Journal ArticleDOI
Chirality of Chromospheric Filaments
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TLDR
In this article, the authors used the chromospheric full-disk Hα observations to study the chirality of 2310 filaments from 2000-2001 and found that 80.2% (558 out of 696) of quiescent filaments in the northern hemisphere are dextral and 85.5% (633 out of 740) of filament in the southern hemisphere are sinistral, in agreement with the well-known hemispheric helicity rule.Abstract:
We use the chromospheric full-disk Hα observations to study the chirality of 2310 filaments from 2000-2001. For each filament, we identify the spine and its barbs and determine the filament chirality as fraction of dextral/sinistral barbs of the total number of barbs. We find that 80.2% (558 out of 696) of quiescent filaments in the northern hemisphere are dextral and 85.5% (633 out of 740) of filaments in southern hemisphere are sinistral, in agreement with the well-known hemispheric helicity rule. Our data also show that the active-region filaments follow the same rule, though the hemispheric dependence is weaker: 74.9% (338 out of 451) of active-region filaments in the northern hemisphere are dextral, and 76.7% (297 out of 387) of filaments in the southern hemisphere are sinistral. We show that quiescent filaments formed on leading and returning arms of the same switchback exhibit the same chirality. We also investigate a possible change in the hemispheric rule with polarity reversal of the polar field, and we find no such change.read more
Citations
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Solar Flares: Magnetohydrodynamic Processes
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Physics of Solar Prominences: II—Magnetic Structure and Dynamics
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Global-Scale Turbulent Convection and Magnetic Dynamo Action in the Solar Envelope
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The Sun’s Global Photospheric and Coronal Magnetic Fields:Observations and Models
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Slow rise and partial eruption of a double-decker filament. i. observations and interpretation
Rui Liu,Rui Liu,Bernhard Kliem,Bernhard Kliem,Tibor Torok,Chang Liu,Viacheslav S. Titov,Roberto Lionello,Jon A. Linker,Haimin Wang +9 more
TL;DR: In this paper, an active-region dextral filament was modeled as a double-decker configuration with two branches separated in height by about 13 meters, as inferred from three-dimensional reconstruction by combining SDO and STEREO-B observations.
References
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Journal ArticleDOI
Latitudinal variation of helicity of photospheric magnetic fields
TL;DR: In this article, the average magnetic helicity of 69 diverse active regions, adopting the linear force-free field parameter alpha as a measure, was determined by minimizing the differences between the computed constant-alpha force free and observed horizontal magnetic fields.
BookDOI
Solar Surface Magnetism
TL;DR: Magnetic Elements R.H. Muller, L.A. Title, T.D.W. Smith, Z.I. Sheeley Jr., Y.-M.
Journal ArticleDOI
Magnetic Flux Transport and the Formation of Filament Channels on the Sun
TL;DR: In this paper, a model of global magnetic flux transport that includes the effects of differential rotation, meridional flow, and magnetic diffusion on photospheric and coronal fields is presented.
Book ChapterDOI
Magnetic Field Configurations Basic to Filament Channels and Filaments
TL;DR: In this article, the authors identify a fundamental rotational magnetic field configuration observed or deduced to be common to all filament channels, which is characterized by a nearly horizontal magnetic field along the channel axis where a filament can form in coincidence with the zone between opposite polarity line-of-sight magnetic fields.
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