Accession Number : AD0284205

Title :   TIME VARIATION OF AURORAL LIGHT EMMISSION DOWN TO PERIODS OF ABOUT 200 MICROSECONDS

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : GUSTAFSSON,GEORG

Report Date : 15 MAY 1962

Pagination or Media Count : 1

Abstract : A photometer has been constructed with an effective aperture area of 7000 sq cm for registration of rapid amplitude variations of the auroral light emission. With this instrument it has been possible to measure intensity variations in the blue part of the auroral spectrum down to periods of about 200 microseconds. The average power spectrum had the following characteristics: The intensity of 10 cps was 10%, 100 cps - 1% and at 2000 cps - 0.1% of the dcintensity. The persistence of the irregularities in the frequency range 0.2-4 kc/s in the spectra could be of the order of one second but were usually shorter. (Author)

Descriptors :   *AURORAE, *PHOTOMETERS, INSTRUMENTATION, INTENSITY, LIGHT, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE