Title: Global Magnetic Field of the Sun and Long-term Variations of Galactic Cosmic Rays
Author: V.N.Obridko
Affil: Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences
Email: solter@izmiran.troitsk.ru
Authors: A.V.Belov, B.D.Shelting, R.T.Gushchina, A.F.Kharshiladze, and V.G.Yanke
Affils: same as above
Abstract: The paper deals with the relation of long-term variations of galactic cosmic rays (GCR) to the global solar magnetic field (GMF), solar wind parameters and climate change. The tilt of the heliospheric current sheet (HCS) and other solar-heliospheric parameters are successfully used to describe long-term variations of cosmic rays (CR) in the solar cycles. The peculiarity of the present work is the use of the HCS tilt and other parameters reconstructed from Ha observations of filaments for the period when direct GMF observations were unavailable. Thus, we could extend the GCR simulation interval back to 1953. The analysis of data for 1953-1999 revealed a good correlation (the correlation coefficient >0.90) between the solar-heliospheric parameters and GCR in different cycles of solar activity. Besides, the approach applied makes it possible to describe the behavior of cosmic rays in the epochs of solar maxima, which could not be done before. This indicates both the adequacy of the model and reliability of the reconstructed GMF parameters.
We propose to modify this model and apply it to reconstruct the behavior of cosmic rays in the Earth's environment for the past 85 years using the well-known and new indices of solar activity. Thus obtained retrospective data on GCR variations are compared with isotopic data and long-term variations in the climate characteristics. A possible role of cosmic ray variations in the global warming on the Earth is discussed.