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Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating

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Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating. / Pagano, Paolo; De Moortel, Ineke.

In: Astronomy & Astrophysics, Vol. 623, A37, 03.2019.

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Pagano, P & De Moortel, I 2019, 'Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating', Astronomy & Astrophysics, vol. 623, A37. https://doi.org/10.1051/0004-6361/201834158

APA

Pagano, P., & De Moortel, I. (2019). Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating. Astronomy & Astrophysics, 623, [A37]. https://doi.org/10.1051/0004-6361/201834158

Vancouver

Pagano P, De Moortel I. Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating. Astronomy & Astrophysics. 2019 Mar;623. A37. https://doi.org/10.1051/0004-6361/201834158

Author

Pagano, Paolo ; De Moortel, Ineke. / Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating. In: Astronomy & Astrophysics. 2019 ; Vol. 623.

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@article{51f3394d78864006854122f7d47ec590,
title = "Contribution of observed multi frequency spectrum of Alfv{\'e}n waves to coronal heating",
abstract = "Context. Whilst there are observational indications that transverse MHD waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfv{\'e}n waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona. Aims. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops. Methods. We consider a 3D MHD model of an active region coronal loop and we perturb its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver is composed of 1000 pulses superimposed to generate the observed power spectrum. Results. We find that the heating supply from the observed power spectrum in the solar corona through phase mixing is not sufficient to maintain the million degree active region solar corona. We also find that the development of Kelvin-Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time. Conclusions. This study concludes that is unlikely that phase-mixing of Alfv{\'e}n waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures. ",
keywords = "Magnetohydrodynamics (MHD), Sun: atmosphere, Sun: corona, Sun: magnetic fields, Sun: oscillations, Waves",
author = "Paolo Pagano and {De Moortel}, Ineke",
year = "2019",
month = mar,
doi = "10.1051/0004-6361/201834158",
language = "English",
volume = "623",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP SCIENCES S A",

}

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TY - JOUR

T1 - Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating

AU - Pagano, Paolo

AU - De Moortel, Ineke

PY - 2019/3

Y1 - 2019/3

N2 - Context. Whilst there are observational indications that transverse MHD waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfvén waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona. Aims. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops. Methods. We consider a 3D MHD model of an active region coronal loop and we perturb its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver is composed of 1000 pulses superimposed to generate the observed power spectrum. Results. We find that the heating supply from the observed power spectrum in the solar corona through phase mixing is not sufficient to maintain the million degree active region solar corona. We also find that the development of Kelvin-Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time. Conclusions. This study concludes that is unlikely that phase-mixing of Alfvén waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures.

AB - Context. Whilst there are observational indications that transverse MHD waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfvén waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona. Aims. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops. Methods. We consider a 3D MHD model of an active region coronal loop and we perturb its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver is composed of 1000 pulses superimposed to generate the observed power spectrum. Results. We find that the heating supply from the observed power spectrum in the solar corona through phase mixing is not sufficient to maintain the million degree active region solar corona. We also find that the development of Kelvin-Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time. Conclusions. This study concludes that is unlikely that phase-mixing of Alfvén waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures.

KW - Magnetohydrodynamics (MHD)

KW - Sun: atmosphere

KW - Sun: corona

KW - Sun: magnetic fields

KW - Sun: oscillations

KW - Waves

U2 - 10.1051/0004-6361/201834158

DO - 10.1051/0004-6361/201834158

M3 - Article

VL - 623

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A37

ER -

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