Oscillating echoes from the polar E layer

Details Oscillating echoes from the polar E layer Oscillating echoes from the polar E layer

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1162b&link_type=abstract

Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 1162-1164. Research supported by the Norges Almenvitenskapelige Forsk

Physics

E Region, Ionospheric Drift, Oscillations, Polar Regions, Radar Echoes, Signal Fading, Atmospheric Scattering, Drift Rate, Radiant Flux Density, Wave Reflection

Scientific paper

Radio waves with a frequency of 4 MHz transmitted vertically into the polar ionosphere and reflected in the E layer occasionally show very stable oscillations in intensity. This phenomenon, which occurs mainly in the evening sector under quiet conditions, has been studied at Ny-Alesund, Spitzbergen, by using a 4-MHz transmitter and four spaced receiving antennas. The observed oscillations can be explained as interference of waves reflected from a pair of enhanced ionization regions some 30 km apart and moving with a horizontal velocity of the order of 100 m/s. The low drift velocity is consistent with low magnetic activity.

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