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

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

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..946k&link_type=abstract

Annales Geophysicae, vol. 13, Issue 9, pp.946-953

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

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. Acknowledgements. I thank D. R. McDiarmid of the Herzberg Institute of Astrophysics, National Research Council, Canada, for important ideas and discussions during the development of this work. I thank the referees for useful comments which have improved the paper. I also thank E.M. Poulter of NIWA for helpful suggestions, and for reading the manuscript and making useful comments. The work was supported by contract CO1309 of the New Zealand Foundation for Research, Science and Technology. Topical Editor C.-G. Fälthammar thanks K. Mursula and W. J. Hughes for their help in evaluating this paper.--> Correspondence to: W. Allan-->

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