| The physics of the creation, loss, and transport of radiation belt
particles is intimately connected to the electric and magnetic fields which
mediate these processes. A large range of field and particle interactions
are involved in this physics from large-scale ring current ion and magnetic field
dynamics to microscopic kinetic interactions of whistler-mode chorus waves with
energetic electrons. To measure these kinds of radiation belt interactions,
NASA implemented the two-satellite Van Allen Probes mission. As part of the
mission, the Electric and Magnetic Field Instrument Suite and Integrated
Science (EMFISIS) investigation is an integrated set of instruments consisting of a tri-axial fluxgate
magnetometer (MAG) and a Waves instrument which includes a tri-axial search
coil magnetometer (MSC). These wave measurements include AC electric and magnetic
fields from 10Hz to 400 kHz. We show examples of plasmapause identification and
variation determined by the upper hybrid resonance, low frequency ULF pulsations,
and whistler mode waves including upper and lower band chorus. These data are compared
with particle measuements to show relationships between wave activity and particle
energization. |