Case studies of the propagation characteristics of auroral TIDS with EISCAT CP2 data using maximum entropy cross-spectral analysis |
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Authors: | S Y Ma K Schlegel J S Xu |
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Institution: | (1) Max-Plank-Institut für Aeronomie, D-37189 Katlenburg-Lindau, Germany;(2) Dept. of Space Physics, Wuhan University, Wuhan, 430072, China |
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Abstract: | In this paper case studies of propagation characteristics of two TIDs are presented which are induced by atmospheric gravity waves in the auroral F-region on a magnetic quiet day. By means of maximum entropy cross-spectral analysis of EISCAT CP2 data, apparent full wave-number vectors of the TIDs are obtained as a function of height. The analysis results show that the two events considered can be classified as moderately large-scale TID and medium-scale TID, respectively. One exhibits a dominant period of about 72 min, a mean horizontal phase speed of about 180 m/s (corresponding to a horizontal wavelength of about 780 km) directed south-eastwards and a vertical phase speed of 55 m/s for a height of about 300 km. The other example shows a dominant period of 44 min, a mean horizontal phase velocity of about 160 m/s (corresponding to a horizontal wavelength of about 420 km) directed southwestwards, and a vertical phase velocity of about 50 m/s at 250 km altitude.Max-Planck-Institut für Aeronomie, Germany. On leave from Department of Space Physics, Wuhan University, China |
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Keywords: | Ionosphere auroral ionosphere Ionosphere-atmosphere interactions wave propagation) |
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