  We study electron-neutrino and electron-antineutrino signals from a supernova
with strong magnetic field detected by a 100 kton liquid Ar detector. The
change of neutrino flavors by resonant spin-flavor conversions, matter effects,
and neutrino self-interactions are taken into account. Different neutrino
signals, characterized by neutronization burst event and the total event
numbers of electron-neutrinos and electron-antineutrinos, are expected with
different neutrino oscillation parameters and neutrino magnetic moment.
Observations of supernova neutrino signals by a 100 kton liquid Ar detector
would constrain oscillation parameters as well as neutrino magnetic moment in
either normal and inverted mass hierarchies.
