  On the basis of neutron monitor data we estimate the energy spectrum,
anisotropy axis direction and pitch-angle distribution of solar energetic
particles during two major ground level enhancements (GLE 59 on 14 July 2000
and GLE 70 on 13 December 2006). For the analysis we use a newly computed
neutron monitor yield function. The method consists of several consecutive
steps: definition of the asymptotic viewing cones of neutron monitor stations
considered for the data analysis by computations of cosmic ray particles
propagation in a model magnetosphere with the MAGNETOCOSMICS code; computation
of the neutron monitor model responses and derivation of the solar energetic
particle characteristics on the basis of inverse problem solution. The
pitch-angle distribution and rigidity spectrum of high-energy protons are
obtained as function of time in the course of ground level enhancements. A
comparison with previously reported results is performed and reasonable
agreement is achieved. A discussion of the obtained results is included as well
their possible application is included.
