The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving

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http://hdl.handle.net/10138/308364

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Lakka , A , Pulkkinen , T I , Dimmock , A P , Myllys , M , Honkonen , I & Palmroth , M 2018 , ' The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving ' , Journal of geophysical research. Space physics , vol. 123 , no. 5 , pp. 3320-3332 . https://doi.org/10.1002/2017JA025054

Title: The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving
Author: Lakka, A.; Pulkkinen, T. I.; Dimmock, A. P.; Myllys, M.; Honkonen, I.; Palmroth, M.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-05
Language: eng
Number of pages: 13
Belongs to series: Journal of geophysical research. Space physics
ISSN: 2169-9380
URI: http://hdl.handle.net/10138/308364
Abstract: It is well known that the Earth's ionospheric cross-polar cap potential (CPCP) saturates as a response to the solar wind (SW) driver especially when the level of driving is high and the interplanetary magnetic field is oriented southward. Moreover, previous studies have shown that the upstream Alfven Mach number may be an important factor in the saturation effect. While the CPCP is often viewed as a measure of the SW-magnetosphere-ionosphere coupling, the processes associated with the nonlinearity of the coupling remain an open issue. We use fourth edition of the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4) and artificial SW data to mimic weak and strong driving in order to study the CPCP response to a wide range of interplanetary magnetic field magnitudes (3.5-30 nT) and upstream Alfven Mach number values (1.2-22). The results provide the first overview of the CPCP saturation in GUMICS-4 and show that the onset of saturation is strongly dependent on the upstream Alfven Mach number and the physical processes responsible for the saturation effect might take place both in the Earth's magnetosheath and in the upstream SW.
Subject: GUMICS-4
global MHD
polar cap potential saturation
Alfven Mach number
solar wind-magnetosphere coupling
reconnection
MAGNETOSPHERE COUPLING EFFICIENCY
INTERPLANETARY MAGNETIC-FIELD
POTENTIAL SATURATION
GEOMAGNETIC STORMS
MHD SIMULATION
IONOSPHERE
DAYSIDE
MODELS
CONDUCTIVITY
MAGNETOPAUSE
115 Astronomy, Space science
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