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Auroral radio emissions observed at harmonics of the electron cyclotron frequency (boxed in top panel).
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Direction of arrival resolved using 17-antenna array at Sondrestrom (contour plots with ISR radar scans superposed).
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ISR scans through the emission meridian allow determination of the source region via wave tracing.
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Electron density and magnetic field conditions in the source region were found to be critical inputs to the theory explaining the emissions.
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THughes, J.M., J. LaBelle, and J. Watermann, Statistical and case studies of auroral roar observed with a medium frequency interferometer, J. Geophys. Res., vol 106, p 21147, 2001.
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Hughes, J.M., and J. LaBelle, Joint incoherent scatter radar/medium frequency interferometer observations of auroral roar, J. Geophys. Res., vol 106, p 21157, 2001.
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Hughes, J.M., J. LaBelle, and M.L. Trimpi, A medium frequency interferometer for studying auroral radio emissions, Rev. Sci. Instr., vol 71, p 3200, 2000.
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