Multipoint Spacecraft Observations of Long-lasting Pc4 Pulsations in the Dayside Magnetosphere: The particles Signatures
Abstract
We use magnetic field and plasma observations from the Van Allen Probes spacecraft to study the spatial and temporal characteristics of long-lasting Pc4 pulsations during six orbits in the dayside magnetosphere. We investigated the nodal structure of the waves. When they exhibite a strong compressional component, the spacecraft observe meridional sloshing of the node. When the node's motion attains maximum amplitude, spacecraft off the equator observe one peak while spacecraft at the equator observe two compressions per cycle. The particles observed by Van Allen Probes, THEMIS A and GOES 13 and 15 over a broad range of energies from tens of eV to 2 MeV exhibit regular periodicity with periods corresponding to the ULF magnetic field waves. We attribute the Pc4 pulsations to a drift bounce resonance mechanism.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E1815K