Computer Science
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1007s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, July 1991, p. 1007-1015.
Computer Science
Ionospheric Drift, Sporadic E Layer, Temperate Regions, Traveling Ionospheric Disturbances, Data Smoothing, Diurnal Variations, Ground Stations, Ionograms
Scientific paper
Horizontal motions of temperature zone winter daytime Es ionization have been investigated using ionogram film records obtained from an array of three spaced ionosondes. Apparent drift velocities were deduced for individual Es events by considering the cross-correlations between stations of the measured ionosonde frequency parameters. The average Es drift velocity was found to be equatorward with a speed of 90 m/s. The velocity distributions obtained were composed of two groups: one group with velocities of 140 + or - 21 m/s toward the equator considered to be due to the presence of travelling ionospheric disturbances propagating through the Es layer; and a lower group with velocities of 40 + or - 2 m/s also toward the equator, interpreted as due to the motion of each Es layer as a whole. Horizontal motions of each Es layer were found to average 57 + or - 7 m/s, which supports the hypothesis of a bulk neutral wind mechanism for the lower velocity group.
Baggaley William J.
Smith Marcia S.
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