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Eleanna Asvestari, Mrs. - MSc |
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ReSoLVE Centre of Excellence, University of Oulu, Finland |
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Session 4 - Poster |
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Semi-empirical long-term reconstruction of the heliospheric parameters validated by cosmogenic radionuclide records |
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E. Asvestari (1), I. G. Usoskin (1,2), N. A.
Krivova (3), R. H. Cameron (3), 1:ReSoLVE Centre of Excellence, University of
Oulu, Finland, 2: Sodankylä Geophysical Observatory, University of Oulu, Finland, 3:
Max-Planck-institut für Sonnensystemforschung, Göttingen, Germany |
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We develop a semi-empirical model describing the heliospheric modulation
of galactic cosmic rays in terms of different heliospheric parameters such as the
heliospheric current sheet tilt angle, the open solar magnetic flux and the polarity
of the large scale solar magnetic field. This model is an improvement of a previous
similar model by Alanko-Huotari et al. (2006). The parameters are fitted using the
observations and reconstructions of the heliospheric parameters for the period 1976
- 2013, which includes the latest very weak solar minimum. The modulation potential
is reconstructed since 1610 using this model and different reconstructions of the
open solar magnetic flux and it is used to estimate the production and distribution
of the cosmogenic isotopes 14C and 10Be. These estimates have been compared with
terrestrial archives in ice cores and tree rings. |
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