Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..674f&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Other
Scientific paper
Magnetic fields influence and drive the activity in stellar atmospheres. In the optical they can be measured via Zeeman and Hanle effect which are relevant in different magnetic field regimes and thus complement each other. The Zeeman effect is sensitive to the net magnetic flux in the resolution element whereas the Hanle effect allows to detect weak directed or entangled magnetic fields. On the Sun Hanle effect is observed in prominences in strong chromospheric lines as well as in many photospheric lines. Especially in the photosphere Hanle effect observations have led to a new paradigm of the magnetic field structure. There 99 percent of the volume are filled by relatively weak entangled fields of the order of a few Gauss to which Zeeman effect observations are pracitcally blind but which are clearly detected by the Hanle effect. We find that molecular lines are particularly well suited for magnetic field diagnostics with the Hanle effect. In molecular bands closeby lines with different sensitivities to the magnetic field form under very similar conditions and can be observed in a single image. Therefore many potential instrumental and physical sources of errors can be eliminated.
Berdyugina Svetlana V.
Fluri D. M.
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