Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.5106b&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #51.06; Bulletin of the American Astronomical Society, Vol. 24, p.814
Astronomy and Astrophysics
Astronomy
2
Scientific paper
A new sequence of regular observations has been initiated at Stanford's Wilcox Solar Observatory to better measure the projected component of the photospheric magnetic fields poleward of about 75deg latitude. The measurements are made in the 5250 Angstroms Fe I line used for both the regular Stanford magnetograms and meanfield measurements, in a circular aperture of 2 arc min projected diameter centred on the visible pole and on both the limb points closest to the poles. Initial results of observations since the beginning of the year suggest that the fields measured each day vary between +/- 1.5 gauss at this point in the cycle, with individual measurement uncertainties of approximately 0.15 gauss. These results are compared with the existing sequence of polar-field measurements, based on the daily magnetograms and covering a 30deg latitude range, that extend back to 1976. There is a suggestion of a rotational modulation of the signal in the limited dataset obtained so far.
Bogart Richard. S.
Hoeksema Jon Todd
Scherrer Philip H.
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