Magnetic field strength and inclination in the penumbral fine-structure

Details Magnetic field strength and inclination in the penumbral fine-structure Magnetic field strength and inclination in the penumbral fine-structure

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..197..227w&link_type=abstract

Solar Physics, v. 197, Issue 2, p. 227-234 (2000).

Physics

13

Scientific paper

The uncertainty about a possible correlation between magnetic field strength, inclination, and the continuum intensity of sunspot penumbral fine-structure has been removed from detailed analysis of a spatially very well-resolved spectrum: the darker, long penumbral lanes host a 10% stronger and <=30° flatter magnetic field as compared to the field in bright penumbral locations. This finding is not only based on the high spatial resolution but also on the use of a spectral line, here Fe 6842.7 Å, obtaining its essential contribution from those deep layers where the penumbral structure is seen, i.e. the continuum intensity level. The almost perfect correlation establishes that the penumbral structure is formed by the two magnetic components mainly differing by the field inclination. The different results from other Zeeman lines, as, e.g., Fe 6302.5 Å, indicate a different field structure above the white-light penumbral layers.

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