Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2129g&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2129
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet, [2790] Magnetospheric Physics / Substorms
Scientific paper
The isotropy boundary, i.e. the lower limit of significant proton precipitation into the ionosphere, moves equatorward as the geosynchronous magnetic field elevation angle decreases. At the beginning of the substorm expansion phase, the magnetic field is highly stretched (low elevation angle) except in a very azimuthally localized region (the substorm current wedge). As reconnected flux continues to pile up, the substorm current wedge grows both azimuthally and radially. Using a combination of 264 high quality events imaged by the spectrographic imager onboard the IMAGE spacecraft and global MHD simulations, we show that the proton aurora often has a significant decrease in intensity (split) at local times that map into the substorm current wedge. The splitting is much more likely to happen for substorms with lower AL. We show that other parameters such as the width and expansion speed of the split region also correlate with the AL index.
Donovan Eric
Ge Yong-Shuai
Gilson M. L.
Mende Stephen B.
Raeder Joachim
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