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Monitoring global traveling ionospheric disturbances using the worldwide GPS network during the October 2003 storms

Monitoring global traveling ionospheric disturbances using t...

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中国科学院地质与地球物理研究所2007学术年会

作者：王敏 Division of Geomagnetism and Space Physics Institute of Geology and GeophysicsChinese Academy of Sciences Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

The global traveling ionospheric disturbances(TIDs) during the drastic magnetic storms of October 29-31, 2003 were analyzed using the Global Position System(GPS) total electron content(TEC) data observed in the Asian-Australian,European and North American *** collected the most comprehensive set of the TEC data from more than 900 GPS stations on the International GNSS Services(IGS) website and introduce here a strategy that combines polynomial fitting and multi-channel maximum entropy spectral analysis to obtain TID *** results of our study are summarized as follows:(1) large-scale TIDs(LSTIDs) and mediumscale TIDs(MSTIDs) were detected in all three sectors after the sudden commencement(SC) of the magnetic storm,and their features showed longitudinal and latitudinal *** duration of TIDs was longer at higher latitudes than at middle latitudes,with a maximum of about 16 *** TEC variation amplitude of LSTIDs was larger in the North American sector than in the two other *** the lower latitudes,the ionospheric perturbations were more complicated,and their duration and amplitude were relatively longer and larger.(2) The periods and phase speeds of TIDs were different in these three *** Europe,the TIDs propagated southward;in North America and Asia,the TIDs propagated southwestward;in the near-equator region,the disturbances propagated with the azimuth(the angle of the propagation direction of the LSTIDs measured clockwise from due north with 0°) of 210°showing the influence of Coriolis force;in the Southern Hemisphere,the LSTIDs propagated conjugatedly *** the southwestward and northeastward propagating LSTIDs are found in the equator *** results mean that the Coriolis effect cannot be ignored for the wave propagation of LSTIDs and that the propagation direction is correlated with polar magnetic activity.

关键词： Traveling ionospheric disturbances Global Positioning System gravity wave total electron content.

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