Spectroheliograms and motions of magnetic tracers

Details Spectroheliograms and motions of magnetic tracers Spectroheliograms and motions of magnetic tracers

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..577m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 577-582. Research supported by CNRS.

Astronomy and Astrophysics

Astrophysics

9

Dynamo Theory, Solar Cycles, Solar Limb, Spectroheliographs, Data Processing, Faculae, Solar Magnetic Field, Spatial Resolution, Tracers

Scientific paper

The series of spectroheliograms of the Paris-Meudon Observatory, starting in 1919, is a powerful tool for studies of the solar cycle and the solar dynamo. This paper describes a method of data processing which corrects most of the predictable distortions by the use of Fourier expansions of the shape of the limb. The drifts of magnetic tracers (spots and faculae in the case of K1v spectroheliograms) are computed automatically. The accuracy is checked by some comparisons with results published by the Debrecen Observatory. In most cases, the departures are 0.1 or 0.2 heliographic degree, and comparable to the spatial resolution of the spectroheliograms.

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