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Title: ON THE MAGNETISM AND DYNAMICS OF PROMINENCE LEGS HOSTING TORNADOES

Abstract

Solar tornadoes are dark vertical filamentary structures observed in the extreme ultraviolet associated with prominence legs and filament barbs. Their true nature and relationship to prominences requires an understanding of their magnetic structure and dynamic properties. Recently, a controversy has arisen: is the magnetic field organized forming vertical, helical structures or is it dominantly horizontal? And concerning their dynamics, are tornadoes really rotating or is it just a visual illusion? Here we analyze four consecutive spectro-polarimetric scans of a prominence hosting tornadoes on its legs, which helps us shed some light on their magnetic and dynamical properties. We show that the magnetic field is very smooth in all the prominence, which is probably an intrinsic property of the coronal field. The prominence legs have vertical helical fields that show slow temporal variation that is probably related to the motion of the fibrils. Concerning the dynamics, we argue that (1) if rotation exists, it is intermittent, lasting no more than one hour, and (2) the observed velocity pattern is also consistent with an oscillatory velocity pattern (waves).

Authors:
; ; ;  [1];  [2];  [3]
  1. Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife (Spain)
  2. National Solar Observatory, Sacramento Peak P.O. Box 62, Sunspot, NM 88349 (United States)
  3. Institute for Solar Physics, Department of Astronomy, Stockholm University, Albanova University Center, SE-10691 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22666092
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 825; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHROMOSPHERE; EXTREME ULTRAVIOLET RADIATION; MAGNETIC FIELDS; MAGNETISM; POLARIZATION; ROTATION; STELLAR FLARES; SUN; VELOCITY; VISIBLE RADIATION

Citation Formats

Martínez González, M. J., Ramos, A. Asensio, Arregui, I., Collados, M., Beck, C., and Rodríguez, J. de la Cruz. ON THE MAGNETISM AND DYNAMICS OF PROMINENCE LEGS HOSTING TORNADOES. United States: N. p., 2016. Web. doi:10.3847/0004-637X/825/2/119.
Martínez González, M. J., Ramos, A. Asensio, Arregui, I., Collados, M., Beck, C., & Rodríguez, J. de la Cruz. ON THE MAGNETISM AND DYNAMICS OF PROMINENCE LEGS HOSTING TORNADOES. United States. doi:10.3847/0004-637X/825/2/119.
Martínez González, M. J., Ramos, A. Asensio, Arregui, I., Collados, M., Beck, C., and Rodríguez, J. de la Cruz. Sun . "ON THE MAGNETISM AND DYNAMICS OF PROMINENCE LEGS HOSTING TORNADOES". United States. doi:10.3847/0004-637X/825/2/119.
@article{osti_22666092,
title = {ON THE MAGNETISM AND DYNAMICS OF PROMINENCE LEGS HOSTING TORNADOES},
author = {Martínez González, M. J. and Ramos, A. Asensio and Arregui, I. and Collados, M. and Beck, C. and Rodríguez, J. de la Cruz},
abstractNote = {Solar tornadoes are dark vertical filamentary structures observed in the extreme ultraviolet associated with prominence legs and filament barbs. Their true nature and relationship to prominences requires an understanding of their magnetic structure and dynamic properties. Recently, a controversy has arisen: is the magnetic field organized forming vertical, helical structures or is it dominantly horizontal? And concerning their dynamics, are tornadoes really rotating or is it just a visual illusion? Here we analyze four consecutive spectro-polarimetric scans of a prominence hosting tornadoes on its legs, which helps us shed some light on their magnetic and dynamical properties. We show that the magnetic field is very smooth in all the prominence, which is probably an intrinsic property of the coronal field. The prominence legs have vertical helical fields that show slow temporal variation that is probably related to the motion of the fibrils. Concerning the dynamics, we argue that (1) if rotation exists, it is intermittent, lasting no more than one hour, and (2) the observed velocity pattern is also consistent with an oscillatory velocity pattern (waves).},
doi = {10.3847/0004-637X/825/2/119},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 825,
place = {United States},
year = {2016},
month = {7}
}