A simple model of the Auroral Kilometric Radiation visibility

Data collected with Polrad swept frequency analyzer during almost 2.5 years of Interball-2 mission are used to investigate the directivity properties of AKR observed in the Northern Hemisphere. In contrast with the previous, mostly statistical studies, single dynamic spectra have been analyzed. Simple modeling of AKR source visibility from the location of the observer makes possible to find approximate locations of remotely observed radiation sources and to model the overall form of the dynamic spectrum with a single set of geometric parameters valid during up to tens of minutes. Cases of filled and partially filled emission cones are found as well as smaller emission cones embedded in the main cone. Anisotropic AKR beams aligned with subcones as thin as 10◦ and sometimes narrower have been detected.