Motion of Poleward Moving Auroral Forms During a Shift of the Interplanetary Magnetic Field Bz-Component, From a Southward to Northward Orientation

Details Motion of Poleward Moving Auroral Forms During a Shift of the Interplanetary Magnetic Field Bz-Component, From a Southward to Northward Orientation Motion of Poleward Moving Auroral Forms During a Shift of the Interplanetary Magnetic Field Bz-Component, From a Southward to Northward Orientation

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a2013f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41A-2013

Astronomy and Astrophysics

Astrophysics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2723] Magnetospheric Physics / Magnetic Reconnection, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection

Scientific paper

Poleward moving auroral forms (PMAFs) have been identified in past studies as Ionospheric signatures of magnetic reconnection on the dayside. Magnetic reconnection occurs on the dayside when the interplanetary magnetic field (IMF) Bz component is southward. During these periods of magnetic reconnection the auroral oval shifts equatorward and PMAFs begin to move poleward. Not all PMAFs have the same brightening history. PMAF1 events fade with time and PMAF2 events rebrighten as they move poleward. A third class of PMAFs (PMAF3 events) has been found to stall as the drift poleward. PMAF3 events occur during times when the auroral oval is expanded and begins to contract poleward. This poleward shift of the auroral oval occurs when the IMF Bz component turns from a southward to northward orientation. This study looks at 20 years of meridian scanning photometer (MSP) and all-sky camera (ASC) data from the Kjell Henriksen Observatory in Longyearbyen, Norway. The documentation of PAMF3 events has been obtained from this data set and combined with IMF data. The PMAF3 events appear to be linked to periods when the IMF Bz-component shifts from southward to northward. Their connection to a theoretical model of magnetic reconnection will also be presented.

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