Comparison Between Ion Bulk Flows and E x B Drifts in the Topside Ionosphere.

Details Comparison Between Ion Bulk Flows and E x B Drifts in the Topside Ionosphere. Comparison Between Ion Bulk Flows and E x B Drifts in the Topside Ionosphere.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0832b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0832

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2463 Plasma Convection, 2481 Topside Ionosphere, 2494 Instruments And Techniques

Scientific paper

Ion bulk-flow observations are presented using data gathered by probes on the GEODESIC sounding rocket. GEODESIC flew through a series of auroral arcs in the topside ionosphere during an auroral breakup on February 26, 2000. It reached an apogee of 991 km over Kaktovic, Alaska. The rocket carried an ion energy-spectrograph (E < 20 eV) capable of taking 10 ms snapshots of differential energy-flux distributions with high resolution in energy and pitch-angle. From these distributions we calculate the component of ion bulk flow perpendicular to the local geomagnetic field direction. These results are compared with the E x B drift velocity inferred from the DC electric and magnetic field instruments on-board the rocket. In addition to the perpendicular component of the bulk flow velocity, the spectrograph measures flow parallel to the local geomagnetic field, providing a three-dimensional picture of the large-scale flows during the breakup event. In addition to the large scale convection flows, the ion bulk flow data also address properties of smaller structures in the upper auroral ionosphere. In particular, over one-hundred lower-hybrid solitary structures (LHSS) were observed by the wave electric field probes on GEODESIC. The short-scale three-dimensional bulk flow properties of these LHSSs are presented and theoretical implications are discussed.

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