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

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

Publishing date

May 2011

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1738j&link_type=abstract

Journals

American Astronomical Society, SPD meeting #42, #17.38; Bulletin of the American Astronomical Society, Vol. 43, 2011

Science

Astronomy and Astrophysics

Field

Astronomy

Type

Scientific paper

Abstract

We have developed a method to automatically segment chromospheric fibrils from Halpha observations and further identify their orientation. We assume that chromospheric fibrils are magnetic field-aligned. By comparing the orientation of the fibrils with the azimuth of the embedding chromospheric magnetic field extrapolated from the photosphere or chromosphere with the help of 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 the active region NOAA 9661 and NOAA 11092. The spatial distribution and the histogram of the shear angle along fibrils are presented.

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