Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...685.1262m&link_type=abstract
The Astrophysical Journal, Volume 685, Issue 2, pp. 1262-1269.
Astronomy and Astrophysics
Astronomy
36
Sun: Solar Wind, Sun: Corona, Sun: Magnetic Fields, Sun: Transition Region, Sun: Uv Radiation
Scientific paper
In this study new results are presented regarding the relationships between the coronal magnetic field and the intensities and Doppler shifts of ultraviolet emission lines. This combination of magnetic field and spectroscopic data is used here to study material flows in association with the coronal field. We introduce the term ``coronal circulation'' to describe this flow, and to indicate that the plasma is not static but flows everywhere in the extended solar atmosphere. The blueshifts and redshifts often seen in transition region and coronal ultraviolet emission lines are interpreted as corresponding to upflows and downflows of the plasma on open (funnels) and closed (loops) coronal magnetic field lines, which tightly confine and strongly lead the flows in the low-beta plasma. Evidence for these processes exists in the ubiquitous redshifts mostly seen at both legs of loops on all scales, and the sporadic blueshifts occurring in strong funnels. Therefore, there is no static magnetically stratified plasma in the corona, since panta rhei, but rather a continuous global plasma circulation, being the natural perpetuation of photospheric convection which ultimately is the driver.
Curdt Werner
Marsch Eckart
Sun Jian
Tian Hui
Wiegelmann Thomas
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