  In association with a large solar flare on November 7, 2004, the solar
neutron detectors located at Mt. Chacaltaya (5,250m) in Bolivia and Mt. Sierra
Negra (4,600m) in Mexico recorded very interesting events. In order to explain
these events, we have performed a calculation solving the equation of motion of
anti-protons inside the magnetosphere. Based on these results, the Mt.
Chacaltaya event may be explained by the detection of solar neutrons, while the
Mt. Sierra Negra event may be explained by the first detection of very high
energy solar neutron decay protons (SNDPs) around 6 GeV.
