Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1679l&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 17, p. 1679-1686.
Physics
12
Scientific paper
A procedure is developed to derive the vertical phase and group velocities of wavesfrom measurements of ionograms. We apply the developed procedure to a sequence of ionogramsrecorded by the digisonde portable sounder in Taiwan and find numerous waves occuring in theionosphere during the solar eclipse of 24 October 1995. A detailed analysis of an 87-min periodwave shows that the vertical phase velocities of the wave below and above the F1 ledgeare about 100 m/s in the downward and upward directions, respectively. The associated groupvelocities below and above the ledge are found to be about 10 m/s in the downward and upwarddirections, respectively, which indicates that during the solar eclipse the wave source is near the F1-ledge.
Hsiao Chiuder
Huang Chih-Meng
Kuo Fu-Shong
Liu Chang-Hong
Liu Ji-Yuan
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