Small-scale motions over concentrated magnetic regions of the quiet Sun

A 5.5-min time sequence of spectra in the Fe I lines lambda 5576 (magnetically insensitive), lambda 6301.5, and lambda 6302.5 (magnetically sensitive) has been used to study the association of concentrated magnetic regions and velocity in the quiet Sun. After the elimination of photospheric oscillat...

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Bibliographic Details
Published in:Solar physics 1987-02, Vol.109 (1), p.19-29
Main Authors: DARA, H. C, ALISSANDRAKIS, C. E, KOUTCHMY, S
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Other topics on the solar system
Solar system
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Summary:A 5.5-min time sequence of spectra in the Fe I lines lambda 5576 (magnetically insensitive), lambda 6301.5, and lambda 6302.5 (magnetically sensitive) has been used to study the association of concentrated magnetic regions and velocity in the quiet Sun. After the elimination of photospheric oscillations, the authors found downflows of 100-300 m sec super(-) super(1) , displaced by similar to 2" from the peaks of the magnetic field; this velocity is comparable to downflow velocity associated with the granulation of, and of the same order or smaller than, the oscillation amplitude. Quasi-periodic time variations of the vertical component of the magnetic field to plus or minus 40% were also found with a period near 250 sec, close to the values found for the velocity field. A possible association of intensity maxima at the line center with peaks of the oscillation amplitude is reported.
ISSN:0038-0938
1573-093X
DOI:10.1007/BF00167396