Ionospheric Flow Shear Associated with Poleward Boundary Intensification (PBI)

Details Ionospheric Flow Shear Associated with Poleward Boundary Intensification (PBI) Ionospheric Flow Shear Associated with Poleward Boundary Intensification (PBI)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1832s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1832

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2744] Magnetospheric Physics / Magnetotail

Scientific paper

In this study, we investigate the relation of PBIs to the variation of ionospheric convection flows by overlaying flow observations from the SuperDARN radar and concurrent auroral images from the IMAGE satellite. We find that the aurora of most PBIs has a clear ionospheric flow shear around the auroral form and occurring simultatneously with the PBI onset. The flow shear is in the south/east to north/west direction, along the direction of the auroral form, with the south/east flow occurring at the poleward side of the PBI and the south/west flow at the bottom side of the PBI. The PBI auroral arcs are found to be near the center of the shear. The magnitude of the flow generally enhances on either side or on both sides of PBI. Corresponding DMSP observations indicate the existence upward field-aligned current (FAC) in the region of the aurora arc and downward FACs poleward of as well as equatorward of the auroral arc. This is consistent with the FAC current structure associated with the plasma sheet bubble model. It also fits the spatial distribution of large-scale region 1 and region 2 FAC in the premidnight sector. We also find that the PBI aurora occurs near the open-closed field line boundary but on closed field lines, although flow enhancement does appear on open field lines. In situ observations from Geotail for fortuitous conjunctions confirm the association of PBIs and the simultaneous ionospheric flow shear with midtail fast flows.

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