Accession Number : AD0707139

Title :   ELECTRON CONTENT AND SMALL SCALE IRREGULARITIES IN THE POLAR IONOSPHERE.

Descriptive Note : Scientific rept. (Final) 1 Nov 66-31 Oct 69,

Corporate Author : AURORAL OBSERVATORY TROMSO (NORWAY)

Personal Author(s) : Bratteng,Ove M. ; Frihagen,Jon

Report Date : 20 DEC 1969

Pagination or Media Count : 60

Abstract : Some results of high latitude measurements of electron content and scintillation by means of satellite beacons are presented and discussed. Studies previously reported have been extended and amplified. Some features of the diurnal variation of the polar cap electron content can be explained by quite reasonable models. The polar enhancement of electron content mapped in geomagnetic coincides with a corresponding maximum in VLF-noise. The electron content dependency on the mean sunspot activity has a marked semi-annual variation with a maximum at the equinoxes. Pc5 micropulsations seem to enhance the morning growth of the F-layer. Geomagnetic storms very often induce large variation in electron content. There is a trend for a positive phase during the first hours after sudden commencement followed by a rather large negative phase exhibiting a maximum after about 24 hours. The high latitude F-region irregularities are separated in the 'auroral' and 'polar' maxima. There is a very strong Kp dependence even for the lowest Kp-indices. (Author)

Descriptors :   (*IONOSPHERE, ELECTRON DENSITY), (*ELECTRON DENSITY, POLAR REGIONS), MAGNETOOPTICS, SCINTILLATION, IONOSPHERIC DISTURBANCES, SUNSPOTS, IONS, ANOMALIES, NORWAY

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE