A Statistical Study of Polar Wind Pitch Angle Distributions

Details A Statistical Study of Polar Wind Pitch Angle Distributions A Statistical Study of Polar Wind Pitch Angle Distributions

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0825h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0825

Physics

Plasma Physics

7800 Space Plasma Physics, 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes, 7894 Instruments And Techniques

Scientific paper

The polar wind has been established in recent years as a significant potential source of magnetospheric plasma. In general, however, polar wind ions exiting the ionosphere may have a variety of destinations. Whether any particular ion travels out to the plasma sheet, escapes through the magnetosheath, or falls back into the ionosphere is determined in part by its initial pitch angle and energy as it leaves the ionosphere. While there have been several statistical surveys of polar wind bulk parameters, little is known about the detailed pitch angle distributions of these ions. We present the results from a statistical survey of polar wind pitch angle distributions along with the corresponding ion energies, fluxes, and locations observed by the TIDE instrument on the ISTP/POLAR spacecraft. We also demonstrate how the ultimate destination of modeled outflowing polar wind ions may depend strongly on the initial pitch angles used in the model. This study will serve as a significant step toward completing our understanding of plasma transport between the earth's ionosphere and magnetosphere.

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