Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170...41l&link_type=abstract
Astrophysics and Space Science, Volume 170, Issue 1-2, pp. 41-41
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The directions and velocities of meridional plasma motions are investigated using Doppler shifts of the magnetically non-split line Fe 557.6 nm. Possible drifts of the spectrograph were controlled by measuring nearly iodine lines from a laboratory source. The scattered light was kept low by using the Capri Coudé refractor mainly around local noon. There is a general scatter of about ±20 to ±50 m s-1 in the yearly mean results. The scatter is up to -200 m s-1 for the year 1985. The results are compared with published data. Although some systematic meridional plasma motions could be detected from the average of the meridional flows within the whole observing period 1982 until 1986, the final analysis suggests, that all meridional motions averaged over half a solar cycle are below ±10 m s-1.
Lustig G.
Wöhl Hubertus
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