On the validity of application of the radial approximation for the photospheric field

Details On the validity of application of the radial approximation for the photospheric field On the validity of application of the radial approximation for the photospheric field

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..220....1r&link_type=abstract

Solar Physics, Volume 220, Issue 1, pp.1-20

Physics

4

Scientific paper

The radiality approximation, introduced by Wang and Sheeley (1992), is rather frequently used to calculate within the current-free approximation the magnetic structure of the solar corona. In this paper it is shown that the data that are used as observational evidence of the `radiality' contradict neither the `radiality' nor the `non-radiality' of the measured magnetic field, while to ascertain the true character requires quantifying the standard deviation of the transverse component of the field. On the basis of a statistical processing of daily magnetograms, a method is suggested for quantifying the measure of non-radiality of the observed field. For Stanford magnetograms (Fe i λ5250) and NSO/Kitt Peak magnetograms (Fe i λ8688) it is shown that the measures of non-radiality corresponding to them are equal in magnitude and not small. The only difference between the two lines of measurement is the presence of a small mean azimuthal field in the line of Fe i λ5250, which may be interpreted as an indication of the non-potentiality at the level of measurement lying in deeper layers. Nevertheless, such a non-potentiality does not lead to magnetic field radialization.The final conclusion of this paper: the observational data indicate an essential non-radiality of the magnetic field at the level of measurements and, hence, the classical interpretation of magnetic measurements for extrapolating the magnetic field to the corona is preferred.

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