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

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The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving. / Lakka, A.; Pulkkinen, T. I.; Dimmock, A. P.; Myllys, M.; Honkonen, I.; Palmroth, M.

In: Journal of geophysical research: Space physics, Vol. 123, No. 5, 05.2018, p. 3320-3332.

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Lakka, A. ; Pulkkinen, T. I. ; Dimmock, A. P. ; Myllys, M. ; Honkonen, I. ; Palmroth, M. / The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving. In: Journal of geophysical research: Space physics. 2018 ; Vol. 123, No. 5. pp. 3320-3332.

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@article{c249a3483b4e41ccad6c852c1d82752b,
title = "The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving",
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 Alfv{\'e}n 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 Alfv{\'e}n 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 Alfv{\'e}n 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.",
keywords = "Alfv{\'e}n Mach number, Global MHD, GUMICS-4, Polar cap potential saturation, Reconnection, Solar wind-magnetosphere coupling",
author = "A. Lakka and Pulkkinen, {T. I.} and Dimmock, {A. P.} and M. Myllys and I. Honkonen and M. Palmroth",
year = "2018",
month = "5",
doi = "10.1002/2017JA025054",
language = "English",
volume = "123",
pages = "3320--3332",
journal = "Journal of geophysical research: Space physics",
issn = "2169-9380",
number = "5",

}

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TY - JOUR

T1 - The Cross-Polar Cap Saturation in GUMICS-4 During High Solar Wind Driving

AU - Lakka, A.

AU - Pulkkinen, T. I.

AU - Dimmock, A. P.

AU - Myllys, M.

AU - Honkonen, I.

AU - Palmroth, M.

PY - 2018/5

Y1 - 2018/5

N2 - 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 Alfvén 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 Alfvén 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 Alfvén 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.

AB - 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 Alfvén 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 Alfvén 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 Alfvén 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.

KW - Alfvén Mach number

KW - Global MHD

KW - GUMICS-4

KW - Polar cap potential saturation

KW - Reconnection

KW - Solar wind-magnetosphere coupling

UR - http://www.scopus.com/inward/record.url?scp=85046375516&partnerID=8YFLogxK

U2 - 10.1002/2017JA025054

DO - 10.1002/2017JA025054

M3 - Article

VL - 123

SP - 3320

EP - 3332

JO - Journal of geophysical research: Space physics

JF - Journal of geophysical research: Space physics

SN - 2169-9380

IS - 5

ER -

ID: 21287728