Highlights SDC peak power decreases during local winter with no azimuthal dependence. SDC peak power increases with increasing sunspot number. SDC width and inbound Doppler shift increase during the equinoxes. SDC width and inbound Doppler shift increase from North to West. SDC width is strongly dependent on sunspot number only during equinoxes.
Abstract Mean night-time peak power, Doppler shift and Doppler width of spread Doppler clutter (SDC) received by a high frequency backscatter radar located at Alice Springs, Australia from 2000 to 2018 is presented as a function of azimuth, sunspot number, time of year and frequency. The sampled region covers 90 degrees from West to North and includes the northern and southern equatorial anomalies. SDC peak power diminished across all azimuths during the winter solstice from around May to August (local winter) coinciding with the global decrease in F layer density due to the annual non-seasonal F2 anomaly but was generally constant during the equinoxes. In contrast, SDC Doppler width and inbound Doppler shift both increased during the equinoxes and exhibited azimuthal dependence related to the eastward equatorial plasma drift. SDC peak power increased with increasing sunspot number with frequency dependence during winter but not summer. Inbound Doppler shift and Doppler width increased with increasing sunspot number during equinox but not solstice with a strong dependence on azimuth and a weak dependence on frequency.
Doppler characteristics of HF spread Doppler clutter recorded at Alice Springs, Australia
Advances in Space Research ; 67 , 3 ; 1026-1038
2020-10-27
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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