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Diurnal variations in global Joule heating morphology and magnitude due to neutral winds

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Diurnal variations in global Joule heating morphology and magnitude due to neutral winds. / Billett, D. D.; Grocott, A.; Wild, J. A. et al.

In: Journal of Geophysical Research: Space Physics, Vol. 123, No. 3, 03.2018, p. 2398-2411.

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Billett DD, Grocott A, Wild JA, Walach M, Kosch MJ. Diurnal variations in global Joule heating morphology and magnitude due to neutral winds. Journal of Geophysical Research: Space Physics. 2018 Mar;123(3):2398-2411. Epub 2018 Mar 5. doi: 10.1002/2017JA025141

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Billett, D. D. ; Grocott, A. ; Wild, J. A. et al. / Diurnal variations in global Joule heating morphology and magnitude due to neutral winds. In: Journal of Geophysical Research: Space Physics. 2018 ; Vol. 123, No. 3. pp. 2398-2411.

Bibtex

@article{cf63ae3579c445dd85a9b1c43f1a0dc7,
title = "Diurnal variations in global Joule heating morphology and magnitude due to neutral winds",
abstract = "In the polar ionosphere, variations in Joule heating are significantly controlled by changes in plasma convection, such as that brought about by changes in the interplanetary magnetic field (IMF). However, another important consideration when calculating Joule heating is the velocity difference between this plasma and the neutral thermosphere co-located with the ionosphere. Neutral wind data is often difficult to obtain on a global scale, thus Joule heating has often previously been calculated assuming that neutral velocities are small and can therefore be neglected. Previous work has shown the effect of neutral winds on Joule heating estimations to be more significant than originally thought, however, the diurnal variations of the neutrals due to changes in solar pressure gradients and Coriolis forces have yet to have their impact on Joule heating assessed. We show this universal time (UT) effect to be significant in calculating Joule heating, and thus can differ significantly from that calculated by neglecting the neutrals. In this study, we use empirical models for the neutral wind, conductivities and magnetic field to create northern hemispheric patterns of Joule heating for approximately 800,000 individual plasma convection patterns generated using data from the Super Dual Auroral Radar Network (SuperDARN). From this, a statistical analysis of how Joule heating varies in morphology and magnitude with UT is shown for differing seasons and levels of geomagnetic activity. We find that neutral winds do play a significant role in the morphology and total energy output of Joule heating.",
keywords = "inoosphere, heating, convection, neutrals, thermosphere, IMF",
author = "Billett, {D. D.} and A. Grocott and Wild, {J. A.} and M.-t. Walach and Kosch, {M. J.}",
year = "2018",
month = mar,
doi = "10.1002/2017JA025141",
language = "English",
volume = "123",
pages = "2398--2411",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "3",

}

RIS

TY - JOUR

T1 - Diurnal variations in global Joule heating morphology and magnitude due to neutral winds

AU - Billett, D. D.

AU - Grocott, A.

AU - Wild, J. A.

AU - Walach, M.-t.

AU - Kosch, M. J.

PY - 2018/3

Y1 - 2018/3

N2 - In the polar ionosphere, variations in Joule heating are significantly controlled by changes in plasma convection, such as that brought about by changes in the interplanetary magnetic field (IMF). However, another important consideration when calculating Joule heating is the velocity difference between this plasma and the neutral thermosphere co-located with the ionosphere. Neutral wind data is often difficult to obtain on a global scale, thus Joule heating has often previously been calculated assuming that neutral velocities are small and can therefore be neglected. Previous work has shown the effect of neutral winds on Joule heating estimations to be more significant than originally thought, however, the diurnal variations of the neutrals due to changes in solar pressure gradients and Coriolis forces have yet to have their impact on Joule heating assessed. We show this universal time (UT) effect to be significant in calculating Joule heating, and thus can differ significantly from that calculated by neglecting the neutrals. In this study, we use empirical models for the neutral wind, conductivities and magnetic field to create northern hemispheric patterns of Joule heating for approximately 800,000 individual plasma convection patterns generated using data from the Super Dual Auroral Radar Network (SuperDARN). From this, a statistical analysis of how Joule heating varies in morphology and magnitude with UT is shown for differing seasons and levels of geomagnetic activity. We find that neutral winds do play a significant role in the morphology and total energy output of Joule heating.

AB - In the polar ionosphere, variations in Joule heating are significantly controlled by changes in plasma convection, such as that brought about by changes in the interplanetary magnetic field (IMF). However, another important consideration when calculating Joule heating is the velocity difference between this plasma and the neutral thermosphere co-located with the ionosphere. Neutral wind data is often difficult to obtain on a global scale, thus Joule heating has often previously been calculated assuming that neutral velocities are small and can therefore be neglected. Previous work has shown the effect of neutral winds on Joule heating estimations to be more significant than originally thought, however, the diurnal variations of the neutrals due to changes in solar pressure gradients and Coriolis forces have yet to have their impact on Joule heating assessed. We show this universal time (UT) effect to be significant in calculating Joule heating, and thus can differ significantly from that calculated by neglecting the neutrals. In this study, we use empirical models for the neutral wind, conductivities and magnetic field to create northern hemispheric patterns of Joule heating for approximately 800,000 individual plasma convection patterns generated using data from the Super Dual Auroral Radar Network (SuperDARN). From this, a statistical analysis of how Joule heating varies in morphology and magnitude with UT is shown for differing seasons and levels of geomagnetic activity. We find that neutral winds do play a significant role in the morphology and total energy output of Joule heating.

KW - inoosphere

KW - heating

KW - convection

KW - neutrals

KW - thermosphere

KW - IMF

U2 - 10.1002/2017JA025141

DO - 10.1002/2017JA025141

M3 - Journal article

VL - 123

SP - 2398

EP - 2411

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 3

ER -