Accession Number : AD0755396

Title :   Lower Thermosphere Density Variations in the Southern Hemisphere,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Marcos,F. A. ; Champion,K. S. W. ; Fioretti,R. W.

Report Date : 01 DEC 1972

Pagination or Media Count : 23

Abstract : Profiles of the neutral atmospheric density have been obtained at high and middle latitudes in the southern hemisphere from OV1-15 (SPACES) satellite accelerometer measurements. The data were obtained during a geomagnetically quiet period near the equinox, 24-28 September 1968, when the satellite was in a nearly down-dusk orbit. Perigee moved from 50 degrees S to 65 degrees S during this period. Measurements were made in the altitude range 170-250 km. Density values at dusk at high latitudes (before perigee) are less than those at midlatitudes (after perigee). The average difference between the high latitude and midlatitude data is 15 percent. A longitudinal variation is superimposed on the latitudinal gradients. Enhanced densities at high southern latitudes are found at longitudes near the south geomagnetic pole. (Author)

Descriptors :   (*UPPER ATMOSPHERE, DENSITY), SCIENTIFIC SATELLITES, DRAG, ACCELEROMETERS, SOUTHERN HEMISPHERE

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE