VHF amplitude scintillations and associated electron content depletions as observed at Arequipa, Peru

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Equatorial Atmosphere, Ionospheric Electron Density, Scintillation, Very High Frequencies, Annual Variations, Depletion, Diurnal Variations, Solar Activity

Scientific paper

Observations of ionospheric scintillations and associated electron depletions made at Arequipa, Peru are reported. An analysis was made of the morphology of the irregularity patches and electron content depletion and their dependence on season. The measurements were made at 137 MHz VHF wavelength, and maximum scintillation was observed in December, while a minimum was present in May-June. Average scintillation events lasted 6 hr in December. The electron depletions lasted 10-15 min and reached an amplitude of less than 5 x 10 to the 16th electron/sq m, although excursions beyond that figure were sometimes observed. Post-midnight VHF scintillations with a spread-F frequency were associated with years of high solar activity.

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