Polar spacecraft data was used to take inventory of the different wave and particle energy
forms present in the dayside intermediate-altitude cusp region during periods of intense
seen in the major geomagnetic storms in October and November 2003.
From this inventory, the energy budget of this region during northward and southward
IMF was inferred. Dominant forms of energy in this region include Poynting flux
frequency bands, large upgoing ion fluxes
, and energetic particle fluxes
to the magnetic field. Hydra particle data from Polar showed out
owing ions with
high energies simultaneous to intense Poynting flux.
Filtering the Poynting flux
three time scales revealed that only the energy from the low-frequency Poynting flux
is consistently sufficient to account for the ion kinetic energy flux
seen during these
intervals. The presence of field-aligned current structures in the magnetic field data
suggests that the low-frequency Poynting flux
associated with these structures may be
powering the energization of upgoing ions. The electric and magnetic field data were
used to detect Alfven waves, and Alfvenic Poynting flux
is consistently another of the
important forms of energy present. Moderate fluxes
of ions energized perpendicular to
the magnetic field (as seen in the Hydra data) may be indicative of ion cyclotron or
kinetic Alfven waves heating the ions perpendicular to the field.
University of Minnesota M.S. thesis. June 2011. Major: Physics. Advisor: John R. Wygant. 1 computer file (PDF); vii, 50 pages, appendix A.
Observation of intense poynting flux in the dayside cusp region during ion outfows.
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