SUNRISE AND SUNSET EFFECTS ON COSMIC NOISE ABSORPTION ASSOCIATED WITH AURORA AND MAGNETIC STORMS

The riometer recordings taken at Kiruna during the period September 1958 through 1961 were investigated with respect to variation of auroraltype absorption during twilight periods. The average A sub D/A sub N ratio, i.e., that between post- and pre-twilight absorption at sunrise, and between pre- an...

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Bibliographic Details
Main Author: HULTQVIST,BENGT
Other Authors: AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Format: Text
Language:English
Published: 1962
Subjects:
*EXTRATERRESTRIAL RADIO WAVES
*IONOSPHERE
ABSORPTION
AURORAE
DIURNAL VARIATIONS
MAGNETIC STORMS
Kiruna
Lambda
Online Access:http://www.dtic.mil/docs/citations/AD0286294
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0286294
Description
Summary:The riometer recordings taken at Kiruna during the period September 1958 through 1961 were investigated with respect to variation of auroraltype absorption during twilight periods. The average A sub D/A sub N ratio, i.e., that between post- and pre-twilight absorption at sunrise, and between pre- and p st-twilight values at sunset, over the entire period has been found to be 1. 1-1. 2. This value is much lower than that which could be expected (about 3) on the basis of the most recently proposed height distributions of lambda = (negative ion density)/(electron density). It is concluded that the lambda distributions should be decreased so that even the night profile of lambda would have the value 1 at an altitude of about 60 kms. (Author)

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