Early morning effect on the F-region from ground station observations

Details Early morning effect on the F-region from ground station observations Early morning effect on the F-region from ground station observations

Jun 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..749i&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 6, pp. 749-750, IN1, 751-755

Physics

Scientific paper

Data from continuous vertical ionospheric recordings over Athens indicate that the morning effect on the F-region starts regularly earlier than the [latin small letter f with hook]0F2 predawn minimum as a rise of the virtual heights at fixed frequencies. The corresponding solar zenith angle undergoes a pronounced seasonal variation and presents a winter mean maximum value of 121°. The world-wide distribution of the predawn [latin small letter f with hook]0F2 minimum, taken from the prediction maps, and the day to day variation over Athens are examined and the results are discussed from the point of view of a possible magnetospheric contribution to the early morning phenomenon.

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