Solar meridional plasma motions from 1982 until 1986

Details Solar meridional plasma motions from 1982 until 1986 Solar meridional plasma motions from 1982 until 1986

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..224l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 224-227.

Astronomy and Astrophysics

Astrophysics

15

Magnetohydrodynamic Flow, Meridional Flow, Photosphere, Solar Rotation, Solar Spectra, Iodine, Line Spectra, Solar Cycles, Solar Magnetic Field

Scientific paper

The directions and velocities of meridional plasma motions are investigated using Doppler shifts of the magnetically nonsplit line Fe 557.6-nm. Possible drifts of the spectrograph were controlled by measuring nearby iodine lines from a laboratory source. The scattered light was kept low by using the Capri coude refractor mainly around local noon. There is a general scatter of about + or - 20-50 m/sec in the yearly mean results. The scatter is up to -200 m/sec 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 + or - 10 m/sec.

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