Bibcode
del Toro Iniesta, J. C.; Collados, M.; Sanchez Almeida, J.; Martinez Pillet, V.; Ruiz Cobo, B.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 570-576. Research supported by CICYT.
Advertised on:
7
1990
Citations
11
Refereed citations
9
Description
The usually assumed identification of small-scale magnetic
concentrations with bright facular or network points on the photosphere
is observationally checked by using high spatial resolution spectra of
Ca II K bright points very near the disk center. The detection of
spatially unresolved magnetic structures is made via a new differential
analysis of the well-known pair of Fe I lines 5247.06 A and 5250.22 A;
these concentrations are present in the central part of a line weakening
zone, which is of some 2 arcsec wide. No continuum intensity enhancement
with respect to the quiet photosphere can be ascertained of these
structures, within an accuracy threshold of 1.2 percent. In spite of
this, magnetic concentrations brighter than the quiet photosphere are
compatible with the observations, but if so, they must be narrower than
0.2 arcsec.