Nonpotentiality of Chromospheric Fibrils in NOAA Active Regions 11092 and 9661

Details Nonpotentiality of Chromospheric Fibrils in NOAA Active Regions 11092 and 9661 Nonpotentiality of Chromospheric Fibrils in NOAA Active Regions 11092 and 9661

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...739...67j&link_type=abstract

The Astrophysical Journal, Volume 739, Issue 2, article id. 67 (2011).

Astronomy and Astrophysics

Astronomy

1

Magnetic Fields, Sun: Chromosphere

Scientific paper

In this paper, we present a method to automatically segment chromospheric fibrils from Hα observations and further identify their orientation. We assume that chromospheric fibrils are aligned with the magnetic field. By comparing the orientation of the fibrils with the azimuth of the embedding chromospheric magnetic field extrapolated from a potential field model, the shear angle, a measure of nonpotentiality, along the fibrils is readily deduced. Following this approach, we make a quantitative assessment of the nonpotentiality of fibrils in two NOAA active regions (ARs): (1) the relatively simple AR 11092, observed with very high resolution by Interferometric Bidimensional Spectrometer, and (2) a β-γ-δ AR 9661, observed with median resolution by Big Bear Solar Observatory before and after an X1.6 flare.

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