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- W1998706657 abstract "Abstract In this report, the authors have used the ionospheric data obtained at Taipei during the period of July 1957–June 1968 to investigate the solar cycle, seasonal and diurnal changes of the effects of the geomagnetic activity on the occurrence of spread-F activity. The cross correlation analysis is also used to determine the correlation coefficients with time shifts up to 10 days. The results show that the spread-F activity is negatively correlated with the geomagnetic activity throughout the years under investigations except for the year of 1961; there are two types of spread-F activity: one is the equinoctial type which is used to occur during the high solar activity and has its seasonal activity peaks in equinoctial months and diurnal peak in 2200 LST; the other is the summer type which is used to occur during the low solar activity and has its seasonal activity peak in summer, and diurnal peak in 0200 LST. It is suggested that the equinoctial type is closely associated with the appearance of the postsunset peak of ƒ 0 F2 and is formed by the field aligned ionization irregularities caused by the fountain effect; and the summer type is formed by the ionization irregularities which are always existing in the topside ionosphere." @default.
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- W1998706657 date "1970-11-01" @default.
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- W1998706657 title "On the occurrence of spread-F and the geomagnetic activity over Taipei, Taiwan" @default.
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- W1998706657 doi "https://doi.org/10.1016/0021-9169(70)90134-0" @default.
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