Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..341z&link_type=abstract
Astronomy and Astrophysics, v.335, p.341-350 (1998)
Astronomy and Astrophysics
Astrophysics
26
Sun: Granulation, Sun: Magnetic Fields, Sun: Photosphere
Scientific paper
By tracing individual elements, we have measured horizontal velocity and studied motion patterns of Intranetwork (IN) magnetic elements for the first time. The magnetograms obtained at Big Bear Solar Observatory span an interval of 10-hour and cover an area of 310x 240 arc sec(2) . In general, IN elements move radially and isotropically outwards from emergence centers to boundaries of supergranule cells at first. However, when they reach halfway between cell centers and boundaries, the motion of IN elements is non-isotropic, there are prior directions. Most of IN elements move towards the edges of network elements. There are two components of the velocity fields: radial velocity and circular velocity. >From the centers to the boundaries of supergranule cells, the magnitude of the radial velocity decreases gradually; but that of the circular velocity increases obviously, at halfway between cell center and boundary, the circular acceleration reachs the maximum, about 10(-1) m s(-2) . The mean circular velocity near the boundary is about 0.4 km s(-1) . The horizontal speeds deduced by tracing 768 intranetwork elements range from 0.05 km s(-1) to 0.8 km s(-1) with a peak distribution at 0.4 km s(-1) . Both within the supergranule cells and on the boundaries, there are convergence centers, but divergence centers always exist within supergranule cells.
Wang Haimin
Wang Jingxiu
Zhang James J.
Zirin Harold
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