Accession Number : AD0610919

Title :   THE DIURNAL PERIODICITY OF AURORA WITHIN THE MAXIMUM-FREQUENCY ZONE,

Corporate Author : DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)

Personal Author(s) : Isaev,S. I.

Report Date : AUG 1960

Pagination or Media Count : 7

Abstract : Three types of auroral diurnal variations are defined. The first and most simple type, having a single night maximum, is observed in the outer zone, that is, up to about 70 degrees of geomagnetic latitude. The second and more complicated type, exhibiting a secondary morning maximum, prevails in the region between 70 and 78 degrees of geomagnetic latitude, that is, in the transitional zone of magnetic disturbance. The third type, with an unstable or indeterminate diurnal variation, is observed beyond 78 degrees of geomagnetic latitude, that is, in the inner zone of magnetic disturbance. The boundaries between these zones, it seems, do not run strictly according to geomagnetic latitude but have a somewhat oval form.

Descriptors :   (*AURORAE, DIURNAL VARIATIONS), PERIODIC VARIATIONS, GEOMAGNETISM, MAGNETIC STORMS, ARCTIC REGIONS, USSR

Distribution Statement : APPROVED FOR PUBLIC RELEASE