Observations of omega bands using an imaging riometer.

Kavanagh, A.J. and Wild, J.A. and Honary, F. (2009) Observations of omega bands using an imaging riometer. Annales Geophysicae, 27 (11). pp. 4183-4195. ISSN 0992-7689

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Abstract

We present a case study of an omega band cur- rent system from 11 May 1998 using data from the Imaging Riometer for Ionospheric Studies (IRIS) in Finland. For the first time, images of a substorm-related omega band in cos- mic noise absorption are shown. The substorm in question was one of a string that occurred on that day; inspection of geostationary satellite data indicates that this was a sawtooth event. Using a previously established statistical relationship, the IRIS data is used to provide maps of Hall conductance and compared with previous estimates utilising both HF and VHF coherent-scatter radars. Discrepancies are discussed with reference to precipitation spectrum and the geometry of the experimental set-up. The imaging riometer data provides a higher spatial resolution than the combined magnetometer- radar pairing for determining the Hall conductance and can also be used to identify the extent of the precipitation in the absence of optical data.

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