Ion Accelerating by Turbulent Electric Fields in High-Altitude Cusp

Details Ion Accelerating by Turbulent Electric Fields in High-Altitude Cusp Ion Accelerating by Turbulent Electric Fields in High-Altitude Cusp

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51c0382c&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51C-0382

Physics

2712 Electric Fields (2411), 2720 Energetic Particles, Trapped, 2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics

Scientific paper

The high-altitude dayside cusp is an extremely dynamic region in geospace. The cusp energetic particles (CEP) have been observed there, showing orders of magnitude increase of ion intensities with energies from 20 keV up to 10 MeV. Associated with these charged particles are large diamagnetic cavities and strong electromagnetic turbulence. Turbulent cusp electrical field with an amplitude up to 120 mV/m has been detected. Dominated by its perpendicular components, the cusp electric field spectral density for fluctuations in the ultra-low frequency (ULF) range shows orders of magnitude increase. Both left- and right-hand polarizations have been measured. The ULF range covers the cusp ion gyrofrequencies. The cusp ions can be energized by both resonant and stochastic acceleration mechanisms.

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