Response of Aurorae, Plasma Convection, and Birkeland Currents to Strong IMF By and Negative Bz Conditions

Details Response of Aurorae, Plasma Convection, and Birkeland Currents to Strong IMF By and Negative Bz Conditions Response of Aurorae, Plasma Convection, and Birkeland Currents to Strong IMF By and Negative Bz Conditions

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..02s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43B-02

Physics

7835 Magnetic Reconnection (2723, 7526), 2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere

Scientific paper

In a number of case event studies we probe the association between dayside auroral forms/activities and plasma convection channels (pulsed ionospheric flows) located at the dayside polar cap boundary during By-dominated IMF conditions when a negative Bz-component is also present (clock angle range 90-135°). Both polarities of IMF By are included. We base our results on (i) ground auroral observations at high latitudes (70-80° MLAT) and (ii) particle precipitation, ion drift, and Birkeland current measurements made by the DMSP F13 spacecraft. The following auroral types in the system of forms and activities within the merging and lobe convection cells are noted: (i) cusp 1 aurora ("midday gap"), (ii) cusp 2 aurora in the postnoon sector (By > 0 ), (iii) dayside BPS/LLBL aurorae in the pre- and postnoon sectors, (iv) poleward moving auroral forms (PMAFs) in the mantle regime, and (v) polar arcs on the pre- and postnoon sides of the polar cap. We investigate how these auroral forms evolve in space and time during magnetopause reconnection events. Our goal is to obtain a comprehensive picture of the complex system of dayside and polar cap auroral forms and convection channels contributing to the large-scale pattern of plasma convection/precipitation with the dawn-dusk asymmetry imposed by the IMF By-component. Emphasis is placed on small- and medium-scale structures. These are often averaged out in large statistical studies.
This work is supported in part by NASA Grants NNG05GG25G and NNG05GC75G

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