NORTHERN LATITUDE PROPAGATION

Satellite recordings made at Kiruna Geophysical Observatory at frequencies 20 and 54 Mc/s during the last three years are investigated with respect to the occurrence of scintillation with emphasis on the 54 Mc/s results. Studies of diurnal and seasonal variations of scintillation at 54 Mc/s show tha...

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Bibliographic Details
Main Author: Liszka, Ludwik
Other Authors: KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
Format: Text
Language:English
Published: 1963
Subjects:
Atmospheric Physics
Radiofrequency Wave Propagation
Radio Communications
*MAGNETOOPTICS
*SATELLITE COMMUNICATIONS
*RADIO SIGNALS
*DISTORTION
*DIURNAL VARIATIONS
*IONOSPHERIC SCINTILLATION
GEOMAGNETISM
SWEDEN
PERIODIC VARIATIONS
ARTIFICIAL SATELLITES
FOREIGN REPORTS
Kiruna
Online Access:http://www.dtic.mil/docs/citations/AD0402303
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0402303
Description
Summary:Satellite recordings made at Kiruna Geophysical Observatory at frequencies 20 and 54 Mc/s during the last three years are investigated with respect to the occurrence of scintillation with emphasis on the 54 Mc/s results. Studies of diurnal and seasonal variations of scintillation at 54 Mc/s show that the shape of the diurnal curve is dependent on magnetic activity and that seasonal variations are not important. The depth of scintillation at 54 Mc/s is better correlated with magnetic activity than at 20 Mc/s. There exists a difference between daytime and night-time scintillation. A statistical analysis of the diffraction pattern produced by radio waves from Transit IV A at 54 Mc/s is also presented. The most important result is the evidence that auroral zone scintillation may be produced at altitudes below F-maximum. Investigation of the shape of ionospheric Irregularities have shown that if these are assumed to be two-axial ellipsoids orientated along the magnetic field lines, axis ratios of order of magnitude 10 will be obtained.

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