fig02.htm

Figure 2. (a) index of Dst geomagnetic activity for October 13-18, 1999 (286 to 289th days); (b) critical frequency variations for layer F2 as recorded by the Point Arguello ionosphere measurement site, 32.17oN; 249.27oE; (c) variations of the critical frequency of the Es layer as recorded by the Point Arguello ionosphere measurement (32.17oN; 249.27oE); (d) variations of the absolute vertical TEC I0(t) value obtained from the IONEX data of the EMRG Laboratory for the latitude of 35oN and the longitude of 245oE; the average I0(t) values correspond to the position of the bars centers, the RMS values to their vertical sizes; (e) the seismic activity in the area of the earthquake epicenter, the triangle showing the main shock with a magnitude of 7.1. Shown below the figure is the local time (LT) scale for the longitude of 240oE.


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