Tail and Ionospheric Signatures of Tail Fast Flows Associated with PBIs and with Substorms

Details Tail and Ionospheric Signatures of Tail Fast Flows Associated with PBIs and with Substorms Tail and Ionospheric Signatures of Tail Fast Flows Associated with PBIs and with Substorms

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm23b..03s&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM23B-03

Physics

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

Earthward convection of the tail plasma sheet is often organized in bursts of fast ion flows restricted in azimuthally narrow channels. It has been shown that Auroral Poleward Boundary Intensifications (PBIs) are often the ionospheric signature of such fast flow channels in the midtail. Equatorward flow bursts have been observed in the ionosphere, and have been shown to be the ionospheric mapping of the tail fast flow channels in few case studies. We focus on identifying such ionospheric signatures and understanding the physics of this magnetosphere-ionosphere interaction via conjunctions of the THEMIS probes with the Sondrestrom radar. 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, only occasionally being seen also in the midtail. Clear dipolarizations are seen with such flows in the inner magnetosphere but not in the midtail. The ionospheric flow associated with such tail fast flows is far 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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