K. S. Balasubramaniam et al. 2004 ApJ 606 1233 doi:10.1086/383118
K. S. Balasubramaniam1, E. B. Christopoulou1,2 and H. Uitenbroek1
Show affiliationsZeeman spectropolarimetry of the solar disk in the Hα line is a daunting, yet promising diagnostic for measuring solar chromospheric magnetic fields. As a demonstration of its potential we used the National Solar Observatory (NSO)/High Altitude Observatory (HAO) Advanced Stokes Polarimeter to obtain simultaneous measurements of polarimetric signals from the photosphere in the Fe I 6301.5, 6302.5 Å lines and from the chromosphere in Hα. With these measurements, we explore the promises and pitfalls of Hα Zeeman spectropolarimetry. Remarkable features observed in Hα include a reversal of Zeeman polarity in the emission core across flaring active regions and highly redshifted and smeared Stokes V profiles in prominences. We reproduce the Hα Zeeman reversals using radiative transfer diagnostics, and we compare photospheric and chromospheric line-of-sight magnetic fields.
Sun: chromosphere; Sun: magnetic fields; techniques: polarimetric
Issue 2 (2004 May 10)
Received 2004 January 2, accepted for publication 2004 January 22
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