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Ann. Geophys., 25, 1569-1577, 2007
www.ann-geophys.net/25/1569/2007/
© European Geosciences Union 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
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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