Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303104p&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 3, CiteID L03104
Physics
11
Ionosphere: Electric Fields (2712), Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities (2772)
Scientific paper
We present systematic observations of daytime 150-km echoes from Gadanki (13.5° N, 79.2° E, 6.3° dip latitude). The echoing region is confined to 142-162 km altitude and show forenoon descent and afternoon ascent displaying a `necklace shape' quite similar to that of the equatorial 150-km echoes. Signal-to-noise ratio, velocity and spectral width are as high as 13 dB above noise, -5 to 35 m s-1 and 2 to15 m s-1, respectively. The observed `necklace shape' is first of its kind from Gadanki and the present observations have almost all characteristics of equatorial daytime 150-km echoes. The Gadanki radar observations hence provide first experimental evidence on the occurrence of daytime 150-km echoes outside the equatorial electrojet belt.
Patra Amit Kumar
Rao Venkateswara N.
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