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| Paper: |
He I Spectropolarimetry with FIRS: Towards Vector Magnetometry of Chromospheric Fibrils Plus New Diagnostics of Coronal Rain |
| Volume: |
463, 2nd ATST-EAST Workshop in Solar Physics: Magnetic Fields from the Photosphere to the Corona |
| Page: |
25 |
| Authors: |
Schad, T. A.; Penn, M. J.; Lin, H.; Tritschler, A. |
| Abstract: |
At the Dunn Solar Telescope, the Interferometric Bidimensional
Spectrometer (IBIS) can measure the full Stokes vector of the Ca II 854.2 nm
spectral line while the Facility Infrared Spectropolarimeter
(FIRS) measures the Stokes vector of the He I triplet at 1083 nm. We
analyze the He I triplet observed in two widely different features
above NOAA AR 11295 on 19 September 2011 – thin (< 1″)
chromospheric fibrils and a large-scale loop hosting a high-velocity
coronal rain event. These two features are shown to first demonstrate
the diagnostic potential of the He I triplet for magnetic fields in
the chromosphere/transition region and second to stress the need to
pair large-aperture facilities with flexible instrumentation.
Inversions of the He I triplet near the penumbral boundary return
azimuthal directions of the magnetic field aligned with fine-scale
fibrils observed in the line core of Ca II. The coronal rain event
shows Doppler velocities up to 195 km s-1, among the largest
reported. We observe measurable polarization within the raining
material, which may be a good magnetic diagnostic of
chromospheric-like material higher in the corona within condensating
loops. |
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