Goniopolarimetry: Space-borne radio astronomy with imaging capabilities

Baptiste Cecconi

doi:10.1016/j.crhy.2014.02.005

Goniopolarimetry: Space-borne radio astronomy with imaging capabilities
[Goniopolarimétrie : Imagerie en radioastronomie spatiale]

Baptiste Cecconi ¹

¹ LESIA, CNRS – Observatoire de Paris – UPMC – Université Denis-Diderot, 5, place Jules-Janssen, 92195 Meudon cedex, France

Comptes Rendus. Physique, Volume 15 (2014) no. 5, pp. 441-447.

Résumé
Abstract

La radioastronomie basse fréquence (en dessous de 50 MHz) couvre principalement l'étude des émissions radio planétaires et solaires. Comme la gamme de longueur d'onde considérée ne permet pas l'utilisation de systèmes focalisants, les techniques d'inversion goniopolarimétrique ont été développées. Ces inversions fournissent la direction du vecteur d'onde, l'état de polarisation et la densité spectrale de puissance d'une onde électromagnétique observée. Dans le cas de sources radio spatialement étendues, on peut aussi obtenir l'ordre de grandeur de la taille apparente de la source. Ces techniques sont présentées, ainsi que leurs limitations. Un exemple tiré d'une étude récente illustre ces techniques.

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.

Publié le : 2014-04-13

DOI : 10.1016/j.crhy.2014.02.005

Keywords: Radioastronomy, Space Physics, Goniopolarimetry, Auroral Physics
Mot clés : Radioastronomie, Physique spatiale, Goniopolarimétrie, Physique Aurorale

Affiliations des auteurs :

Baptiste Cecconi ¹

¹ LESIA, CNRS – Observatoire de Paris – UPMC – Université Denis-Diderot, 5, place Jules-Janssen, 92195 Meudon cedex, France

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     title = {Goniopolarimetry: {Space-borne} radio astronomy with imaging capabilities},
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     pages = {441--447},
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     number = {5},
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     doi = {10.1016/j.crhy.2014.02.005},
     language = {en},
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Baptiste Cecconi. Goniopolarimetry: Space-borne radio astronomy with imaging capabilities. Comptes Rendus. Physique, Volume 15 (2014) no. 5, pp. 441-447. doi : 10.1016/j.crhy.2014.02.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2014.02.005/

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