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Published online by Cambridge University Press: 14 March 2005
The reconstructions of the open solar magnetic field since 1844 (with use of geomagnetic data) and since 1915 (with use of H$\alpha$-spectroheliograms) are obtained and comparedThe full version of this paper can be found at http://www.gao.spb.ru/personal/ivanov/papers/iv-mil-iaus2004.pdf..To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html