The magnetic structure of solar prominence cavities: New observational signature revealed by coronal magnetometry

AMS Citation:
Bak-Steslicka, U., S. E. Gibson, Y. Fan, C. Bethge, B. Forland, and L. A. Rachmeler, 2013: The magnetic structure of solar prominence cavities: New observational signature revealed by coronal magnetometry. The Astrophysical Journal Letters, 770, doi:10.1088/2041-8205/770/2/L28.
Date:2013-06-20
Resource Type:article
Title:The magnetic structure of solar prominence cavities: New observational signature revealed by coronal magnetometry
Abstract: The Coronal Multi-Channel Polarimeter (CoMP) obtains daily full-Sun above-the-limb coronal observations in linear polarization, allowing, for the first time, a diagnostic of the coronal magnetic field direction in quiescent prominence cavities. We find that these cavities consistently possess a characteristic "lagomorphic" signature in linear polarization indicating twist or shear extending up into the cavity above the neutral line. We demonstrate that such a signature may be explained by a magnetic flux-rope model, a topology with implications for solar eruptions. We find corroborating evidence for a flux-rope structure in the pattern of concentric rings within cavities seen in CoMP line-of-sight velocity.
Peer Review:Refereed
Copyright Information:Copyright 2013 the American Astronomical Society.
OpenSky citable URL: ark:/85065/d7p84cr1
Publisher's Version: 10.1088/2041-8205/770/2/L28
Author(s):
  • Urszula Bak-Steslicka - NCAR/UCAR
  • Sarah Gibson - NCAR/UCAR
  • Yuhong Fan - NCAR/UCAR
  • Christian Bethge - NCAR/UCAR
  • Blake Forland
  • Laurel Rachmeler
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