Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31a2094s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31A-2094
Physics
[2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2799] Magnetospheric Physics / General Or Miscellaneous, [7954] Space Weather / Magnetic Storms, [7959] Space Weather / Models
Scientific paper
Storm-scale structure and dynamics of the geomagnetic field and underlying electric currents for magnetic storms containing sawtooth events is investigated using the empirical model TS07D. The analysis of subsets of the nearest neighbors for these storms, including events with similar values of the solar wind inductive electric field parameter, Sym-H index and its time derivative, suggests that sawtooth substorms belong to a separate class of storms with distinctive storm-scale features. It is found that one of such features is the formation of the equatorial storm-time current with the unusually broad radial extension, far beyond geosynchronous orbit at all local times. It explains the broad distribution of sawtooth injections in the local time and the reduction of the equatorial magnetic field on the dayside observed for sawtooth storms. It also helps explain recent results of the first-principle modeling, where the use of geosynchronous orbit as an external boundary condition in a ring current model results in a strong underestimation of the total magnetic field disturbance, and in particular the Dst index reduction.
Merkin V. G.
Ohtani Shin
Sitnov Mikhail I.
Stephens G. K.
Ukhorskiy Aleksandr Y.
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