Hysteresis in solar wind power input to the magnetosphere

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Hysteresis in solar wind power input to the magnetosphere. / Palmroth, Minna; Janhunen, Pekka; Pulkkinen, Tuija I.

In: Geophysical Research Letters, Vol. 33, No. 3, 03107, 14.02.2006.

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@article{47384f64472242dd8a66b495dc79ec83,
title = "Hysteresis in solar wind power input to the magnetosphere",
abstract = "We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field ( IMF) clock angle theta is rotated from 0 degrees to 360 degrees. We find that when the clock angle rotates from north to south, the power input is well represented by sin(2)(theta/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin(2)(theta/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.",
keywords = "GLOBAL MHD SIMULATION, MAGNETIC-FIELD, ENERGY INPUT, MODEL, RECONNECTION, MAGNETOPAUSE",
author = "Minna Palmroth and Pekka Janhunen and Pulkkinen, {Tuija I.}",
year = "2006",
month = "2",
day = "14",
doi = "10.1029/2005GL025188",
language = "English",
volume = "33",
journal = "Geophysical Research Letters",
issn = "0094-8276",
number = "3",

}

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TY - JOUR

T1 - Hysteresis in solar wind power input to the magnetosphere

AU - Palmroth, Minna

AU - Janhunen, Pekka

AU - Pulkkinen, Tuija I.

PY - 2006/2/14

Y1 - 2006/2/14

N2 - We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field ( IMF) clock angle theta is rotated from 0 degrees to 360 degrees. We find that when the clock angle rotates from north to south, the power input is well represented by sin(2)(theta/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin(2)(theta/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.

AB - We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field ( IMF) clock angle theta is rotated from 0 degrees to 360 degrees. We find that when the clock angle rotates from north to south, the power input is well represented by sin(2)(theta/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin(2)(theta/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.

KW - GLOBAL MHD SIMULATION

KW - MAGNETIC-FIELD

KW - ENERGY INPUT

KW - MODEL

KW - RECONNECTION

KW - MAGNETOPAUSE

U2 - 10.1029/2005GL025188

DO - 10.1029/2005GL025188

M3 - Article

VL - 33

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 3

M1 - 03107

ER -

ID: 2606075