Correlation between foEs and zonal winds over Rome, Okinawa and Townsville using Horizontal Wind Model (HWM14) during solar cycle 22
2021
Abstract The relation between ionosonde critical frequency of ionospheric sporadic E-layer ( f o E s ) and disturbed zonal wind is studied over Okinawa (26.68°N, 128.15°E), Rome (41.98°N, 12.49°E) and Townsville (19.63°S, 146.8°E) during different solar activity years, 1987 (moderate), 1996 (low) & 2001 (high) (Okinawa and Townsville) and 1987 (moderate), 1995 (low) & 2000 (high) (Rome). The variation of monthly hourly medians of f o E s shows annual trend with maximum values in local summer. However, it does not show dependence on solar activity. The correlation is studied between median f o E s values and the zonal winds obtained from climatological Horizontal Wind Model (HWM14). The strong correlation coefficients obtained between the parameters suggest that HWM14 may be used as a proxy to predict the climatology of the sporadic layers. A more comprehensive study based upon the same procedure is planned in future.
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