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Observations of small- to large-scale ionospheric irregularities associated with plasma bubbles with a transequatorial HF propagation experiment and spaced GPS receivers
National Institute of Information and Communications Technology, Koganei, Japan
National Institute of Information and Communications Technology, Koganei, Japan
National Institute of Information and Communications Technology, Koganei, Japan
National Institute of Information and Communications Technology, Koganei, Japan
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Hanoi Institute of Geophysics, Vietnamese Academy of Science and Technology, Hanoi, Vietnam
Hanoi Institute of Geophysics, Vietnamese Academy of Science and Technology, Hanoi, Vietnam
The results from simultaneous observations of the nighttime transequatorial propagation (TEP) of HF radio waves between Australia and Japan and the GPS scintillation measurements in south China and Vietnam are presented in this paper. The results showed that there was good correspondence between the nighttime eastward traveling off–great circle propagation (OGCP) of broadcasting waves of Radio Australia from Shepparton, Australia, measured at Oarai, Japan, and the scintillations in GPS radio waves at Hainan, China. This shows that the nighttime eastward traveling OGCP in HF TEP is caused by a large-scale ionospheric structure associated with a plasma bubble. The zonal drift velocities of the large-scale ionospheric structure estimated by the change in the direction of arrival of the OGCP were similar to those of the small-scale irregularities associated with plasma bubbles measured by the GPS scintillation spaced-receiver technique. Our results show that the HF TEP measurement is quite useful for monitoring the plasma bubble occurrence over a wide area and for forecasting the arrival of the plasma bubble at places located to the east of it.
Received 7 March 2008; accepted 8 October 2008; published 30 December 2008.
Citation: (2008), Observations of small- to large-scale ionospheric irregularities associated with plasma bubbles with a transequatorial HF propagation experiment and spaced GPS receivers, J. Geophys. Res., 113, A12313, doi:10.1029/2008JA013149.
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