Accession Number : AD0676030

Title :   FAST TEMPORAL AND SPATIAL CHANGES IN AURORAS.

Descriptive Note : Scientific rept.,

Corporate Author : ALASKA UNIV COLLEGE GEOPHYSICAL INST

Personal Author(s) : Cresswell,George R.

Report Date : FEB 1968

Pagination or Media Count : 190

Abstract : Several types of pulsing and fast-moving auroras were examined with photometers and television systems. Pulsating auroras were seen to be restricted primarily to the equatorward boundary of the auroral display in the midnight and morning sectors following substorm onsets. Flaming auroras appear to occur under the same conditions as pulsating auroras and, in fact, pulsating auroras have sometimes been observed to flame. Flickering auroras were occasionally observed as part of bright discrete features seen before midnight on active days. They were made up of numerous small patches, 1-2 km across, each of which underwent rapid (about 10 cps) changes of size, shape, and intensity. Fast auroral waves are east-west aligned, arc-like features that were seen to propagate southward at 50-300 km/sec and at about once per second in the College vicinity after midnight. (Author)

Descriptors :   (*AURORAE, SCIENTIFIC RESEARCH), (*IONOSPHERIC DISTURBANCES, ELECTROMAGNETIC RADIATION), GEOMAGNETISM, PERIODIC VARIATIONS, MAGNETOSPHERE, POWER SPECTRA, ELECTRONS, TELEVISION DISPLAY SYSTEMS, PHOTOMETERS, ALASKA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE