Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...563.1031s&link_type=abstract
The Astrophysical Journal, Volume 563, Issue 2, pp. 1031-1044.
Astronomy and Astrophysics
Astronomy
28
Line: Profiles, Polarization, Sun: Faculae, Plages, Sun: Magnetic Fields, Sun: Photosphere
Scientific paper
Between 5% and 10% of Stokes V profiles observed outside of sunspots with the High Altitude Observatory/National Solar Observatory Advanced Stokes Polarimeter are of unusual shape. We categorize them as follows. Normal profiles have two wings of opposite sign that typically show an asymmetry between both lobes. Single-lobed profiles have an amplitude above the noise level only for one wing. Single-lobed profiles occur because of a strong asymmetry between the red and blue wings in combination with low signal amplitude and the limited sensitivity of the measurement. The strongest verifiable amplitude asymmetry found is 90%. Mixed-polarity profiles are the most common type of unusual profiles. These profiles can occur because of the unresolved mixture of polarities in the solar atmosphere on spatial scales <=600 km or because of the spreading of V signals due to seeing and diffraction. Single-lobed profiles and mixed polarities are mainly found outside high magnetic flux areas. Dynamic profiles consist of two or more superposed components with large Doppler shifts relative to each other. They are mainly observed in an emerging flux region. The measured relative Doppler shifts range up to 18 km s-1, indicating upward and downward moving shocks in magnetic fields. We propose two possible configurations for network and plage fields: (1) a mixture of intense kilogauss flux tubes and a more turbulent subkilogauss field and (2) return flux in the form of weak fields surrounding isolated flux tubes and at the edges of flux tube clusters. Both configurations are supported by the analysis of V profiles in the vicinity of an isolated kilogauss flux tube. We find that the use of low-order adaptive optics reduces the uncertainties in interpreting Stokes data.
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