Magnetosheath control of solar wind-magnetosphere coupling efficiency

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Magnetosheath control of solar wind-magnetosphere coupling efficiency. / Pulkkinen, T. I.; Dimmock, A. P.; Lakka, A.; Osmane, A.; Kilpua, E.; Myllys, M.; Tanskanen, E. I.; Viljanen, A.

In: Journal of geophysical research: Space physics, Vol. 121, No. 9, 01.09.2016, p. 8728-8739.

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Pulkkinen, T. I. ; Dimmock, A. P. ; Lakka, A. ; Osmane, A. ; Kilpua, E. ; Myllys, M. ; Tanskanen, E. I. ; Viljanen, A. / Magnetosheath control of solar wind-magnetosphere coupling efficiency. In: Journal of geophysical research: Space physics. 2016 ; Vol. 121, No. 9. pp. 8728-8739.

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@article{14af32fb2d8a446cbcc46bb17ac2453d,
title = "Magnetosheath control of solar wind-magnetosphere coupling efficiency",
abstract = "We examine the role of the magnetosheath in solar wind-magnetosphere-ionosphere coupling using the Time History of Events and Macroscale Interactions during Substorms plasma and magnetic field observations in the magnetosheath together with OMNI solar wind data and auroral electrojet recordings from the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometer chain. We demonstrate that the electric field and Poynting flux reaching the magnetopause are not linear functions of the electric field and Poynting flux observed in the solar wind: the electric field and Poynting flux at the magnetopause during higher driving conditions are lower than those predicted from a linear function. We also show that the Poynting flux normal to the magnetopause is linearly correlated with the directly driven part of the auroral electrojets in the ionosphere. This indicates that the energy entering the magnetosphere in the form of the Poynting flux is directly responsible for driving the electrojets. Furthermore, we argue that the polar cap potential saturation discussed in the literature is associated with the way solar wind plasma gets processed during the bow shock crossing and motion within the magnetosheath.",
keywords = "magnetosheath, Poynting flux, solar wind - magnetosphere coupling",
author = "Pulkkinen, {T. I.} and Dimmock, {A. P.} and A. Lakka and A. Osmane and E. Kilpua and M. Myllys and Tanskanen, {E. I.} and A. Viljanen",
year = "2016",
month = "9",
day = "1",
doi = "10.1002/2016JA023011",
language = "English",
volume = "121",
pages = "8728--8739",
journal = "Journal of geophysical research: Space physics",
issn = "2169-9380",
number = "9",

}

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TY - JOUR

T1 - Magnetosheath control of solar wind-magnetosphere coupling efficiency

AU - Pulkkinen, T. I.

AU - Dimmock, A. P.

AU - Lakka, A.

AU - Osmane, A.

AU - Kilpua, E.

AU - Myllys, M.

AU - Tanskanen, E. I.

AU - Viljanen, A.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - We examine the role of the magnetosheath in solar wind-magnetosphere-ionosphere coupling using the Time History of Events and Macroscale Interactions during Substorms plasma and magnetic field observations in the magnetosheath together with OMNI solar wind data and auroral electrojet recordings from the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometer chain. We demonstrate that the electric field and Poynting flux reaching the magnetopause are not linear functions of the electric field and Poynting flux observed in the solar wind: the electric field and Poynting flux at the magnetopause during higher driving conditions are lower than those predicted from a linear function. We also show that the Poynting flux normal to the magnetopause is linearly correlated with the directly driven part of the auroral electrojets in the ionosphere. This indicates that the energy entering the magnetosphere in the form of the Poynting flux is directly responsible for driving the electrojets. Furthermore, we argue that the polar cap potential saturation discussed in the literature is associated with the way solar wind plasma gets processed during the bow shock crossing and motion within the magnetosheath.

AB - We examine the role of the magnetosheath in solar wind-magnetosphere-ionosphere coupling using the Time History of Events and Macroscale Interactions during Substorms plasma and magnetic field observations in the magnetosheath together with OMNI solar wind data and auroral electrojet recordings from the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometer chain. We demonstrate that the electric field and Poynting flux reaching the magnetopause are not linear functions of the electric field and Poynting flux observed in the solar wind: the electric field and Poynting flux at the magnetopause during higher driving conditions are lower than those predicted from a linear function. We also show that the Poynting flux normal to the magnetopause is linearly correlated with the directly driven part of the auroral electrojets in the ionosphere. This indicates that the energy entering the magnetosphere in the form of the Poynting flux is directly responsible for driving the electrojets. Furthermore, we argue that the polar cap potential saturation discussed in the literature is associated with the way solar wind plasma gets processed during the bow shock crossing and motion within the magnetosheath.

KW - magnetosheath

KW - Poynting flux

KW - solar wind - magnetosphere coupling

UR - http://www.scopus.com/inward/record.url?scp=84989284881&partnerID=8YFLogxK

U2 - 10.1002/2016JA023011

DO - 10.1002/2016JA023011

M3 - Article

VL - 121

SP - 8728

EP - 8739

JO - Journal of geophysical research: Space physics

JF - Journal of geophysical research: Space physics

SN - 2169-9380

IS - 9

ER -

ID: 9175004