The study of foF2 on low latitude over Cocos Island during the inclining phase of 25 solar cycle
Keywords:
foF2, Ionosphere, low latitude, diurnal and seasonal variation, 25th solar cycleAbstract
This paper presents the variability of foF2 during 2023 at Cocos Island (12° 11′ 13′′ S, 96° 49′ 42′′ E) at a low-latitude station. A statistical analysis was performed on the foF2 data collected at Cocos Island during the 25 solar cycle's inclining phase. We have examined the diurnal, monthly, and seasonal variations. The database contains measurements obtained throughout several seasons. In the present study, we investigated the daily, monthly, and seasonal variations using hourly values of foF2. According to the diurnal result, foF2 progressively drops from 15:00 (LT) to 23:00 (LT) and then rises from 06:00 (LT) to 15:00 (LT). Peak height values increase throughout the day and fall at night. The variations in foF2 are greatest during the Equinox and lowest during the summer. July exhibits the lowest variance in foF2, while October exhibits the greatest variation.
Keywords: foF2, Ionosphere, low latitude, diurnal and seasonal variation, 25th solar cycle.
References
Diabaté, A., Ouattara, F. And Zerbo, J.L. (2018) annual and diurnal variability in the critical frequency (foF2) during geomagnetic fluctuating activity over solar cycles 21 and 22 at ouagadougou. Atmospheric and climate sciences, 8, 435-445. https://doi.org/10.4236/acs.2018.84029
Khoobchandani G, Maski K & Vijay S K (2017), variability of foF2 at low latitude during high, moderate and low solar activity, international journal of engineering trends and technology (ijett) -- volume-44 number-2 -february 2017 issn: 2231-5381. https://doi.org/10.14445/22315381/IJETT-V44P211
Kouris S.S., Fotiadis D.N. and Xeno T.D. (1998), on the day-to-day variation of foF2 and m (3000) F2. Adv. Space rex. Vol. 22, no. 6, pp. 873-876, 1998. https://doi.org/10.1016/S0273-1177(98)00116-1
Rama Rao, P.V.S., Srirama Rao, M., Satyam, M. Diurnal and seasonal trends in tec values observed at waltair. Indian j. Radio space phys. 6, 233--235, 1977
Agrawal A, Maski K, Vijay S.K and Mishra S.D. (2018), an analytical study of nighttime enhancement in foF2 during 23rd& 24th solar cycle at low latitude station. International journal of engineering trends and technology (ijett ) -- volume 61 number 1 -- july 2018, issn: 2231 -- 5381. https://doi.org/10.14445/22315381/IJETT-V61P205
Bi, C., Ren, P.,Yin, T., Ang, Z and Zhang, Y. (2022) modeling and forecasting ionospheric foF2 variation in the low latitude region during low and high solar activity years. Remote sens. 2022, 14, 5418. https://doi.org/10.3390/rs14215418
Rishbeth H, the thermospheric circulation affects the ionospheric F2- layer. J.atmost . Solar phys. Vol. 60, no. 14, pp.1385-1402. https://doi.org/10.1016/S1364-6826(98)00062-5
Singh M, Sharma A, Maski K and Vijay S. K. (2024), study of geomagnetic activity effect on foF2 at low, mid and high latitude. Volume 12, issue 1 january 2024 issn: 2320- 2882
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