Quasi-periodic modulations of the Saturnian Kilometric Radiation and their relation to varying solar wind parameters

Details Quasi-periodic modulations of the Saturnian Kilometric Radiation and their relation to varying solar wind parameters Quasi-periodic modulations of the Saturnian Kilometric Radiation and their relation to varying solar wind parameters

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..665p&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Physics

Scientific paper

We consider possible connection between modulations of the SKR radio emission recorded by Cassini RPWS instrument and varying solar wind parameters measured by different spacecraft. "Sliding window" Fourier analysis and nonlinear Wigner- Ville transform have been applied. The data sets from Cassini-RPWS (SKR radio emission measurements), Cassini-CAPS (solar wind plasma measurements), Cassini- MAG (magnetic field), Ulysses-SWOOP (solar wind plasma measurements), Ulysses- VHM/FGM (Vector Helium Magnetometer/Flux Gate Magnetometer), and Wind SWE (Solar Wind Experiment) experiments were used. The analyzed SKR time profile has been produced by integration of the Stokes parameters spectra of the SKR over frequency range from 20 to 1000 kHz. Profiles of the solar wind parameters measured by Wind and Ulysses were projected onto Cassini orbit by means of an MHD simulation of the solar wind evolution between 1 and 9.5 AU. Performed study confirms strong correlation between solar wind plasma parameters and SKR and shows evident existences of 7-8, 9-10, 12-13 and 25-27 days modulation lines in the spectra of the SKR and solar wind profiles. These modulations are very likely to be manifestation of the typical periodicities in the solar surface magnetic activity.

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