DISTURBANCE DEPENDENCE OF THE SIGNAL STRENGTH FOR OBLIQUE 90 MC AURORAL REFLECTIONS

The distance dependence of signal strength for simultaneous oblique auroral reflections from three transmitter stations (Kemi on 92.8 mc, Ylivieska on 94.0 mc and Jyvaskyla on 92.2 mc was investigated. The stations were situated approximately in the same direction from Kiruna but at different distan...

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Bibliographic Details
Main Author: EGELAND,ALV
Other Authors: KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
Format: Text
Language:English
Published: 1961
Subjects:
*ATMOSPHERICS
*AURORAE
*ECHO RANGING
FREQUENCY MODULATION
RADIO RECEIVERS
RADIO SIGNALS
RADIO TRANSMITTERS
VERY HIGH FREQUENCY
Kiruna
Online Access:http://www.dtic.mil/docs/citations/AD0263901
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0263901
Description
Summary:The distance dependence of signal strength for simultaneous oblique auroral reflections from three transmitter stations (Kemi on 92.8 mc, Ylivieska on 94.0 mc and Jyvaskyla on 92.2 mc was investigated. The stations were situated approximately in the same direction from Kiruna but at different distances. The most important characteristics of the distance dependence of auroral reflections from the three transmitters is summarized. For less than 20% of the time for which reflections from Kemi (the nearest transmitter) were received, echoes were obtained simultaneously from the two other transmitters. The frequency of occurrence and the intensity of auroral echoes decreased rapidly with the distance between the receiver and transmitter. For a few, short periods, the echo intensity was greater for the Ylivieska transmitter than for Kemi, which is nearer to Kiruna. The fine structure of the auroral echoes were seldom identical or even similar for the three transmitters. (Author)

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