Computer Science – Sound
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..565d&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, no. 6, June 1987, p. 565-567, 569-571.
Computer Science
Sound
1
Ionograms, Ionospheric Disturbances, Amplitudes, Ionospheric Sounding, Wavelengths
Scientific paper
A method is presented for determining the amplitude and vertical wavelength of ionospheric irregularities which produce distortions or perturbations in topside ionogram traces. The method is applied to several examples which give irregularity amplitudes ranging from 0.1 to 10 percent and vertical wavelengths from 40 to 300 km. From the examination of 2 years of data obtained by the Isis II topside sounder it was found that irregularities readily analyzed using this method were confined to the equatorial region. They are detected at approximately 1000-km altitude and above; however, they may exist below these altitudes, since it is shown that topside sounders are more sensitive to irregularities in regions where the ionospheric scale height is large. Their characteristics are consistent with their being part of the field-aligned or duct irregularity phenomenon, and their occurrence is consistent with the production mechanism suggested by Cole (1971).
Bennett Anthony. J.
Dyson Peter L.
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