Correlation Between Pi1B pulsations and Poleward Boundary Intensifications

Details Correlation Between Pi1B pulsations and Poleward Boundary Intensifications Correlation Between Pi1B pulsations and Poleward Boundary Intensifications

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33a1883l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33A-1883

Physics

[2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

Polar Boundary Intensification 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, the persistence of electron fluxes during a PBI is remarkably different, lasting 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 Alfvenic aurora at onset. At the same time, Poleward Boundary Intensifications (PBI) have also been related to fast flows, where the equatorward motion is thought to track the propagation Earthward of the flows, and Alfvenic aurora has also been related to PBIs. The similarities between substorm onset and PBIs beg the question of whether Pi1B pulsations are also associated with PBIs. In this study, we show that this is, in fact, the case. Data are presented from three events, with all three events showing clear Pi1B pulsations that are well-correlated with the PBIs.

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