On the relation between penumbral intensity and flow filaments

Details On the relation between penumbral intensity and flow filaments On the relation between penumbral intensity and flow filaments

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326..301s&link_type=abstract

Astronomische Nachrichten, Vol.326, Issue 3, p.301-304

Astronomy and Astrophysics

Astronomy

19

Sun

Scientific paper

Taking advantage of high spatial (≈ 0.5 arcsec) and high spectral (λ/δλ = 250 000) resolution observations obtained with the 2D spectrometer TESOS, we analyze a sunspot located at a heliocentric angle of 23o. We elaborate on the issue of a correlation between dark filaments and the Evershed flow in sunspot penumbrae. Controversies on the existence of such a correlation are resolved: It varies from the inner to the outer penumbra, from the center-side to the limb-side penumbra, and depends on the length of the trace which is used to perform the correlation. The flow map exhibits flow filaments in the center-side penumbra while the red-shifted limb-side penumbra does not show filamentary fine-structure. High correlation coefficients, |C| ≈ 0.9 are only found if small scales, i.e. short traces cutting individual features are considered. C is positive in the inner center and limb-side penumbra, and tends to be negative in the outer penumbra. Our results imply that the Evershed flow is present in bright and dark filaments. In individual cases we find that bright and dark intensities are connected by a flow filament supporting the moving tube model for the penumbral fine structure.

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