E-region bifurcation and magnetic field related Bragg backscattered spectral events observed at high-latitude by MF radar

Details E-region bifurcation and magnetic field related Bragg backscattered spectral events observed at high-latitude by MF radar E-region bifurcation and magnetic field related Bragg backscattered spectral events observed at high-latitude by MF radar

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223814m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 23, CiteID L23814

Physics

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Instruments And Techniques

Scientific paper

We report on novel spectral characteristics of E-region backscatter acquired using a 1.94 MHz Medium Frequency (MF) radar above the high-latitude Antarctic station Davis (68.6°S). Two distinctive Doppler spectra are observed: one that exhibits bifurcation in Doppler velocity (or frequency) with one, or occasionally more, near symmetrical spectral side-bands (here labelled SSE); and a second that exhibits broad-band spectra related to the magnetic field topology (here labelled FRE). Both spectral forms reveal a characteristic quasi-hyperbolic spectral form that diverges in Doppler velocity with range. We discuss the properties of these two spectral forms including: Doppler spectral shape; power spectra; angle-of-arrival (AOA) of backscattered sources; and their diurnal and day-to-day occurrence distributions for our campaign interval. Interestingly, the E-region SSE observed at a height near 100 km were observed coincidentally with D-region polar mesosphere summer echoes (PMSE) in the height range 82-92 km, when colocated data were available.

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