Accession Number : AD0735664

Title :   A Note on the High-Latitude Density Bulge Inferred from Low-Altitude Satellite Drag Data.

Descriptive Note : Rept. for Jun-Oct 71,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Ching,Barbara K.

Report Date : 31 DEC 1971

Pagination or Media Count : 16

Abstract : Drag data from the satellite OV1-15 are compared with the newest density model by Jacchi (1971a) at altitudes below 200 km. Residuals between the observed and model density indicate the presence of a high-latitude density bulge, thereby confirming the results of a previous study which was based on an older Jacchia model (1970). Recent composition measurements in the polar regions have indicated that the N2 density is enhanced in a localized region, but not O. This anomaly persists even under geomagnetically quiet conditions. These results provide an explanation of why a polar-region density bulge has been observed consistently only at low altitudes (<200 km) where N2 is the major constituent, but not at higher altitudes where O predominates. (Author)

Descriptors :   (*UPPER ATMOSPHERE, DENSITY), POLAR REGIONS, NITROGEN, OXYGEN, SCIENTIFIC SATELLITES, DRAG

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE