Accession Number : AD0611326

Title :   VARIATIONS IN ENERGY SPECTRUM OF AURORAL ELECTRONS DETECTED BY SIMULTANEOUS OBSERVATION WITH PHOTOMETER AND RIOMETER,

Corporate Author : NORWEGIAN INST OF COSMIC PHYSICS OSLO

Personal Author(s) : Johansen,O. E.

Report Date : 1964

Pagination or Media Count : 25

Abstract : Limited to cases with homogeneous auroral forms covering most of the sky, observations at lambda 5577 A and 27.6 MHz show that the energy spectrum can remain constant for long periods, from half an hour to several hours and whole nights. Large and rapid variations do however occur, but less frequent than one could expect from satellite observations. This indicates that mary variations in electron energy spectrum observed by satellite borne instruments are variations in space rather than variations in time. An average over three winters show a diurnal variation in the energy spectrum with a hardening in the spectral shape between 20 and 01 local time. An unexpected high and variable light intensity corresponding to zero riometer absorption is also discussed. (Author)

Descriptors :   (*AURORAE, ATOMIC ENERGY LEVELS), ENERGY, ELECTRONS, EXCITATION, IONIZATION, LUMINESCENCE, ABSORPTION, DIURNAL VARIATIONS, MEASUREMENT, PHOTOMETERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE