Abstract
A procedure is developed to derive the vertical phase and group velocities of waves from measurements of ionograms. We apply the developed procedure to a sequence of ionograms recorded by the digisonde portable sounder in Taiwan and find numerous waves occuring in the ionosphere during the solar eclipse of 24 October 1995. A detailed analysis of an 87-min period wave shows that the vertical phase velocities of the wave below and above the F1 ledge are about 100 m/s in the downward and upward directions, respectively. The associated group velocities below and above the ledge are found to be about 10 m/s in the downward and upward directions, respectively, which indicates that during the solar eclipse the wave source is near the F1-ledge.
Original language | English |
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Pages (from-to) | 1679-1686 |
Number of pages | 8 |
Journal | Journal of Atmospheric and Solar-Terrestrial Physics |
Volume | 60 |
Issue number | 17 |
DOIs | |
State | Published - 15 Nov 1998 |