On the diurnal variation of the E-region coherent HF echo occurrence

Details On the diurnal variation of the E-region coherent HF echo occurrence On the diurnal variation of the E-region coherent HF echo occurrence

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..570c&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 7, p. 570-582.

Physics

1

Scientific paper

We present a statistical study of the diurnal variations of the E-region backscatter occurrence observed by 15 SuperDARN radars over 3 years. The diurnal variation of echo occurrence observed by each radar is examined for three levels of geomagnetic activity. It is found that the E-region echo occurrence for individual radars exhibits very similar diurnal variations for low geomagnetic activity, with the differences between radars increasing with activity. This indicates that local processes become more important in the generation of the E-region echoes during disturbed periods. It is also shown that the majority of E-region backscatter structures take the form of diffuse echo bands rather than discrete echo patches, with the dominance of diffuse echoes increasing with activity. Finally, a hypothesis that the echo occurrence is controlled by the radar's coverage of the auroral oval is tested using the electron and ion oval models derived from the DMSP satellite observations.

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