of the interplanetary magnetic field. A model has been constructed for periods of southward IMF much smaller scale structure is seen to dominate the observations. A smaller scale convection pattern has been tentatively identified in the data for northward IMF. Of primary importance, however, is the existence of small scale structure associated with sun-aligned arcs that have dimensions in the noon-midnight-direction that exceed those in the dawn-dusk direction by a factor of 10. In addition to these properties of the convection pattern the formation of E region structure by the presence of structure in the F region has also been examined. Keywords: Ionospheric plasma; Convection pattern; Plasma structure.

Descriptors :   *IONOSPHERE, *CONVECTION(ATMOSPHERIC), DATA BASES, E REGION, F REGION, GLOBAL, HIGH LATITUDES, INTERPLANETARY SPACE, MAGNETIC FIELDS, PATTERNS, PLASMAS(PHYSICS), SCIENTIFIC SATELLITES

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE