The wings of Ca II H and K as solar fluxtube diagnostics

Details The wings of Ca II H and K as solar fluxtube diagnostics The wings of Ca II H and K as solar fluxtube diagnostics

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437.1069s&link_type=abstract

Astronomy and Astrophysics, Volume 437, Issue 3, July III 2005, pp.1069-1080

Astronomy and Astrophysics

Astrophysics

10

Sun: Photosphere, Sun: Magnetic Fields, Sun: Faculae, Plages

Scientific paper

We combine high-resolution Ca II H and K spectrograms from the Swedish Vacuum Solar Telescope with standard fluxtube modeling to derive photospheric temperature and velocity stratifications within individual magnetic elements in plage near a sunspot. We find that 1D on-axis modeling gives better consistency than spatial averaging over flaring-fluxtube geometry. Our best-fit temperature stratifications suggest that magnetic elements are close to radiative equilibrium throughout their photospheres. Their brightness excess throughout the H and K wings compared with the quiet photosphere is primarily due to low density, not to mechanical heating. We conclude that the extended H and K wings provide excellent fine-structure diagnostics for both high-resolution observations and simulations of the solar photosphere.

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