Результаты исследований: Публикации в книгах, отчётах, сборниках, трудах конференций › глава/раздел › Рецензирование
Spatial structure and asymmetries of magnetospheric currents inferred from high-resolution empirical geomagnetic field models. / Sitnov, M. I. ; Stephens, G. K. ; Tsyganenko, N. A. ; Ukhorskiy, A. Y. ; Wing, S.; Korth, H.; Anderson, B. J. .
Dawn-Dusk Asymmetries in Planetary Plasma Environments: Geophysical Monograph Ser. 230. ред. / Stein Haaland; Andrei Runov; Colin Forsyth. Том 230 США : American Geophysical Union, 2017. стр. 199-212.Результаты исследований: Публикации в книгах, отчётах, сборниках, трудах конференций › глава/раздел › Рецензирование
}
TY - CHAP
T1 - Spatial structure and asymmetries of magnetospheric currents inferred from high-resolution empirical geomagnetic field models
AU - Sitnov, M. I.
AU - Stephens, G. K.
AU - Tsyganenko, N. A.
AU - Ukhorskiy, A. Y.
AU - Wing, S.
AU - Korth, H.
AU - Anderson, B. J.
PY - 2017
Y1 - 2017
N2 - A recent dramatic increase in the amount of data enabled a new approach to empirical modeling of magnetospheric currents. In this approach, the custom‐tailored modules prescribing the configuration of currents are replaced by basis function expansions. Here we show that the extension of this approach to field‐aligned currents allows one to reproduce the spiral structure of the low‐altitude field‐aligned currents corresponding to the Harang reversal on the nightside. The new empirical geomagnetic field model is applied to the 14 November 2012 magnetic storm. The current structure and evolution is studied in the equatorial plane, at low altitude and in 3D. This study shows that the main factor of the storm‐time asymmetry of the magnetosphere, in addition to natural stretching of its magnetic field lines from day to night under the direct interaction with the solar wind, is the partial ring current located in the evening sector. It also reveals a new interesting effect of the bifurcation of currents flowing away from ionosphere in the evening sector, which form a continuous pattern at low altitudes corresponding to the Harang reversal, but farther in the magnetosphere split and join either the ring current or magnetopause currents.
AB - A recent dramatic increase in the amount of data enabled a new approach to empirical modeling of magnetospheric currents. In this approach, the custom‐tailored modules prescribing the configuration of currents are replaced by basis function expansions. Here we show that the extension of this approach to field‐aligned currents allows one to reproduce the spiral structure of the low‐altitude field‐aligned currents corresponding to the Harang reversal on the nightside. The new empirical geomagnetic field model is applied to the 14 November 2012 magnetic storm. The current structure and evolution is studied in the equatorial plane, at low altitude and in 3D. This study shows that the main factor of the storm‐time asymmetry of the magnetosphere, in addition to natural stretching of its magnetic field lines from day to night under the direct interaction with the solar wind, is the partial ring current located in the evening sector. It also reveals a new interesting effect of the bifurcation of currents flowing away from ionosphere in the evening sector, which form a continuous pattern at low altitudes corresponding to the Harang reversal, but farther in the magnetosphere split and join either the ring current or magnetopause currents.
M3 - Chapter
SN - 9781119216322
VL - 230
SP - 199
EP - 212
BT - Dawn-Dusk Asymmetries in Planetary Plasma Environments
A2 - Haaland, Stein
A2 - Runov, Andrei
A2 - Forsyth, Colin
PB - American Geophysical Union
CY - США
ER -
ID: 9176647