NORTHERN LATITUDE PROPAGATION
KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
Pagination or Media Count:
Satellite recordings made at Kiruna Geophysical Observatory at frequencies 20 and 54 Mcs during the last three years are investigated with respect to the occurrence of scintillation with emphasis on the 54 Mcs results. Studies of diurnal and seasonal variations of scintillation at 54 Mcs 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 Mcs is better correlated with magnetic activity than at 20 Mcs. 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 Mcs 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.
- Atmospheric Physics
- Radiofrequency Wave Propagation
- Radio Communications