Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..381b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 2, June 1986, p. 381-386.
Astronomy and Astrophysics
Astrophysics
6
Solar Activity, Solar Magnetic Field, Solar Oscillations, Sunspots, Phase Coherence, Photosphere, Solar Velocity
Scientific paper
Based on observations obtained on September 12, 1984, Berton's (1985) theoretical model is used to analyze the line-of-sight component of the steady velocity fields, and its spatial correlation with the magnetic field, in an active region. Five-minute oscillations extracted from the raw data are found to be the essential contribution to wave fluctuations. Most probable distances between two maxima of the line-of-sight component of the velocity (32 arcsec), and of the magnetic field (28 arcsec), are derived, in addition to the most probable distance between a maximum of the line-of-sight component of the magnetic field and of the velocity (30 arcsec). Preferential directions perpendicular to the direction of the disk center, and characteristic lengthscales, are given, and time correlations confirm the evolution times of the line-of-sight components of the velocity fields.
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