Dispersive Ion Injection Signatures Observed at FAST Altitudes during Times of Northward IMF: Characteristics and Origins

Details Dispersive Ion Injection Signatures Observed at FAST Altitudes during Times of Northward IMF: Characteristics and Origins Dispersive Ion Injection Signatures Observed at FAST Altitudes during Times of Northward IMF: Characteristics and Origins

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51b1643b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51B-1643

Physics

2706 Cusp, 2724 Magnetopause And Boundary Layers, 2764 Plasma Sheet

Scientific paper

Overlapping, dispersive ion signatures seen by low-altitude spacecraft traversing Earth's auroral regions during extended period s of northward IMF can be explained by differing injection source and time of flight considerations, but observations suggest that the dispersion is most often spatially determined, and results from velocity filtering following quasi-steady cusp injection. We present first results from a comprehensive study of dispersive ions seen by FAST, providing statistical occurrence information about associated plasma characteristics. The positive, monotonic relationship between energy and latitude for individual dispersive bursts points to a high- latitude source. Loss cone information from pitch-angle distributions indicates whether these ions have mirrored zero, one or multiple times, and this helps establish that injections are occurring simultaneously in both hemispheres. Successive FAST orbits transect the auroral region at different local times and latitudes as Earth rotates underneath, which allows us to map these newly trapped ions throughout a broad range of the oval. We place these survey results into context with near-Earth cold dense plasma sheet observations and argue that dual-lobe reconnection is a likely source.

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