Abstract
This paper investigates the large scale travelling ionospheric disturbances (LSTIDs) using the observation data of an HF Doppler array located in Central China. The data observed in a high solar activity year (year 1989) are analyzed to obtain the main propagation parameters of LSTIDs such as period, horizontal phase velocity and propagating direction. Results are outlined as follows: Most of the LSTIDs propagate southward; others tend to propagate northward, mostly in summer; dispersion of most LSTIDs is matched with that of Lamb pseudomode, while others have the dispersion of long period gravity wave mode. The horizontal phase velocities of these two modes are about 220 and 450 m/s respectively. The analysis shows that LSTIDs are strongly pertinent to solar activity and space magnetic storms; thus the results presented here are significant for the research of ionospheric weather in mid-low latitude region.
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References
Chimonas, G., Hines, C. G., Atmospheric gravity waves launched by auroral currents, Planet. Space Sci., 1970, 565: 582.
Testud, J., Gravity waves generated during magnetic substorms, J. Atmos. Terr. Phys., 1970, 1793: 1805.
Thome, G., Long-period waves generated in the polar ionosphere during the onset of magnetic storms, J. Geophys. Res., 1968, 6319: 6336.
Titheridge, J. E., Nonperiodic irregularities in the ionosphere, J. Geophys. Res., 1971, 6955: 6960.
Hajkowicz, L. A., A global study of large scale travelling ionospheric disturbances (TIDs) following a step-like onset of auroral substorms in both hemispheres, Planet. Space Sci., 1990, 913: 923.
Hajkowicz, L. A., Global onset and propagation of large-scale travelling ionospheric disturbances as a result of the great storm of 13 March 1989, Planet. Spac. Sci., 1991, 583: 593.
Francis, S. H., Acoustic-gravity modes and large-scale travelling ionospheric disturbances of a realistic, dissipative atmosphere, J. Geophys. Res, 1973, 2278: 2301.
Richmond, A. D., The nature of gravity wave ducting in the thermosphere, J. Geophys. Res., 1978, 1385: 1389.
Wan, W., Yuan, H., Ning, B. et al., Regional properties of traveling ionospheric disturbances observed in Central China, Adv. Space Res., 2000, 219: 222.
Wan, W., Yuan, H., Ning, B. et al., Traveling ionospheric disturbances associated with the tropospheric vortexes around Qinghai-Tibet Plateau, Geophys. Res. Letters, 1998, 3775: 3778.
Wan, W., Yuan, H., Ning B., Statistical study for the spacial-temporal scale of ionospheric disturbances in middle China, Chinese Journal of Space Science, 1995, 301: 306.
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Tang, Q., Wan, W., Ning, B. et al. Properties of large-scale TIDs observed in central China. Sci. China Ser. A-Math. 45 (Suppl 1), 156–160 (2002). https://doi.org/10.1007/BF02889697
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DOI: https://doi.org/10.1007/BF02889697