5:15 PM - 6:30 PM
[PEM08-P12] Periodic Ion Flux Modulation observed by Van Allen Probes in Ring Current Region
Keywords:wave-particle interaction, drift-bounce resonance, geomagnetic pulsations, oxygen ions, ring current, Van Allen Probes
In this study, we report several events of periodic flux modulation of protons and O+ ions observed by Van Allen Probes in 2012-2016. We find periodic flux modulation of O+ ions and Pc5 waves on November 4, 2015 (event A) and November 30, 2015 (event B). In event A, the flux modulation is recognized at 1-50 keV and dispersed in energy. In event B, however, the flux modulation is limited at ~10 keV. We will examine dependence of the flux variations on pitch angles and energies, and discuss if the variations are due to drift-bounce resonance.