Low-altitude quasi-periodic echoes studied using a large database of Gadanki radar observations

Details Low-altitude quasi-periodic echoes studied using a large database of Gadanki radar observations Low-altitude quasi-periodic echoes studied using a large database of Gadanki radar observations

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11401313v&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A1, CiteID A01313

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1

Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Equatorial Ionosphere, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

In this paper we present studies on low-altitude quasiperiodic (LQP) echoes based on a large database of Gadanki radar observations. LQP echoes have been observed 33% of the time during daytime and 39% during nighttime. Their occurrence is found to be maximum in the summer (daytime, 58% nighttime, 57%), followed by the September equinox (daytime, 32% nighttime, 48%), the March equinox (daytime, 26% nighttime, 36%), and minimum in the winter (daytime, 25% nighttime, 26%). Height-time occurrence of LQP echoes shows two local time maxima: one in the morning (0700-1100 LT) and another in the evening (1900-0000 LT). The most significant results not reported earlier are the large occurrence rate of LQP echoes and the height-time occurrence maps showing a descending pattern with close resemblance to tidal wind behavior. The Doppler velocities are upward-northward (downward-southward) for positive- (negative-) sloped LQP echoes. Also, we find the Doppler spread as high as 200 m s-1 at times underlining the presence of strong plasma turbulence in the collision-dominated lower E region. These results are discussed in the light of the current understanding of the LQP echoes.

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