Transverse Wave Induced Kelvin-Helmholtz Rolls in Spicules
TLDR
In this article, the role of transverse MHD waves and associated instabilities in spicule-like features was analyzed and it was shown that transverse wave induced TWIKH rolls lead to coherence of strand-like structure in imaging and spectral maps, as seen in some observations.Abstract:
In addition to their jet-like dynamic behavior, spicules usually exhibit strong transverse speeds, multi-stranded structure, and heating from chromospheric to transition region temperatures. In this work we first analyze Hinode and IRIS observations of spicules and find different behaviors in terms of their Doppler velocity evolution and collective motion of their sub-structure. Some have a Doppler shift sign change that is rather fixed along the spicule axis, and lack coherence in the oscillatory motion of strand-like structure, matching rotation models, or long-wavelength torsional Alfven waves. Others exhibit a Doppler shift sign change at maximum displacement and coherent motion of their strands, suggesting a collective magnetohydrodynamic (MHD) wave. By comparing with an idealized 3D MHD simulation combined with radiative transfer modeling, we analyze the role of transverse MHD waves and associated instabilities in spicule-like features. We find that transverse wave induced Kelvin–Helmholtz (TWIKH) rolls lead to coherence of strand-like structure in imaging and spectral maps, as seen in some observations. The rapid transverse dynamics and the density and temperature gradients at the spicule boundary lead to ring-shaped Mg ii k and Ca ii H source functions in the transverse cross-section, potentially allowing IRIS to capture the Kelvin–Helmholtz instability dynamics. Twists and currents propagate along the spicule at Alfvenic speeds, and the temperature variations within TWIKH rolls, produce the sudden appearance/disappearance of strands seen in Doppler velocity and in Ca ii H intensity. However, only a mild intensity increase in higher-temperature lines is obtained, suggesting there is an additional heating mechanism at work in spicules.read more
Citations
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Alfven Waves in the Solar Corona
Steven Tomczyk,Scott W. McIntosh,Stephen L. Keil,Philip G. Judge,Thomas A. Schad,D. H. Seeley,J. Edmondson +6 more
TL;DR: An estimate of the energy carried by the waves that are spatially resolved indicates that they are too weak to heat the solar corona; however, unresolved Alfvén waves may carry sufficient energy.
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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.
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A New View of the Solar Interface Region from the Interface Region Imaging Spectrograph (IRIS)
Bart De Pontieu,Vanessa Polito,Viggo Hansteen,Paola Testa,Katharine K. Reeves,Patrick Antolin,Daniel Nóbrega-Siverio,Adam F. Kowalski,Juan Martinez-Sykora,Mats Carlsson,Scott W. McIntosh,Wei Liu,Adrian N. Daw,Charles C. Kankelborg +13 more
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Kink Oscillations of Coronal Loops
Valery M. Nakariakov,Valery M. Nakariakov,Valery M. Nakariakov,Sergey Anfinogentov,Patrick Antolin,Rajmal Jain,Dmitrii Y. Kolotkov,Elena G. Kupriyanova,Dong Li,Dong Li,Norbert Magyar,Giuseppe Nisticò,D. J. Pascoe,Abhishek K. Srivastava,J. Terradas,S. Vasheghani Farahani,Gary Verth,Ding Yuan,Ivan Zimovets +18 more
TL;DR: Kink oscillations of coronal loops, i.e., standing kink waves, is one of the most studied dynamic phenomena in the solar corona as mentioned in this paper, and the oscillations are excited by impulsive energy releases.
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Heating Effects from Driven Transverse and Alfvén Waves in Coronal Loops
Mingzhe Guo,Mingzhe Guo,Tom Van Doorsselaere,Konstantinos Karampelas,Bo Li,Patrick Antolin,Ineke De Moortel +6 more
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