Promises and Pitfalls of Solar Hα Zeeman Spectropolarimetry

Details Promises and Pitfalls of Solar Hα Zeeman Spectropolarimetry Promises and Pitfalls of Solar Hα Zeeman Spectropolarimetry

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...606.1233b&link_type=abstract

The Astrophysical Journal, Volume 606, Issue 2, pp. 1233-1238.

Astronomy and Astrophysics

Astronomy

11

Sun: Chromosphere, Sun: Magnetic Fields, Techniques: Polarimetric

Scientific paper

Zeeman 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.

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