Mathematics – Probability
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813751k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,751-13,760.
Mathematics
Probability
1
E Region, Ionospherics, Lunar Tides, Periodic Variations, Signal To Noise Ratios, Earth-Moon System, Fourier Analysis, Harmonics, Ionospheric Electron Density
Scientific paper
Fourteen consecutive years of 15-min scintillation index values observed in Lunping, Taiwan have been analyzed by the lunar age superposition method. Analysis covers 24 hrs/day and is performed separately for each of the four seasons. Statistically significant first and second lunar harmonics have been found at all seasons, but the largest and most significant occur in the summertime data. During the daytime the probability of scintillations at Lunping is significantly correlated with f(0)E(s). We conclude that our lunar harmonics probably result from the modulation, in the E region, of neutral winds of solar thermal origin by upward propagating lunar tides. The nighttime scintillations are larger and tidal neutral air velocities seem to play a role in the production mechanism(s). There is clear evidence for both the summertime temperate latitude type of scintillations observed in Japan and the scintillations, mainly equinoctial, arising from the equatorial bubble mechanism. Four distinct statistically significant summertime scintillation periods are found, plus one each in the autumnal and winter data. An attempt is made to identify the production mechanism associated with each.
Huang Yinn-Nien
Koster John R.
Lue H. Y.
Wu Hsi-Shu
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