The Auroral and Ground-Magnetic Response to Different Magnetotail Drivers

Details The Auroral and Ground-Magnetic Response to Different Magnetotail Drivers The Auroral and Ground-Magnetic Response to Different Magnetotail Drivers

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm53a..06r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM53A-06

Physics

[2409] Ionosphere / Current Systems, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2744] Magnetospheric Physics / Magnetotail, [2790] Magnetospheric Physics / Substorms

Scientific paper

Of critical importance to resolving the substorm problem is our understanding of the response of the ionosphere to a variety of magnetotail drivers. We present a series of case studies of the ionospheric response to substorm expansion phase onset and other auroral activations using both in-situ data from Cluster and THEMIS spacecraft and data from the combined networks of magnetometers in the North American sector, including those from CARISMA (www.carisma.ca), THEMIS ground-based observatory magnetic and optical network, and data from supporting arrays. We present details of magnetic disturbance diagnostics which may distinguish between tail drivers, including using ULF waves via the Automated Wavelet Estimation of Substorm Onset and Magnetic Events (AWEWSOME) technique and the creation of local auroral and polar electrojet indices. We then use an independently-derived list of nightside auroral activations in order to probe whether the location of the dominant electrojet signature and ULF wave activity can be used to determine the difference between magnetotail drivers. These analyses serve to highlight the importance of extensive magnetometer coverage in order to correctly identify and characterise the initiation and temporal variations of ionospheric electrodynamics during nightside auroral activations. We seek ground signatures that can distinguish between current systems due to various magnetotail drivers.

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