Phase relations between energetic neutral atom intensitiesand kilometric radio emissions at Saturn

摘要

[1] The intensities of energetic neutral atoms (ENAs) from Saturn's ring current werecross-correlated with Saturn kilometric radiation (SKR, 100-400 kHz) to determine theirphase relations. The cross correlations were obtained for three intervals in early 2007when Cassini was at high northern latitudes and the Ion and Neutral Camera (INCA) couldoptimally view the entire ring current. During these intervals, the hydrogen, oxygen, andSKR signals all exhibited 10.8 h periodicities. A consistent phase relation was notobserved between the ENA and the SKR. Cross-correlation amplitudes in these intervalsvaried from 0.25 to 0.79, and the phase offsets varied from 4 h to several hours anddiffered according to ENA species. Not only did the SKR and ENA signal show phaseoffsets, but the H and 0 signals also displayed offsets. That is, all periodicities at -10.8 hhad no consistent synchronization.