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The Mikheyev-Smirnov-Wolfenstein (MSW) explanation of the solar neutrinoproblem is currently compatible with three distinct regions of the two-neutrinooscillation parameter space (delta m^2,sin^2 2theta). We focus on the regionwith the lowest value of delta m^2 (~10^{-7} eV^2), which implies significantEarth regeneration effects for low-energy solar neutrinos. We point out thatsuch effects are not only observable as day-night variations of neutrino eventrates in the real-time BOREXINO experiment, but also as seasonal variations inthe radiochemical Gallium Neutrino Observatory (GNO) at Gran Sasso. We presentdetailed calculations of the difference between winter and summer rates in GNO(six months averages) in excess of the trivial seasonal variation due to theEarth orbital eccentricity. We show that, within the low-delta m^2 MSWsolution, the net winter-summer GNO rate difference amounts to 4-6 SNU, with adominant contribution from pp neutrinos. We also give analytical expressionsfor the winter and summer solar exposure functions at the Gran Sasso site

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Testing solar neutrino MSW oscillations at low<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>δ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>through time variations of event rates in GNO and BOREXINO

Testing solar neutrino MSW oscillations at lowδm2through time variations of event rates in GNO and BOREXINO