E-region bifurcation and magnetic field related Bragg backscattered spectral events observed at high-latitude by MF radar
Date
2005
Authors
Morris, Ray James
Holdsworth, David Andrew
Murphy, Damian J.
Monselesan, D. M.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Geophysical Research Letters, 2005; 32(23):23814-23814
Statement of Responsibility
R. J. Morris, D. A. Holdsworth, D. J. Murphy and D. M. Monselesan
Conference Name
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.
School/Discipline
School of Chemistry and Physics : Physics and Mathematical Physics