  Largest Solar Neutrino Flare may be soon detectable by Deep Core neutrino
detector immediately and comunicate to satellites or astronauts. Its detection
is the fastest manifestation of a later (tens minutes,hours) dangerous cosmic
shower. The precursor trigger maybe saving satellites and even long flight
astronauts lives. We shall suggest how. Moreover their detection may probe the
inner solar flare acceleration place as well as the neutrino flavor mixing in a
new different parameter windows. We show the updated expected rate and
signature of neutrinos and antineutrinos in largest solar flare for present
tens Megaton Deep Core telescope at tens Gev range. Speculation for additional
Icecube gigaton array signals are also considered.
