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Astron. Astrophys. 348, 993-999 (1999)

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A dynamic solar core model: on the activity-related changes of the neutrino fluxes

Attila Grandpierre

Konkoly Observatory, P.O. Box 67, H-1525 Budapest, Hungary (grandp@ogyalla.konkoly.hu)

Received 8 October 1998 / Accepted 19 April 1999

Abstract

I point out that the energy sources of the Sun may actually involve runaway nuclear reactions as well, developed by the fundamental thermonuclear instability present in stellar energy producing regions. In this paper I consider the conjectures of the derived model for the solar neutrino fluxes in case of a solar core allowed to vary in relation to the surface activity cycle. The observed neutrino flux data suggest a solar core possibly varying in time. In the dynamic solar model the solar core involves a " quasi-static" energy source produced by the quiet core with a lower than standard temperature which may vary in time. Moreover, the solar core involves another, dynamic energy source, which also changes in time. The sum of the two different energy sources may produce quasi-constant flux in the SuperKamiokande because it is sensitive to neutral currents, anti-neutrinos (and axions), therefore it observes the sum of the neutrino flux of two sources which together produce the solar luminosity. A dynamic solar core model is developed to calculate the contributions of the runaway source to the individual neutrino detectors. The results of the dynamic solar core model suggest that since the HOMESTAKE detects mostly the high energy electron neutrinos, therefore the HOMESTAKE data may anticorrelate with the activity cycle. Activity correlated changes are expected to be present only marginally in the GALLEX and GNO data. The gallium detectors are sensitive mostly to the pp neutrinos, and the changes of the pp neutrinos arising from the SSM-like core is mostly compensated by the high-energy electron neutrinos produced by the hot bubbles of the dynamic energy source. The dynamic solar model suggests that the GALLEX data may show an anti-correlation, while the SuperKamiokande data may show a correlation with the activity cycle. Predictions of the dynamic solar model are presented for the SNO and Borexino experiments which can distinguish between the effects of the MSW mechanism and the consequences of the dynamic solar model. The results of the dynamic solar model are consistent with the present helioseismic measurements and can be checked with future helioseismic measurements as well. In the Appendix, the physical parameters of the bubbles are derived, including their temperatures, energy contents, sizes, velocities, lifetimes, and the possible lengths of path they can travel in the Sun.

Key words: nuclear reactions, nucleosynthesis, abundances – Sun: activity – elementary particles – stars: interiors

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 1999

Online publication: August 13, 199
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