A study of long-term climatology of ionospheric irregularities by using GPS phase fluctuations at the Brazilian longitudes |
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| Authors: | FD Chu CC Lee WS Chen JY Liu |
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| Institution: | 1. Institute of Space Science, National Central University, No. 300, Jhongda Road, Jhongli, Taoyuan 320, Taiwan;2. National Standard Time and Frequency Laboratory, Telecommunication Laboratories, Chunghwa Telecom Co. Ltd., No. 12, Lane 551, Min-Tsu Road Sec. 5, Yangmei, Taoyuan 326, Taiwan;3. General Education Center, Ching-Yun University, No. 229, Chienshin Road, Jhongli, Taoyuan 320, Taiwan;4. Center for Space and Remote Sensing Research, National Central University, No. 300, Jhongda Road, Jhongli, Taoyuan 320, Taiwan |
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| Abstract: | We have examined the ionospheric plasma irregularities that were recorded by using three ground-based receivers of the global positioning system (GPS) located at Brazilian longitudes during the period of a complete solar cycle, 1995–2005. The statistic results show that ionospheric irregularities are very easy to occur in December solstice months but rare to occur in June solstice months. Besides, the occurrence rates of irregularities in both December and June solstice months are little dependent on solar activity. However, in equinoctial months, the development of irregularities is obviously dependent on solar activity. There is a new finding in this study that if strong irregularities are distinguished from moderate ones, their occurrence rates would increase with solar activity during the December solstice months. |
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| Keywords: | Equatorial ionosphere Ionospheric disturbances Ionospheric irregularities |
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