[PEM14-P30] Ground-based and magnetospheric observation of auroral finger-like structures using the RBSP-A satellite in the inner magnetosphere
Keywords:auroral finger-like structure, RBSP, inner magnetosphere
The best event which we found is that observed at Gillam, Canada, at ~0900 UT on 14 Nov. 2014. In this event, the footprints of the RBSP-A satellite passed across the auroral finger-like structures several times according to the field-line mapping using the Tsyganenko-01 magnetic field model. We obtained observational facts from this simultaneous observation event as: 1) both electron and ion OMNI fluxes measured by HOPE increase at ~0900 UT as the satellite footprint was getting into the auroral region; 2) electron cyclotron harmonics (Ech) wave activities at ~1 kHz measured by EMFSIS enhanced after 0900 UT; 3) electric field in GSM-Y direction measured by EFW decreases during northward development of the finger-like structures; 4) absolute value of magnetic pressure is almost ten times larger than that of ion thermal pressure; 5) variation of magnetic pressure and ion thermal pressure are seen in various time scales, including ~5 min which is the time scale of crossing of finger-like structures. In the presentation, we will discuss these observations in the context of magnetospheric instabilities that can cause auroral finger-like structures.