Long periodic variations of AKR and SKR

Recent spacecraft studies on the "solar - planetary" relations are directly connected with a detailed understanding of the complex mechanisms of the energy transfer from the solar wind into planetary magnetospheres. In this respect an investigation of the planetary radio emissions as an indicator of magnetospheric activity is of high importance and may provide a unique tool for remote sensing of the internal structure and dynamics of the planetary magnetospheres. The proposed research program comprises the investigation of the long quasi-periodic fluctuations of terrestrial Auroral Kilometric Radiation (AKR) and Saturnian Kilometric Radiation (SKR) caused by periodic variations of the solar and planetary rotation, by magnetospheric field line resonances and getting influenced by planetary moons. Studies of these variations represent a new and promising approach in the field of planetary magnetospheric radio physics. This research will contribute to the development of a generalized common view on the interaction of radio planets with solar wind environments as well as leading to a better understanding of planetary rotational control of SKR and AKR, and of the interrelation between SKR and Saturnian satellites. The proposed project consists of two parts: (1) investigation of the relations between the quasi-periodic variations of the planetary radio emission and the parameters of the solar activity; (2) study of the AKR pulsations and the quasi-periodic variations of the SKR driven by internal dynamic processes within the respective magnetospheres. The periodic fluctuations of the observed parameters will be studied by means of Wigner - Ville transform and sliding window Fast Fourier Transform, methods of high accuracy and developed by the project team. Within the frame of the proposed project, the analysis and interpretation of the observed data will be combined with theoretical studies. The kinetic theory of the standing shear Alfvén waves in planetary magnetospheres, e. g., will be applied for a self-consistent description of the mechanism by which the field line resonances may generate (or modulate) the pulsating AKR or, eventually, SKR events.

Recent spacecraft studies on the "solar - planetary" relations are directly connected with a detailed understanding of the complex mechanisms of the energy transfer from the solar wind into planetary magnetospheres. In this respect an investigation of the planetary radio emissions as an indicator of magnetospheric activity is of high importance and may provide a unique tool for remote sensing of the internal structure and dynamics of the planetary magnetospheres. The proposed research program comprises the investigation of the long quasi-periodic fluctuations of terrestrial Auroral Kilometric Radiation (AKR) and Saturnian Kilometric Radiation (SKR) caused by periodic variations of the solar and planetary rotation, by magnetospheric field line resonances and getting influenced by planetary moons. Studies of these variations represent a new and promising approach in the field of planetary magnetospheric radio physics. This research will contribute to the development of a generalized common view on the interaction of radio planets with solar wind environments as well as leading to a better understanding of planetary rotational control of SKR and AKR, and of the interrelation between SKR and Saturnian satellites. The proposed project consists of two parts: (1) investigation of the relations between the quasi-periodic variations of the planetary radio emission and the parameters of the solar activity; (2) study of the AKR pulsations and the quasi-periodic variations of the SKR driven by internal dynamic processes within the respective magnetospheres. The periodic fluctuations of the observed parameters will be studied by means of Wigner - Ville transform and sliding window Fast Fourier Transform, methods of high accuracy and developed by the project team. Within the frame of the proposed project, the analysis and interpretation of the observed data will be combined with theoretical studies. The kinetic theory of the standing shear Alfvén waves in planetary magnetospheres, e. g., will be applied for a self-consistent description of the mechanism by which the field line resonances may generate (or modulate) the pulsating AKR or, eventually, SKR events.