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Type: Journal article
Title: E-region bifurcation and magnetic field related Bragg backscattered spectral events observed at high-latitude by MF radar
Author: Morris, Ray James
Holdsworth, David Andrew
Murphy, Damian J.
Monselesan, D. M.
Citation: Geophysical Research Letters, 2005; 32(23):23814-23814
Publisher: American Geophysical Union
Issue Date: 2005
ISSN: 0094-8276
School/Discipline: School of Chemistry and Physics : Physics and Mathematical Physics
Statement of
R. J. Morris, D. A. Holdsworth, D. J. Murphy and D. M. Monselesan
Abstract: 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.
DOI: 10.1029/2005GL024429
Appears in Collections:Physics publications

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