The Observed Red Asymmetry in the Bisectors of the Chromospheric CaII 854.2 nm Line

Details The Observed Red Asymmetry in the Bisectors of the Chromospheric CaII 854.2 nm Line The Observed Red Asymmetry in the Bisectors of the Chromospheric CaII 854.2 nm Line

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0304b&link_type=abstract

American Astronomical Society, SPD meeting #42, #3.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The bisector analysis of chromospheric spatially and temporally unresolved Ca II atlas profiles reveals a red asymmetry of the Doppler core in form of an "inverse C” (Uitenbroek, 2005). The origin of this red asymmetry is yet unknown. We use spatially and temporally resolved 2D spectroscopic chromospheric (CaII 854.2 nm) observations of the quiet and more active sun obtained with the Dunn Solar Telescope's Interferometric BIdimensional Spectrometer (IBIS) to determine where the inverse C-shape appears with respect to granules, inter-granular lanes, and magnetic features. To this end we generate masks of the spatial location of the red asymmetry. We also examine the temporal behavior of profiles showing this red asymmetry. In the chromosphere, we find the red asymmetry most concentrated in dark region outside of magnetic networks; it avoids nearly all bright regions. It disappears almost entirely within magnetic networks which suggests magnetic activity "damps out” the red asymmetry. Relative to the underlying photosphere, the red asymmetry preferentially occurs over or just slightly offset from inter-granular lanes; very rarely does it occur over granules. The temporal behavior of at least one red asymmetry profile shows a periodicity near 3 min. We speculate that the red asymmetry forms from upward traveling acoustic shock waves.
This work was supported by the National Solar Observatory's Research Experiences for Undergraduate (REU) program which is co-funded by the Department of Defense in partnership with the National Science foundation REU Program.

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