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As part of the HESPERIA Horizon 2020 project, we developed a software packagefor the direct inversion of Ground Level Enhancements (GLEs) based on data ofthe worldwide network of Neutron Monitors (NMs). The new methodology to studythe release processes of relativistic solar energetic particles (SEPs) makesuse of several models, including: the propagation of relativistic SEPs from theSun to the Earth, their transport in the Earth's magnetosphere and atmosphere,as well as the detection of the nucleon component of the secondary cosmic raysby ground based NMs. The combination of these models allows to compute theexpected ground-level NM counting rates caused by a series of instantaneousparticle releases from the Sun. The proton release-time profile at the Sun andthe interplanetary transport conditions are then inferred by fitting NMobservations with modeled NM counting rates. In the paper the used models forthe different processes, the software and first findings with the new softwareare presented.

Assessment of Source and Transport Parameters of Relativistic SEPs Based on Neutron Monitor Data