Fine strand-like structure in the solar corona from MHD transverse oscillations
TLDR
In this article, the authors show that small amplitude transverse MHD waves can lead in a few periods time to strand-like structure in loops in EUV intensity images, which can be observed for spatial resolutions of a tenth of loop radius.Abstract:
Current analytical and numerical modelling suggest the existence of ubiquitous thin current sheets in the corona that could explain the observed heating requirements. On the other hand, new high resolution observations of the corona indicate that its magnetic field may tend to organise itself in fine strand-like structures of few hundred kilometres widths. The link between small structure in models and the observed widths of strand-like structure several orders of magnitude larger is still not clear. A popular theoretical scenario is the nanoflare model, in which each strand is the product of an ensemble of heating events. Here, we suggest an alternative mechanism for strand generation. Through forward modelling of 3D MHD simulations we show that small amplitude transverse MHD waves can lead in a few periods time to strand-like structure in loops in EUV intensity images. Our model is based on previous numerical work showing that transverse MHD oscillations can lead to Kelvin-Helmholtz instabilities that deform the cross-sectional area of loops. While previous work has focused on large amplitude oscillations, here we show that the instability can occur even for low wave amplitudes for long and thin loops, matching those presently observed in the corona. We show that the vortices generated from the instability are velocity sheared regions with enhanced emissivity hosting current sheets. Strands result as a complex combination of the vortices and the line-of-sight angle, last for timescales of a period and can be observed for spatial resolutions of a tenth of loop radius.read more
Citations
More filters
Journal ArticleDOI
Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding
Valery M. Nakariakov,Valery M. Nakariakov,Vyacheslav Pilipenko,Balázs Heilig,Petr Jelínek,Marian Karlický,Dmitriy Klimushkin,Dmitrii Y. Kolotkov,Dong-Hun Lee,Giuseppe Nisticò,T. Van Doorsselaere,Gary Verth,Ivan Zimovets,Ivan Zimovets,Ivan Zimovets +14 more
TL;DR: Magnetohydrodynamic (MHD) oscillatory processes in different plasma systems, such as the corona of the Sun and the Earth's magnetosphere, show interesting similarities and differences as mentioned in this paper.
Journal ArticleDOI
Decayless low-amplitude kink oscillations : a common phenomenon in the solar corona?
Sergey Anfinogentov,Valery M. Nakariakov,Valery M. Nakariakov,Valery M. Nakariakov,Giuseppe Nisticò +4 more
TL;DR: In this paper, the authors investigated the decayless regime of coronal kink oscillations recently discovered in the Solar Dynamics Observatory (SDO)/AIA data and estimated the prevalence of this phenomenon and its characteristic signatures.
Journal ArticleDOI
Wave heating of the solar atmosphere
TL;DR: The discussion starts with a selection of observational discoveries that have brought magnetic waves to the forefront of the coronal heating discussion and a commentary on how the combination of theory and observations should help to understand and quantify magnetic wave heating of the solar atmosphere.
Journal ArticleDOI
Achievements of Hinode in the first eleven years
Khalid Al-Janabi,Patrick Antolin,Deborah Baker,Luis R. Bellot Rubio,Louisa Bradley,David H. Brooks,Rebecca Centeno,J. Leonard Culhane,Giulio Del Zanna,George A. Doschek,Lyndsay Fletcher,Hirohisa Hara,Louise K. Harra,Andrew Hillier,Andrew Hillier,Shinsuke Imada,James A. Klimchuk,John T. Mariska,Tiago M. D. Pereira,Katharine K. Reeves,Taro Sakao,Taro Sakao,Takashi Sakurai,Toshifumi Shimizu,Toshifumi Shimizu,Masumi Shimojo,Daikou Shiota,Daikou Shiota,Sami K. Solanki,Alphonse C. Sterling,Yingna Su,Yoshinori Suematsu,Theodore D. Tarbell,Sanjiv K. Tiwari,Shin Toriumi,Ignacio Ugarte-Urra,Harry P. Warren,Tetsuya Watanabe,Peter R. Young +38 more
TL;DR: In this article, an open access article distributed under the terms of the Creative Commons CC BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Journal ArticleDOI
Solar Science with the Atacama Large Millimeter/Submillimeter Array—A New View of Our Sun
Sven Wedemeyer,Timothy S. Bastian,Roman Brajša,Hugh S. Hudson,Hugh S. Hudson,Gregory D. Fleishman,Maria Loukitcheva,Maria Loukitcheva,Bernhard Fleck,Eduard P. Kontar,B. De Pontieu,P. Yagoubov,Sanjiv K. Tiwari,Roberto Soler,John H. Black,Patrick Antolin,Eamon Scullion,Stanislav Gunár,Stanislav Gunár,Nicolas Labrosse,Hans-Günter Ludwig,Arnold O. Benz,Stephen M. White,Peter H. Hauschildt,J. G. Doyle,Valery M. Nakariakov,Thomas R. Ayres,P. Heinzel,Marian Karlicky,T. Van Doorsselaere,Dale E. Gary,C. E. Alissandrakis,Alexander Nindos,Sami K. Solanki,Sami K. Solanki,L. Rouppe van der Voort,Masumi Shimojo,Yoshiaki Kato,Teimuraz V. Zaqarashvili,Teimuraz V. Zaqarashvili,E. Perez,Caius L. Selhorst,Miroslav Bárta +42 more
TL;DR: The Atacama Large Millimeter/submillimeter Array (ALMA) as mentioned in this paper is a powerful tool for observing the Sun at high spatial, temporal, and spectral resolution, which can address a broad range of fundamental scientific questions in solar physics.