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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 11
Ann. Geophys., 24, 2991-2996, 2006
https://doi.org/10.5194/angeo-24-2991-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 2991-2996, 2006
https://doi.org/10.5194/angeo-24-2991-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Nov 2006

21 Nov 2006

Ionospheric height variations observed by ionosondes along magnetic meridian and plasma bubble onsets

S. Saito and T. Maruyama S. Saito and T. Maruyama
  • National Institute of Information and Communications Technology, Nukui-kita 4-2-1, Koganei, Tokyo 183-8795, Japan

Abstract. Since October 2004, a Frequency Modulated–Continuous Wave (FM–CW) ionosonde chain along the magnetic meridian has been operating in Southeast Asia, in Kototabang (0.2° S, 100.3° E), Indonesia, Chumphon (10.7° N, 99.4° E), Thailand, and Chiang Mai (18.8° N, 98.9° E), Thailand. Variations in the virtual height of the bottomside of the F-region (h'F) at 2.5 MHz were analyzed, in order to study the day-to-day variability of plasma bubble occurrence for the periods of October 2004 and March–April 2005. When plasma bubbles were generated, h'F was enhanced at the three stations. However, even when h'F at the equatorial station, Chumphon, was largely enhanced, plasma bubbles were not generated when a noticeable north-south asymmetry of h'F existed. This asymmetry could be attributed to the transequatorial thermospheric wind. Our results show that the strong transequatorial thermospheric wind can suppress the plasma bubble generation and is one of the important factors which controls the day-to-day variability of plasma bubble occurrences.

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