Goniopolarimetry: Space-borne radio astronomy with imaging capabilities |
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Affiliation: | LESIA, CNRS – Observatoire de Paris – UPMC – Université Denis-Diderot, 5, place Jules-Janssen, 92195 Meudon cedex, France |
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Abstract: | The principles of space-based low-frequency radio astronomy (below 50 MHz) are briefly introduced. As the wavelength range considered does not allow the use of focusing systems, goniopolarimetric (or direction-finding) techniques have been developed. These inversion techniques provide the direction of the wave vector, the polarization state and the flux of the observed electromagnetic wave. In case of spatially extended sources, we can also infer an order of magnitude of the apparent source size. These techniques are presented, and their limitations are discussed. An example from a recent study illustrates the techniques and capabilities. |
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Keywords: | Radioastronomy Space Physics Goniopolarimetry Auroral Physics Radioastronomie Physique spatiale Goniopolarimétrie Physique Aurorale |
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