Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..497c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, Apr. 1978, p. 497-502. Research supported by the Australian Research G
Physics
Doppler Effect, Ionospheric Disturbances, Ionospheric Propagation, Solar Eclipses, Australia, E Region, F Region, High Frequencies, Sporadic E Layer
Scientific paper
Observations of the Doppler shift of HF transmissions on 2.5 MHz and 4.5 MHz propagated via the ionosphere during the 23 October, 1976 eclipse over south-eastern Australia are reported. The 4.5 MHz signal, reflected from the F-region, showed the characteristic frequency shift attributable to recombination and/or motion of the reflection height after first contact. Spreading of the Doppler signal occurred after totality. Some wave activity was present in the record which is normal for this time of day. The 2.5 MHz observations showed little activity up to totality when sporadic E conditions set in, masking the detection of the response of the normal E-region to the eclipse.
Cornelius D. W.
Essex Elizabeth A.
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