The study of variation of hmF2 at low latitude during declining phase of 24 solar cycle
Keywords:
hmF2, F2 ionospheric layer, variation of hmF2, 24 solar cycle, Solar radiation, Neutral winds and ionospheric electric fields influence, diurnal and seasonal variationAbstract
Variations of maximum height of F2 ionospheric layer are analysed over ionospheric station Austin (30ᵒ16′11″N 97ᵒ45′25″W) during year 2018. An analysis was performed on the hmF2 data collected at Austin Station during the 24 solar cycle's declining phase. Measurements made during several seasons are included in the database. The diurnal, monthly and seasonal variations of hmF2 are analyzed. We have derived hourly values of hmF2 (the real height corresponding to the peak electron density in the F2-region. The maximum height of F2 layer during the daytime show variation with the solar activity. It is higher during the higher activity periods and lower during the periods of low activity. Solar radiation, Neutral winds and ionospheric electric fields influence hmF2. For diurnal variation, the peak value of hmF2 is at 00:00 hrs (LT) and dips at 09:00 hrs (LT). In this paper, results showed that hmF2 in equinox is higher than in winter. During April hmF2 has maximum value and minimum in December. During nighttime value of peak height decreases and then increases.
Keywords: hmF2, Ionosphere, low latitude, diurnal and seasonal variation, 24 solar cycle.
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