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Found 4 entries in the Bibliography.
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The Dynamics of the Alfvénic Oval
The auroral oval is a well-established concept, introduced more than five decades ago. The Alfvénic oval, on the other hand, is a very recent concept, which has been revealed in both observational and numerical studies. This is the first review of the global Alfvénic oval, while also defining primary, secondary and tertiary layers of the Alfvénic oval. The focus lies on the large-scale dynamic properties of the global Alfvénic oval in relation to the AE index, substorm phases, storm phases and solar wind/IMF conditions. ...
Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: aug
YEAR: 2021   DOI: 10.1016/j.jastp.2021.105616
AURORA; Alfven wave; Energy transport; geomagnetic activity; magnetosphere-ionosphere coupling; Wave-particle interaction
Explicit IMF By-Dependence in Geomagnetic Activity: Quantifying Ionospheric Electrodynamics
Geomagnetic activity is mainly driven by the southward (Bz) component of the interplanetary magnetic field (IMF), which dominates all solar wind coupling functions. Coupling functions also depend on the absolute value of the dawn-dusk (By) component of the IMF, but not on its sign. However, recent studies have shown that for a fixed level of solar wind driving, auroral electrojets in the Northern Hemisphere (NH) are stronger for By \textgreater 0 than for By \textless 0 during NH winter. In NH summer, the dependence on the B ...
Holappa, L.; Robinson, R.; Pulkkinen, A.; Asikainen, T.; Mursula, K.;
Published by: Journal of Geophysical Research: Space Physics Published on:
YEAR: 2021   DOI: 10.1029/2021JA029202
space weather; magnetosphere-ionosphere coupling; field-aligned currents; geomagnetic activity
The Northward IMF Magnetosphere
The manner in which the Earth s magnetosphere responds to the solar wind is highly dependent upon the orientation of the interplanetary magnetic field (IMF), particularly the north–south (B Z ) component. As most auroral and geomagnetic activity occurs when the IMF is southward (or weakly northward, but dominated by the dawn–dusk [B Y ] component), it is perhaps unsurprising that these conditions have received the most attention. However, when the IMF is more strongly northward (B Z \textgreater 0 and B Z \textgreater \t ...
Published by: Published on:
YEAR: 2021   DOI: 10.1002/9781119815624.ch19
auroral response; Earth s magnetosphere; geomagnetic activity; interplanetary magnetic field; magnetospheric dynamics; solar wind-magnetosphere coupling
Simulations of the equatorial thermosphere anomaly: Geomagnetic activity modulation
The modulation of geomagnetic activity on the equatorial thermosphere anomaly (ETA) in thermospheric temperature under the high solar activity condition is investigated using the Thermosphere Ionosphere Electrodynamics General Circulation Model simulations. The model simulations during the geomagnetically disturbed interval, when the north-south component of the interplanetary magnetic field (Bz) oscillates between southward and northward directions, are analyzed and also compared with those under the ...
Lei, Jiuhou; Wang, Wenbin; Thayer, Jeffrey; Luan, Xiaoli; Dou, Xiankang; Burns, Alan; Solomon, Stanley;
Published by: Journal of Geophysical Research: Space Physics Published on: 08/2014
YEAR: 2014   DOI: 10.1002/2014JA020152
equatorial thermosphere anomaly; geomagnetic activity; ion-neutral coupling; positive ionospheric storm