Abstract
A localised co-rotating auroral absorption event observed near noon using imaging riometer and EISCAT
Highlights
Observations of the high-latitude D region using the EISCAT incoherent-scatter radar facility have been gathered for more than a decade
Several of the EISCAT studies have compared the radio absorption observed by wide-beam riometers with that calculated from the radar measurements of D-region electron density
A long-lived ('2 h), localised radio absorption feature has been observed near local noon by the 49-beam imaging riometer at Kilpsjarvi
Summary
Observations of the high-latitude D region using the EISCAT incoherent-scatter radar facility have been gathered for more than a decade now. Several of the EISCAT studies have compared the radio absorption observed by wide-beam riometers with that calculated from the radar measurements of D-region electron density. We anticipate a range of studies using joint EISCAT and IRIS data (Collis and Hargreaves, 1996) These are likely to include significant contributions to (a) geophysical investigations based on, for example, rocket, satellite or ground-based campaigns, where the radar data will be able to be set firmly within the context of the spatial distributions of energetic particle precipitation, (b) synoptic studies relating radio absorption to D-region electron density, by virtue of the narrow IRIS beam widths, and (c) detailed case-studies based principally on EISCAT and IRIS data alone. This was a relatively weak, featureless daytime absorption event as measured by broad-beam riometer, but which turned out to have many interesting characteristics when studied with IRIS and EISCAT data together
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