Explicit IMF By‐Dependence in Geomagnetic Activity: Quantifying Ionospheric Electrodynamics

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 s...

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Veröffentlicht in:Journal of geophysical research. Space physics 2021-04, Vol.126 (4), p.n/a
Hauptverfasser: Holappa, L., Robinson, R. M., Pulkkinen, A., Asikainen, T., Mursula, K.
Format: Artikel
Sprache:eng
Schlagworte:
Auroral electrojet
Auroral electrojets
Conductance
Continuity equation
Coupling
Electrodynamics
Electrojets
field‐aligned currents
Geomagnetic activity
Geomagnetism
Interplanetary magnetic field
Ionospheric models
Magnetic fields
Magnetospheres
magnetosphere‐ionosphere coupling
Northern Hemisphere
Resistance
Solar magnetic field
Solar wind
space weather
Summer
Winter
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Zusammenfassung: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 > 0 than for By 
ISSN:2169-9380
2169-9402
DOI:10.1029/2021JA029202