Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..109...19d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 109, no. 1, 1987, p. 19-29. CNRS-supported research.
Physics
9
Magnetic Flux, Solar Magnetic Field, Solar Oscillations, Solar Velocity, Velocity Distribution, Doppler Effect, Grain Boundaries, Line Of Sight
Scientific paper
The authors have used a 5.5 min time-sequence of spectra in the Fe I lines λ5576 (magnetically insensitive), λ6301.5 and λ6302.5 (magnetically sensitive) to study the association of concentrated magnetic regions and velocity in the quiet Sun. After the elimination of photospheric oscillations they found downflows of 100 - 300 m s-1, displaced by about 2arcsec from the peaks of the magnetic field; this velocity is comparable to downflow velocity associated with the granulation and of the same order or smaller than the oscillation amplitude. Quasi-periodic time variations of the vertical component of the magnetic field up to ±40% were also found with a period near 250 s, 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.
Alissandrakis Constantine E.
Dara H. C.
Koutchmy Serge
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