Association of Pi1B Micropulsations and Poleward Boundary Intensifications

Details Association of Pi1B Micropulsations and Poleward Boundary Intensifications Association of Pi1B Micropulsations and Poleward Boundary Intensifications

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51d..03l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51D-03

Physics

[2487] Ionosphere / Wave Propagation, [2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

Poleward boundary intensifications (PBIs) represent a type of aurora where a series of brightenings or intensifications are seen along the poleward edge of the aurora oval. Although this signature is similar to substorm onset in a general sense, electron fluxes during a PBI persist much longer. Pi1B pulsations have been associated with substorm onset for decades, with recent work showing that these pulsations appear to be excited by the arrival of fast flows and perhaps provide the wave power to produce Alfvénic aurora at onset. At the same time, PBIs have also been related to fast flows, where the equatorward motion is thought to track the earthward propagation of the flows, and Alfvénic aurora has also been related to PBIs. The similarities between substorm onset and PBIs raise the question of whether Pi1B pulsations are also associated with PBIs. In this study, we show three events, where this is, in fact, the case, with all three events showing clear Pi1B pulsations that are well-correlated with the PBIs. These observations are consistent with the PBIs and waves being produced by reconnection at a near-Earth neutral line, a scenario which places important constraints on substorm generation models.

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