Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51b0517d&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM51B-0517
Physics
2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2776 Polar Cap Phenomena, 2794 Instruments And Techniques
Scientific paper
Dual Lyman-Birge-Hopfield (LBH) band images from the POLAR satellite UVI instrument are used herein to investigate global conductance morphology for BZ north conditions. An automated data miner was used to nominate candidate LBH images and to correct individual images for UV dayglow. High apogee LBH band images from three successive winter epochs (1997 - 1999) were selected for periods when BZ was greater than 2 nT for at least 30 minutes. This BZ selection criteria was chosen to avoid the variability associated with substorm onset/recovery and to allow the polar ionosphere a significant response time to quiescent magnetospheric forcing. Approximately 2000 image pairs survived selection and were used to estimate global maps for Hall and Pedersen conductance (mean and variance) as a function of By polarity. Two methods were used to create mean and variance conductance maps. In the first method, LBH brightness maps in Rayleighs, assembled for the entire BZ north image ensemble, were used with a neutral atmosphere model to calculate conductance. These brightness maps indicate a BY-dependent variance structure in agreement with modeled and observed morphology of polar cap arcs. The second method calculates conductance on an individual image-by-image basis and forms means and variances on an ensemble of conductance maps. A comparison of both methods will be used to assess the most appropriate for use with highly dynamic and structured storm/substorm images.
Doe Richard A.
Germany G. G.
Lummerzheim Dirk
Semeter Joshua L.
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