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Midterm periods of solar filaments [PDF]
Journal of Geophysical Research: Space Physics, 2014 Abstract On the basis of the Carte Synoptique catalogue of solar filaments from March 1919 to December 1989, we measure power spectra of detrended full‐disk (FSFNs, latitudinal bands: 0 ∘ –90 ∘ ), low‐latitude (LSFNs, latitudinal bands:
Peng Zou, Qixiu Li
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Large-scale motion of solar filaments
Journal of Astrophysics and Astronomy, 2000AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic ...
Pavel Ambrož, Alfred Schroll
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Activity cycle of solar filaments
Journal of Astrophysics and Astronomy, 2007Long-term variation in the distribution of the solar filaments observed at the Observatorie de Paris, Section de Meudon from March 1919 to December 1989 is presented to compare with sunspot cycle and to study the periodicity in the filament activity, namely the periods of the coronal activity with the Morlet wavelet used.
K. J. Li +5 more
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1966
Abstract : A survey was made of the Lockheed solar patrol films in search of any parameters which could possible be linked with the occurrence of flares. High resolution observations ( or = 1 sec of arc) show that some filaments increase in darkness and become more sharply defined within several hours to several days before the onset of a flare ...
Sara F. Smith, Harry E. Ramsey
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Abstract : A survey was made of the Lockheed solar patrol films in search of any parameters which could possible be linked with the occurrence of flares. High resolution observations ( or = 1 sec of arc) show that some filaments increase in darkness and become more sharply defined within several hours to several days before the onset of a flare ...
Sara F. Smith, Harry E. Ramsey
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Cyclical behavior of solar filaments
Astronomische Nachrichten, 2012AbstractThe Carte Synoptique catalogue of solar filaments from 1919 March to 1957 July, corresponding to complete cycles 16‐18, is utilized to show the latitudinal migrations of solar filaments at low (≤50°) and high (>50°) latitudes and the latitudinal distributions of solar filaments for all solar filaments, solar filaments whose maximum lengths ...
P.X. Gao, X.J. Shi, Y. Li
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Failed Eruptions of Solar Filaments
Astronomy Reports, 2020Solar filaments (prominences), which suddenly and swiftly ascend, i.e., become eruptive, sometimes decelerate and stop at comparatively low altitudes. Causes of failed eruptions generally remain uncertain. The present study analyzes two eruptive phenomena with very similar initial geometries and configurations of external magnetic fields; one of these ...
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Circular Polarization in a Solar Filament
Solar Physics, 2003Integrating 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 +3 more
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Thin Threads of Solar Filaments
Solar Physics, 2005High-resolution images obtained in Hα with the new Swedish Solar Telescope at La Palma, Spain, have been used for studies of fine-scale threads in solar filaments. The widths of the thin threads are ≤0.3 arcsec. The fact that the width of the thinnest threads is comparable to the diffraction limit of the telescope of about 0.14 arcsec, at the ...
Yong Lin +4 more
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