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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 9
Ann. Geophys., 13, 946–953, 1995
https://doi.org/10.1007/s00585-995-0946-6
© European Geosciences Union 1995
Ann. Geophys., 13, 946–953, 1995
https://doi.org/10.1007/s00585-995-0946-6
© European Geosciences Union 1995

  30 Sep 1995

30 Sep 1995

Altitude integration effects in the skewness of type-2 coherent echoes

A. V. Kustov and M. V. Uspensky A. V. Kustov and M. V. Uspensky

Abstract. Possible effects of signal reception from different electrojet heights in a skewness of auroral coherent spectra are studied assuming that the "inherent" spectral line due to plasma turbulence is of type-2 and symmetrical. For reasonable ionospheric parameters, the altitude integrated spectra are expected to be skewed negatively for positive mean Doppler shift, in agreement with radar observations at small aspect angles. However, the spectra could be skewed positively if the turbulent layer or the electron density profile is shifted to high altitudes of ~120 km. This change of spectral shape will not be observed experimentally if, at the same time, either the electron collision frequency is enhanced or the "inherent" spectral width is increased. Observational results are discussed in view of the predictions given.

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