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

• 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

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)