Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 17495 10.12737/stp-3220177 Results of current research Results of current research Results of current research Diurnal, seasonal, annual, and semi-annual variations of ionospheric parameters at different latitudes in East Asian sector during ascending phase of solar activity Diurnal, seasonal, annual, and semi-annual variations of ionospheric parameters at different latitudes in East Asian sector during ascending phase of solar activity Ван Чжэн Wang Zheng zwang@spaceweather.ac.cn Ши Цзянькуй Shi Jiankui Ван Гоцзюнь Wang Guojun Ван Сяо Wang Xiao https://orcid.org/0000-0001-8966-4628 Жеребцов Гелий Александрович Zherebtsov Geliy Aleksandrovich solater@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Романова Елена Борисовна Romanova Elena Borisovna

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0002-0847-3553 Ратовский Константин Геннадьевич Ratovsky Konstantin Gennadyevich ratovsky@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Полех Неля Михайловна Polekh Nelya Mihaylovna polekh@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Национальный центр космических исследований КАН Пекин Китайская Республика National Space Science Center (NSSC) CAS Beijing Taiwan Национальный центр космических исследований КАН Пекин Китайская Республика National Space Science Center (NSSC) CAS Beijing Taiwan Университет КАН Пекин Китайская Республика University of CAS Beijing Taiwan Национальный центр космических исследований КАН Пекин Китайская Республика National Space Science Center (NSSC) CAS Beijing Taiwan Национальный центр космических исследований КАН Пекин Китайская Республика National Space Science Center (NSSC) CAS Beijing Taiwan Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 3 2 43 50 https://zh-szf.ru/en/nauka/article/17495/view

We analyzed ionospheric parameters including the critical frequency of the F2 layer (foF2), the peak height of the F2 layer (hmF2), and the scale height at hmF2 (HT) from 2006 to 2012 (ascending phase of solar activity) at Hainan (19.5° N, 109.1° E, MLat. 9.7° N), Irkutsk (52.4° N, 104.3° E, MLat. 42.5° N), and Norilsk (69.2° N, 88.0° E, MLat. 59.8° N) stations (low, middle and high latitudes). We have used manual scaled digisonde ionogram data. Studies of foF2 and hmF2 di-urnal-seasonal variations continue those made earlier for East Asia. Features peculiar for the ascending phase of solar activity are mostly consistent to those for de-scending phase, except for the features of sunset and nighttime hmF2 variations. Features of annual and semi-annual variations recorded by a digisonde agree with those obtained by a satellite occultation and TEC map. We also obtained seasonal, diurnal, annual, and semi-annual variations of the ionospheric parameter HT (scale height at hmF2) from digisonde data, which differ from foF2 variations and hmF2 features.

We analyzed ionospheric parameters including the critical frequency of the F2 layer (foF2), the peak height of the F2 layer (hmF2), and the scale height at hmF2 (HT) from 2006 to 2012 (ascending phase of solar activity) at Hainan (19.5° N, 109.1° E, MLat. 9.7° N), Irkutsk (52.4° N, 104.3° E, MLat. 42.5° N), and Norilsk (69.2° N, 88.0° E, MLat. 59.8° N) stations (low, middle and high latitudes). We have used manual scaled digisonde ionogram data. Studies of foF2 and hmF2 di-urnal-seasonal variations continue those made earlier for East Asia. Features peculiar for the ascending phase of solar activity are mostly consistent to those for de-scending phase, except for the features of sunset and nighttime hmF2 variations. Features of annual and semi-annual variations recorded by a digisonde agree with those obtained by a satellite occultation and TEC map. We also obtained seasonal, diurnal, annual, and semi-annual variations of the ionospheric parameter HT (scale height at hmF2) from digisonde data, which differ from foF2 variations and hmF2 features.

 ionosphere at different latitudes diurnal-seasonal variations annual and semi-annual variations solar activity ionospheric parameters East Asian sector. ionosphere at different latitudes diurnal-seasonal variations annual and semi-annual variations solar activity ionospheric parameters East Asian sector.

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