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Title: Magnetic tornadoes and chromospheric swirls – Definition and classification
Authors: Wedemeyer, SvenScullion, EamonSteiner, Oskarde la Cruz Rodriguez, JaimeRouppe van der Voort, Luc
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Issue Date: 2013
Published in: Journal of Physics: Conference Series, Volume 440, Issue 1
Eclipse on the Coral Sea: Cycle 24 Ascending 2012 - GONG 2012 / LWS/SDO-5 / SOHO 27, November 12 - 16, 2012, Palm Cove, Queensland, Australia
Publisher: Milton Park : Taylor & Francis
Abstract: Chromospheric swirls are the observational signatures of rotating magnetic field structures in the solar atmosphere, also known as magnetic tornadoes. Swirls appear as dark rotating features in the core of the spectral line of singly ionized calcium at a wavelength of 854.2 nm. This signature can be very subtle and difficult to detect given the dynamic changes in the solar chromosphere. Important steps towards a systematic and objective detection method are the compilation and characterization of a statistically significant sample of observed and simulated chromospheric swirls. Here, we provide a more exact definition of the chromospheric swirl phenomenon and also present a first morphological classification of swirls with three types: (I) Ring, (II) Split, (III) Spiral. We also discuss the nature of the magnetic field structures connected to tornadoes and the influence of limited spatial resolution on the appearance of their photospheric footpoints.
Keywords: Detection methods; Dynamic changes; Morphological classifications; Rotating magnetic fields; Solar atmosphere; Solar chromosphere; Spatial resolution; Spectral line
DDC: 530
License: CC BY 3.0 Unported
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