Solar limb faculae

Details Solar limb faculae Solar limb faculae

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...438.1059h&link_type=abstract

Astronomy and Astrophysics, Volume 438, Issue 3, August II 2005, pp.1059-1065

Astronomy and Astrophysics

Astrophysics

19

Sun: Photosphere, Sun: Faculae, Plages

Scientific paper

We observe solar limb faculae at an unprecedented spatial resolution with the new 1 m Swedish Solar Telescope SST on La Palma. Speckle-reconstructed images are used to study 4475 limb facular grains simultaneously in the 430 nm G-band and the 587.5±1.5 continuum up to only 1'' from the limb (cos θ=0.05). No systematic contrast decrease is found even a few arcsec from the solar limb. The facular grains appear to be “projected” on the limb-side neighboring granules; approaching the disc center, the corresponding features occur as inter-granular G-band bright points. Independently, we took spectra with the French-Italian THEMIS telescope on Tenerife and find that the known “line-gap effect” from disc center disappears near the limb. Here, the facular continuum is enhanced whereas the normalized profiles are unchanged with respect to the undisturbed neighborhood.

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