$\phi _{\boldsymbol ES}$ ( ${{\boldsymbol p}}{{\boldsymbol e}}{{\boldsymbol p}}$ )
INSPIRE search
${{\mathit p}}{{\mathit e}}{{\mathit p}}$ solar-neutrino flux measured via ${{\mathit \nu}_{{e}}}$ elastic scattering. This process is sensitive to all active neutrino flavors, but with reduced sensitivity to ${{\mathit \nu}_{{\mu}}}$, ${{\mathit \nu}_{{\tau}}}$ due to the cross section difference, $\sigma ({{\mathit \nu}}_{{{\mathit \mu}},{{\mathit \tau}}}{{\mathit e}}$) $\sim{}$ 0.2 ${\mathit \sigma (}$ ${{\mathit \nu}_{{e}}}{{\mathit e}}{)}$. If the ${{\mathit p}}{{\mathit e}}{{\mathit p}}$ solar-neutrino flux involves non-electron flavor active neutrinos, their contribution to the flux is $\sim{}$ 0.2 times that of ${{\mathit \nu}_{{e}}}$.
