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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 7
Ann. Geophys., 25, 1569-1577, 2007
https://doi.org/10.5194/angeo-25-1569-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1569-1577, 2007
https://doi.org/10.5194/angeo-25-1569-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jul 2007

30 Jul 2007

Low latitude ionosphere-thermosphere dynamics studies with inosonde chain in Southeast Asia

T. Maruyama1, M. Kawamura1, S. Saito1, K. Nozaki1, H. Kato1, N. Hemmakorn2, T. Boonchuk2, T. Komolmis3, and C. Ha Duyen4 T. Maruyama et al.
  • 1National Institute of Information and Communications Technology, 2-1 Nukui-kita 4-chome, Koganei, Tokyo, 184-8795 Japan
  • 2Department of Telecommunications, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, 3-2, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
  • 3Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Chiangmai 50200, Thailand
  • 4Institute of Geophysics, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet Str., Cau Giay, Hanoi, Vietnam

Abstract. An ionosonde network consisting of a meridional chain and an equatorial pair was established in the Southeast Asian area. Three of four ionosondes are along the magnetic meridian of 100° E; two are close to the magnetic conjugate points in Northern Thailand and West Sumatra, Indonesia, and the other is near the magnetic equator in the Malay Peninsula, Thailand. The fourth ionosonde is also near the magnetic equator in Vietnam but separated by about 6.3° towards east from the meridional chain. For a preliminary data analysis, nighttime ionospheric height variations at the three stations of the meridional chain were examined. The results demonstrate that the coordination of the network has a great potential for studying ionosphere/thermosphere dynamics. Through the assistance of model calculations, thermospheric neutral winds were inferred and compared with the HWM93 empirical thermospheric wind model. Higher-order wind variations that are not represented in the empirical model were found.

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