I am carrying out an investigation on plasma drift during the evening time, I observed that the average PRE magnitude for a complete solar cycle during the June solstice (covering May to July) peaked an hour after all other seasons had peaked. What could be responsible?
The PRE magnitude which peaked an hour later in June solstice than for other seasons could have been as a consequence of the decrease in the equatorial zonal wind and conductivity gradient. The decrease causes delay in the zonal drift reversal, and as such the PRE peak during this season is dragged further into additional time.
The PRE is related to the ionosphric dynamo which is related to neutral wind. The neutral wind have seasonal variations, so it it is normal the PRE depends also of the season
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