Study of small scale magnetic flux and the corresponding velocity pattern

Details Study of small scale magnetic flux and the corresponding velocity pattern Study of small scale magnetic flux and the corresponding velocity pattern

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..533a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 533-538.

Astronomy and Astrophysics

Astrophysics

3

Line Of Sight, Magnetic Flux, Solar Magnetic Field, Solar Oscillations, Two Dimensional Models, Circular Polarization, Data Reduction, Photosphere, Solar Wind, Telescopes

Scientific paper

Two-dimensional maps of the longitudinal magnetic field and the line of sight velocity of two small-scale magnetic regions in the quiet sun, using a one-hour time sequence of filtergrams in the magnetically sensitive lambda 6103 A CaI line (with circular polarization measurements) obtained with the Sacramento Peak Vacuum Tower Telescope and the universal filter, are calculated. After the elimination of the effect of the 5-minute photospheric oscillations, downflows smaller than 300 m/s are found in both magnetic regions. The magnetic field intensity and the velocity are weakly correlated: high values of the magnetic field tend to occur in regions of small negative velocities. The magnetic field intensity increased during the observations, while some magnetic peaks moved with respect to others. The difference of the magnetic field intensity measured in the blue and the red wing indicates a line asymmetry; this asymmetry was found to be independent of the line of sight velocity.

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