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Studies of Early Night Equatorial Spread F Over Jicamarca

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We use Jicamarca JULIA and incoherent radar observations from 1996 to 2006 to study the initial development of equatorial spread F over Jicamarca. We show that the times of initial spread F occurrence do not change with solar flux, but their altitudes increase from about 280 km to400 km from solar minimum to solar maximum. The times of initial plumes occurrence decrease with increasing solar flux during both equinox and December solstice. The altitudes of the onset of the early night radar plumes also increase with solar flux and is greater in December solstice than during equinox. The initial upward drift velocity at the time and height of initial spread F echoes increases from solar minimum to solar maximum and is approximately proportional to the maximum prereversal drift velocity.


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