Issue |
A&A
Volume 438, Number 3, August II 2005
|
|
---|---|---|
Page(s) | 1059 - 1065 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20052789 | |
Published online | 18 July 2005 |
Solar limb faculae
1
Institut für Physik, IGAM, Universitätsplatz 5, 8010 Graz, Austria e-mail: jkh@igam.uni-graz.at
2
Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany e-mail: ewiehr@uni-sw.gwdg.de
Received:
31
January
2005
Accepted:
22
March
2005
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 continuum
up to only
from the limb (
). 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.
Key words: Sun: photosphere / Sun: faculae, plages
© ESO, 2005
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