Survey of Ion Beams Observed Near Substorm Onset by Polar/TIDE in the Nightside Magnetosphere

Details Survey of Ion Beams Observed Near Substorm Onset by Polar/TIDE in the Nightside Magnetosphere Survey of Ion Beams Observed Near Substorm Onset by Polar/TIDE in the Nightside Magnetosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32a1133c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM32A-1133

Physics

2451 Particle Acceleration, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

We investigate characteristics of ionospheric ion beams before, during, and after substorm onsets in the near-Earth ( ˜6-9.6 Re) nightside magnetosphere using Polar spacecraft observations and minute resolution AE and Dst indices. The ionosphere continually supplies low energy ions to the plasma sheet. Ionospheric ion outflow increases strongly with increasing geomagnetic activity and ion transport from the ionosphere is predominantly as beams closely-aligned to the magnetic field. Polar's orbital apogee precession through low latitudes in 2001-2003 permits long-term insitu near-equatorial measurements by the Polar/TIDE ˜0.4-420 eV core plasma ion spectrometer. In a search for spatial and temporal patterns near substorm onset, detailed changes in ion flux anisotropy, average energy, and intensity level will be subject to qualitative and quantitative analysis. Historically, studies have provided average measurements and velocity moment analyses at low ion energies. This study will characterize the range of detailed low energy ionospheric ion flux variations at and around the time of substorm onset.

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