Multi-Spacecraft Comparisons of Intense Activity at Low Auroral Latitudes During Major Geomagnetic Storms

Details Multi-Spacecraft Comparisons of Intense Activity at Low Auroral Latitudes During Major Geomagnetic Storms Multi-Spacecraft Comparisons of Intense Activity at Low Auroral Latitudes During Major Geomagnetic Storms

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13a1184d&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13A-1184

Physics

2716 Energetic Particles, Precipitating, 2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

Major geomagnetic storms (DST < ˜ -200 nT) while quite rare (only ˜18 have occurred within the past 5 years) produce dramatic activity within most regions of the earth's magnetosphere, providing an opportunity to study the coupling of these different regions under extreme conditions. Possibly the most prominent type of activity common to such storms is a variety of aurora at low auroral zone latitudes, well equatorward of the standard Region I/II current systems. We present results of a study of such events where intense downgoing electron fluxes are observed in the FAST spacecraft data at altitudes of 3000-4000 km. We compare the particle distributions, and electric and magnetic wave characteristics at FAST during these events with concurrent data from spacecraft which are located at similar latitudes and local times to FAST but in more distant regions of the magnetosphere, at 5-10 RE, including the Cluster, Polar, and several geosynchronous satellites. We also compare the in situ data with spacecraft auroral images. In particular, we investigate how observed low latitude aurora and their associated downward electron flux at FAST altitudes are coupled to conditions at 5-10 RE during major geomagnetic storms.

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