Evidence for a Siphon Flow Ending near the Edge of a Pore

Details Evidence for a Siphon Flow Ending near the Edge of a Pore Evidence for a Siphon Flow Ending near the Edge of a Pore

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...645..776u&link_type=abstract

The Astrophysical Journal, Volume 645, Issue 1, pp. 776-781.

Astronomy and Astrophysics

Astronomy

10

Line: Formation, Magnetic Fields, Polarization, Radiative Transfer, Sun: Chromosphere, Sun: Photosphere

Scientific paper

Observations of NOAA AR 9431, taken with the Vacuum Tower at Kitt Peak on 2001 April 18 in the Ca II 854.21 nm line in both circular polarizations, show evidence for a strong supersonic downflow ending near the edge of a magnetic pore. The observed supersonic motion is interpreted as a siphon flow along a magnetic loop connecting a patch of weaker field to the pore of opposite polarity in the same active region. The 854.21 nm line data reveal the upflow at one footpoint of the loop, as well as the acceleration of the flow toward the footpoint at the pore, where the flow reaches line-of-sight velocities of well over 20 km s-1, substantially larger than the critical speed. Numerical radiative transfer modeling of the 854.21 nm line indicates the presence of a strong discontinuity in the flow velocity, which we interpret as evidence for a tube shock in the downwind leg of the siphon.

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