[longshadow]

As an aside, do you know if, when the Solar neutrino problem was resolved, it was resolved in favor of the "flavor-change-takes-place-in-space" theory or the "MSW - flavor-changes-when-it-passes-thru-matter" theory?

[Physicist]

There's definitely an MSW effect going on. They have extracted the MSW parameters from the charged-current and neutral-current measurements. Furthermore, as a check they have measured the day-night asymmetry, which arises from the fact that at night, the solar neutrinos have to pass through the bulk of the Earth.