T-violation search with very long baseline neutrino oscillation experiments

We consider possibilities of observing T-violation effects in neutrino oscillation experiments with a very long baseline (similar to 10000 km) using a low energy neutrino (similar to several hundreds MeV). We show that the matter effect effectively changes only the first-second generation mixing angle, respecting solar neutrino deficits and atmospheric neutrino anomalies. The effective mixing of the first-second generation in the Earth grows up to maximum by resonance. This effect enables one to search T-violation in case the first-second mixing angle is small. We discuss its implications to the observations of T-violation effects in long baseline experiments.