Results 231 to 240 of about 36,294 (263)

Circular Polarization in a Solar Filament

Solar Physics, 2003
Integrating 26 624 pairs of video frames, the authors have mapped the circular polarization in an active-region filament against the solar disk by using a traditional magnetograph working at the Hβ line. This filament, offset the disk center, appeared at the boundary of three decayed active regions.
Jingxiu Wang, Guiping Zhou, Yuming Wang, Limin Song   +3 more
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Various Barbs in Solar Filaments

Publications of the Astronomical Society of Australia, 2017
AbstractInterest to lateral details of the solar filament shape named barbs, motivated by their relationship to filament chirality and helicity, showed their different orientation relative to the expected direction of the magnetic field. While the majority of barbs are stretched along the field, some barbs seem to be transversal to it and are referred ...
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Small-amplitude oscillations in solar filaments

Astronomy Reports, 2012
The temporal and spatial properties of small-amplitude oscillations have been studied using spectral observations of motions in solar filaments carried out at the Sayan Solar Observatory (Institute of Solar-Terrestrial Physics, Russian Academy of Sciences).
G. P. Mashnich, V. S. Bashkirtsev, A. I. Khlystova   +2 more
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Solar filaments as tracers of subsurface processes

Journal of Astrophysics and Astronomy, 2000
AbstractSolar filaments are discussed in terms of two contrasting paradigms. The standard paradigm is that filaments are formed by condensation of coronal plasma into magnetic fields that are twisted or dimpled as a consequence of motions of the fields’ sources in the photosphere.
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Automatic Solar Filament Segmentation and Characterization

Solar Physics, 2011
This paper presents a generic method to automatically segment and characterize solar filaments from various Hα full-disk solar images, obtained by different solar observatories, with different dynamic ranges and statistical properties. First, a cascading Hough circle detector is designed to find the center location and radius of the solar disks. Second,
Y. Yuan, F. Y. Shih, J. Jing, H. Wang, J. Chae   +4 more
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Eruption of a Bifurcated Solar Filament

Solar Physics, 2013
We study the partial eruption of a solar filament observed by the Solar Dynamics Observatory (SDO) and the Solar TErrestrial RElations Observatory-Ahead (STEREO-A) spacecraft on 9 May 2012. This filament was located in Active Region NOAA 11475 and consisted of two distinct branches, separated in height above the active region’s primary polarity ...
Chunming Zhu, David Alexander
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Filament current systems and solar flares

Solar Physics, 1996
Relationship between the rising movement of the filaments, the evolutions of filament current systems and the flares on 13 May, 1981, 16 May, 1981, and 4 February, 1986, have been studied. We have obtained the following results: (1) The flare-filament current systems show great variety.
Yu-Hua Tang, Lian-Shu Cui, Chun-Lin Yin, Ao-Ao Xu   +3 more
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The corona associated with solar filaments

Solar Physics, 1981
Spectroheliograms in high temperature ions such as Fe XV show the existence of both filaments that are brighter than the ambient corona and filaments that are darker than the ambient corona. The relationship of the filaments to photospheric magnetograms is described, and a possible physical mechanism to explain the differences is discussed.
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Disappearing solar filaments and geomagnetic activity

Solar Physics, 1986
As a sequel to our recent identification of the high-speed stream as the candidate structure in the solar wind at 1 AU, that is primarily responsible for the geomagnetic disturbances occasionally noticed after ‘disparition brusques’ (DBs) of solar filaments (Sastri et al., 1985), we report here that the streams, inferred to be recurrent in our earlier ...
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Planar solitonic filaments in solar physics

Astrophysics and Space Science, 2007
A new class of analytical solution of the coupled system of Da Rios-diffusion equation in magnetohydrodynamic (MHD) representing solitonic vortex filaments is obtained. One of the solutions is similar to the one found by Rogers and Schief describing a solitary wave propagating along a constant torsion vortex filament.
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