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Observations of omega bands using an imaging riometer.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>6/11/2009
<mark>Journal</mark>Annales Geophysicae
Issue number11
Number of pages13
Pages (from-to)4183-4195
<mark>Original language</mark>English


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.