On the occurrence of equatorial spread-F in the evening hours |
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| Affiliation: | 1. University of Sofia, Faculty of Physics, Department of Atomic Physics, 5 James Bourchier Blvd., 1164, Sofia, Bulgaria;2. Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, 1113, Sofia, Bulgaria;1. School of Electronic Information, Wuhan University, 430072 Wuhan, Hubei, China;2. Institute of Earthquake Science, China Earthquake Administration, 100036 Beijing, China;1. Frederick Research Center, Nicosia, Cyprus;2. Frederick University, Nicosia, Cyprus;3. IZMIRAN, Troitsk, Moscow 108840, Russia |
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| Abstract: | By comparing electron drift velocities at Jicamarca with corresponding ionograms and VHF radio scintillation records at Huancayo it has been shown that the day-to-day variability in the occurrence of equatorial spread-F irregularities in the post-sunset period depends critically on the time of reversal of the Sq electric field. The field reversal before sunset does not produce any spread-F in the evening hours, while the continuation of the day-time electric field for a couple of hours after sunset at normal strength is a favourable condition for generating spread-F. |
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