Weak magnetic flux features on the Sun

Details Weak magnetic flux features on the Sun Weak magnetic flux features on the Sun

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...385..264h&link_type=abstract

Astronomy and Astrophysics, v.385, p.264-272 (2002)

Astronomy and Astrophysics

Astrophysics

4

Sun: Photosphere, Magnetic Fields, Techniques: Polarimetric

Scientific paper

We observed weak magnetic flux in enhanced Ca K network and in its surroundings at various positions on the solar disc (cos theta =1.0dots0 .1). The Gregory Coudé Telescope at the Observatorio del Teide on Tenerife was used together with an image scanner and a Stokes V polarimeter. 1/2(Ilambda +/- Vlambda ) spectrograms in the 6302 Å region were taken. A second order flat fielding and smoothing brought the polarimetric sensitivity to a detection limit of 0.001 Ic (with Ic = continuum intensity) for exposure times of 300 ms in pixels corresponding to 0.5''x0.19'' (widehat = slit width x pixel size of detector). We present correlations between continuum intensity, line center intensity, and magnetic flux and discuss Stokes V profiles. The V amplitude asymmetry from areas with strong flux decreases towards the limb, a change of sign is not identified. The magnetic fields are ordered around strong flux centers with decreasing mean field strength outwards from the centers. In the range of 1x 1016 Mx to 5x 1016 Mx (in one pixel of 5x 1014 cm2) the probability distribution of the magnetic flux is ~ |Phi |-q with q~3, different from a Gaussian distribution. From this we derive tentativily a radial dependence from the flux centers of the form Phi (r) ~ 1/r. For the probability distributions a significant center-to-limb variation is not detected. Together with the center-to-limb behaviour of the asymmetries, we interpret this tentatively as an isotropic orientation of the weak magnetic flux elements and of the gas flows. A vertical orientation of the magnetic fields is also compatible with the measurements, though.

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