Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..375b&link_type=abstract
In NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields p 375-378 (SEE N85-29869 18-92)
Physics
4
Field Strength, Linear Polarization, Solar Magnetic Field, Solar Prominences, Vector Analysis, Azimuth, Line Of Sight, Spectrophotometry, Spectrum Analysis, Statistical Analysis
Scientific paper
The Hanle effect method for magnetic field vector diagnostics has now provided results on the magnetic field strength and direction in quiescent prominences, from linear polarization measurements in the He I E3 line, performed at the Pic-du-Midi and at Sacramento Peak. However, there is an inescapable ambiguity in the field vector determination: each polarization measurement provides two field vector solutions symmetrical with respect to the line-of-sight. A statistical analysis capable of solving this ambiguity was applied to the large sample of prominences observed at the Pic-du-Midi (Leroy, et al., 1984); the same method of analysis applied to the prominences observed at Sacramento Peak (Athay, et al., 1983) provides results in agreement on the most probable magnetic structure of prominences; these results are detailed. The statistical results were confirmed on favorable individual cases: for 15 prominences observed at Pic-du-Midi, the two-field vectors are pointing on the same side of the prominence, and the alpha angles are large enough with respect to the measurements and interpretation inaccuracies, so that the field polarity is derived without any ambiguity.
Bommier Veronique
Leroy Jean-Louis
Sahal-Bréchot Sylvie
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