Cyclic Variation of the High-Energy Solar Neutrino Flux

Yu. R. Rivin and V. N. Obridko

Institute of Terrestrial Magnetism, Aeronomy, and Radio-Wave Propogation, Russian Academy of Sciences,
Troitsk, Moscow oblast, 142092 Russia

Received February 28, 1996

Abstract—The problem of the cyclic variation of the flux of high-energy neutrinos from the Sun measured by
the Homestake Gold Mine detector is analyzed. The increase in the signal-to-noise ratio for yearly averaged
values compared to the original data for individual measurement runs is demonstrated. The variations in the
yearly averaged neutrino fluxes agree well with variations of components of the global solar magnetic field over
the last two 11-year cycles, indicating that the neutrino fluxes vary in time and revealing their complex fre-
quency composition. It is suggested that the 11-year neutrino flux cycle is associated with an amplitude modu-
lation cycle of the powerful local solar magnetic field. The neutrino cycle lags the variations of the latitudinal
magnetic field modulus by ~7–8 months, and lags the Wolf number cycle by approximately a year. The quasi-
two-year variations of the neutrino flux have somewhat different properties and are probably generated by
another mechanism: thermal processes near the center of the solar core.

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