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5MHZ 6000 SLANT RANGE absorption aircraft algorithm altitude antenna auroral oval average azimuth backscatter ionograms barrier Buchau clutter range Coast Radar System coronal mass ejections Dandekar dip latitude Doppler shift earth's East Coast Radar electron density equatorial clutter F region F-layer fJF2 foF2 Frequency of occurrence geomagnetic storms ground clutter ground range high and low HIGH LOW HIGH high solar activity improvement interval IONCAP ionization ionosonde layer LOW HIGH LOW low solar activity magnetic field maximum modified slope method noise occurrence with slant OTH radar percent periods for beam Phillips Laboratory plasma polar cap radar cross section radio wave range of clutter raytraces refraction scatter season for high shows SLANT RANGE NM SOLAR ACTIVITY OBS solar activity periods solar filaments solar flares solar wind sunset sunspot number Table target signal transmitted typical variation vertical virtual height WCRS winter