Composition of Auroral Polar Cap Boundary Ion Conics

Details Composition of Auroral Polar Cap Boundary Ion Conics Composition of Auroral Polar Cap Boundary Ion Conics

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22a0562t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22A-0562

Physics

2419 Ion Chemistry And Composition (0335), 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

Ion conics have frequently been observed by FAST on the auroral polar cap boundary, which we have defined as where the ion energy flux sharply drops off. These polar cap boundary (PCB) ion conics are particularly prevalent in the nightside sector near midnight. Of medium energies (100 eV to 1 keV), these ion conics are characterized by intense number fluxes and often constitute the majority of the outflow from the nightside auroral oval. An earlier study has reported that the PCB ion outflow consisted predominantly of H+ and He+, while a separate study presented data that showed PCB ion conics that consisted primarily of oxygen ions. Possible explanations for the composition change include solar cycle variation or seasonal variation. We will explore through a systematic consideration of FAST orbits from 1997 through 2000 the change in composition of PCB ion conics. Since neither the solar cycle nor the seasons alone seem to explain the variation in ion composition of the PCB ion conics, we will consider alternative possibilities such as convection, IMF dependence, or auroral activity level and history.

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