| Issue |
A&A
Volume 382, Number 1, JanuaryIV 2002
|
|
|---|---|---|
| Page(s) | 312 - 318 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361:20011582 | |
| Published online | 15 January 2002 | |
Center-to-limb-variation of the G-band lines at 430.5 nm
Kiepenheuer–Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany
Corresponding author: K. Langhans, kai@kis.uni-freiburg.de
Received:
10
September
2001
Accepted:
8
November
2001
We measure the center-to-limb-variation of the CH lines in the
wavelength range from 430.40 to 430.61 nm (G-band) for both quiet sun
and for the cooler atmophere of sunspot umbrae at different heliographic
positions. The limb effect of the CH lines is about 650 ms-1 at
with
a slope similar to weak Fe lines. We investigate the behaviour of the CH
abundance in the range of optical depth (
to 
)
that is accessible by center-to-limb observations. The CH abundance
decreases with height in accordance with recent numerical models.
Key words: Sun: atmosphere, photosphere
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.