Stuttgart 2012 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 15: Planeten und kleine Körper II
EP 15.4: Vortrag
Donnerstag, 15. März 2012, 11:45–12:00, V55.02
On the arc shapes of the SKR saturnian emission — Mohammed Boudjada1, Patrick Galopeau2, and •Helmut Rucker1 — 1Space Research Institute, Austrian Academy of Sciences, Graz, Austria — 2Université Versailles St-Quentin; CNRS/INSU, LATMOS-IPSL, Guyancourt, France
The Cassini Radio and Plasma Wave Science Experiment (RPWS) revealed prominent arcs when the data are displayed in time-frequency coordinates, in the so-called dynamic spectra. We show that the Saturnian Kilometric Radiation (SKR) presents different kinds of characteristic appearances like arc structures. Those arcs may be classified in two sets: the vertex early arcs (VEA) and the vertex late arcs (VLA). The arcs of the first group set open toward increasing time, while the arcs of the other one open towards decreasing time. Those arcs are observed in the frequency range between 80 kHz and 1 MHz. We investigate the possible dependence on the Cassini observational parameters like the distance to the planet, the local time and the spacecraft latitude. Similar VEA and VLA arc structures have been reported in the case of the Jovian hectometric (HOM) and decametric (DAM) radio emissions. In this contribution, we emphasize on the common and unusual arc features by comparing the auroral emissions related to Jupiter and Saturn.