Neutrino detection in super kamiokande

[plasmon]

In Superkamiokande, How does one differentiate between muon being produced by neutrinos coming from upward than the muon being produced by the neutrinos coming from downward.

http://hep.bu.edu/~superk/atmnu/

 

[Bill_K]

From Wikipedia:

"The Cherenkov light is projected as a ring on the wall of the detector and recorded by the PMTs. Using the timing and charge information recorded by each PMT, the interaction vertex, ring direction and flavor of the incoming neutrino is determined."

Sounds like they can directly observe the direction of the incoming particle.