Auroral poleward boundary intensifications, their associated tail dynamics and ionospheric flows (Invited)

Details Auroral poleward boundary intensifications, their associated tail dynamics and ionospheric flows (Invited) Auroral poleward boundary intensifications, their associated tail dynamics and ionospheric flows (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53d..01z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53D-01

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet

Scientific paper

Auroral Poleward Boundary Intensifications (PBIs) are often the auroral signature of fast flow channels in the midtail. The auroral signature of the fast flows can be evidenced as either a mostly north-south oriented streamer or as east-west arcs, depending on the how the tail signatures map to the ionosphere. Our recent work has focused in identifying the ionospheric flow signature associated with PBIs and tail fast flows and the relationship of PBIs and associated flows with substorms. We study conjunctions of the THEMIS probes with the Sondrestrom radar to identify such relationships. We find fundamental differences between the tail fast flows that are associated with substorm onsets and those associated with PBIs, as well as between their respective ionospheric flow signatures. The tail fast flows that produce PBIs are observed in the midtail. They do not typically penetrate to the inner magnetosphere and they are accompanied by plasma sheet expansion signatures in the mid tail. No dipolarization signatures are observed in the inner magnetosphere. The ionospheric signatures associated with such tail flows are PBI-type aurora and substantially enhanced equatorward flows. Tail fast flows that are associated with substorm onsets are typically observed only by the inner magnetosphere probes, and occasionally being seen in the midtail as well. Clear dipolarizations are seen with such flows in the inner magnetosphere but not in the midtail. The ionospheric flow signature associated with such tail fast flows is distinct: enhanced westward flows being occasionally seen at the higher latitude part of the Sondrestrom field of view with enhanced eastward flows observed at the lower latitudes. Enhanced equatorward flows are not seen.

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