Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1455k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Nov. 1984, p. 1455-1457, 1459-1462.
Physics
14
Backscattering, Gravity Waves, Radar Equipment, Radar Signatures, Sporadic E Layer, Very High Frequency Radio Equipment, Annual Variations, Diurnal Variations, Power Spectra
Scientific paper
Wave-like features in range seen on the range/time/intensity (RTI) records of VHF backscatter radars operating in the South of New Zealand are interpreted as being the signature of gravity waves propagating in an ionospheric sporadic-E layer. The data show that, during midsummer in particular, sporadic-E ionization which has been modified by the passage of a gravity wave can produce two distinct echo types: backscatter from field-aligned irregularities within the sporadic-E layer, probably generated by plasma waves, and a second type of echo resulting from energy backscattered from the surface of the sea after specular reflection in the ionosphere. The backscattering and reflecting region can exist at latitudes at least as low as 49 degrees geographic (57 degrees geomagnetic) latitude during quiet magnetic conditions. It is confirmed that the patchiness of dense sporadic-E, and concluded that gravity waves at sporadic-E heights have amplitudes of the order of several tenths of a kilometer.
Andrews M. K.
Keys J. G.
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