Skip to content

Research at St Andrews

In situ generation of transverse magnetohydrodynamic waves from colliding flows in the solar corona

Research output: Contribution to journalArticle

Author(s)

Patrick Antolin, Paolo Pagano, Ineke De Moortel, Valery M. Nakariakov

School/Research organisations

Abstract

Transverse magnetohydrodynamic (MHD) waves permeate the solar atmosphere and are a candidate for coronal heating. However, the origin of these waves is still unclear. In this Letter, we analyze coordinated observations from Hinode/Solar Optical Telescope (SOT) and Interface Region Imaging Spectrograph (IRIS) of a prominence/coronal rain loop-like structure at the limb of the Sun. Cool and dense downflows and upflows are observed along the structure. A collision between a downward and an upward flow with an estimated energy flux of 107–108 erg cm−2 s−1 is observed to generate oscillatory transverse perturbations of the strands with an estimated ≈40 km s−1 total amplitude, and a short-lived brightening event with the plasma temperature increasing to at least 105 K. We interpret this response as sausage and kink transverse MHD waves based on 2D MHD simulations of plasma flow collision. The lengths, density, and velocity differences between the colliding clumps and the strength of the magnetic field are major parameters defining the response to the collision. The presence of asymmetry between the clumps (angle of impact surface and/or offset of flowing axis) is crucial for generating a kink mode. Using the observed values, we successfully reproduce the observed transverse perturbations and brightening, and show adiabatic heating to coronal temperatures. The numerical modeling indicates that the plasma β in this loop-like structure is confined between 0.09 and 0.36. These results suggest that such collisions from counter-streaming flows can be a source of in situ transverse MHD waves, and that for cool and dense prominence conditions such waves could have significant amplitudes.
Close

Details

Original languageEnglish
Article numberL15
JournalAstrophysical Journal Letters
Volume861
Issue number2
DOIs
Publication statusPublished - 9 Jul 2018

    Research areas

  • Magnetohydrodynamics (MHD), Sun: activity, Sun: filaments, prominences, Sun: oscillations, Waves

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Effect of coronal loop structure on wave heating by phase mixing

    Pagano, P., De Moortel, I. & Morton, R., 9 Sep 2020, (Accepted/In press) In : Astronomy & Astrophysics.

    Research output: Contribution to journalArticle

  2. Chromospheric evaporation and phase mixing of Alfvén waves in coronal loops

    Van Damme, H. J., De Moortel, I., Pagano, P. & Johnston, C. D., 31 Mar 2020, In : Astronomy & Astrophysics. 635, 11 p., A174.

    Research output: Contribution to journalArticle

  3. MHD simulations of the in-situ generation of kink and sausage waves in the solar corona by collision of dense plasma clumps

    Pagano, P., Van Damme, H-J., Antolin, P. & De Moortel, I., Jun 2019, In : Astronomy & Astrophysics. 626, 12 p., A53.

    Research output: Contribution to journalArticle

  4. Contribution of phase-mixing of Alfvén waves to coronal heating in multi-harmonic loop oscillations

    Pagano, P., Pascoe, D. J. & De Moortel, I., 29 Aug 2018, In : Astronomy & Astrophysics. 616, 12 p., A125.

    Research output: Contribution to journalArticle

Related by journal

  1. On the Lorentz force and torque of solar photospheric emerging magnetic fields

    Duan, A., Jiang, C., Toriumi, S. & Syntelis, P., 9 Jun 2020, In : Astrophysical Journal Letters. 896, 1, 8 p., L9.

    Research output: Contribution to journalArticle

  2. A fast and accurate method to capture the solar corona/transition region enthalpy exchange

    Johnston, C. D. & Bradshaw, S. J., 15 Mar 2019, In : Astrophysical Journal Letters. 873, 2, L22.

    Research output: Contribution to journalArticle

  3. Kelvin–Helmholtz instability and Alfvénic vortex shedding in solar eruptions

    Syntelis, P. & Antolin, P., 10 Oct 2019, In : Astrophysical Journal Letters. 884, 1, p. 1-7 7 p., L4.

    Research output: Contribution to journalArticle

  4. Sub-arcsecond (sub)millimeter imaging of the massive protocluster G358.93-0.03: discovery of 14 new methanol maser lines associated with a hot core

    Brogan, C. L., Hunter, T. R., Towner, A. P. M., McGuire, B. A., MacLeod, G. C., Gurwell, M. A., Cyganowski, C. J., Brand, J., Burns, R. A., Caratti o Garatti, A., Chen, X., Chibueze, J. O., Hirano, N., Hirota, T., Kim, K. -T., Kramer, B. H., Linz, H., Menten, K. M., Remijan, A., Sanna, A. & 8 others, Sobolev, A. M., Sridharan, T. K., Stecklum, B., Sugiyama, K., Surcis, G., Van der Walt, J., Volvach, A. E. & Volvach, L. N., 20 Aug 2019, In : Astrophysical Journal Letters. 881, 2, L39.

    Research output: Contribution to journalArticle

  5. A cancellation nanoflare model for solar chromospheric and coronal heating

    Priest, E. R., Chitta, L. P. & Syntelis, P., 1 Aug 2018, In : Astrophysical Journal Letters. 862, 2, 7 p., L24.

    Research output: Contribution to journalArticle

ID: 253603983

Top