A Ring of Polarized Light: Evidence for Twisted Coronal Magnetism in Cavities

Details A Ring of Polarized Light: Evidence for Twisted Coronal Magnetism in Cavities A Ring of Polarized Light: Evidence for Twisted Coronal Magnetism in Cavities

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...731l...1d&link_type=abstract

The Astrophysical Journal Letters, Volume 731, Issue 1, article id. L1 (2011).

Astronomy and Astrophysics

Astronomy

2

Sun: Corona, Sun: Coronal Mass Ejections: Cmes, Sun: Filaments, Prominences, Sun: Infrared, Sun: Magnetic Topology

Scientific paper

Coronal prominence cavities may be manifestations of twisted or sheared magnetic fields capable of storing the energy required to drive solar eruptions. The Coronal Multi-Channel Polarimeter (CoMP), recently installed at Mauna Loa Solar Observatory, can measure polarimetric signatures of current-carrying magnetohydrodynamic (MHD) systems. For the first time, this instrument offers the capability of daily full-Sun observations of the forbidden lines of Fe XIII with high enough spatial resolution and throughput to measure polarimetric signatures of current-carrying MHD systems. By forward-calculating CoMP observables from analytic MHD models of spheromak-type magnetic flux ropes, we show that a predicted observable for such flux ropes oriented along the line of sight is a bright ring of linear polarization surrounding a region where the linear polarization strength is relatively depleted. We present CoMP observations of a coronal cavity possessing such a polarization ring.

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