CR Ground Level Enhancements spectra (IGLED)

Continuous measurements of ground-based neutron monitors (NMs) form the main data source to study high-energy/high-intensity solar energetic particle (SEP) events, called ground-level enhancements (GLEs). All available data are collected in the International GLE Database (IGLED, gle.oulu.fi), which provides formal NM count-rate increases above the constant pre-increase level due to galactic cosmic rays (GCR). This dataset is used to reconstruct energy spectra of GLE events.

However, the assumption of the constant GCR background level throughout GLE events is often invalid. Here we made a major revision of the IGLED dataset and provided a dataset of detrended NM count-rate increases accounting for the variable GCR background. The formal GLE count-rate increases were corrected for the variable GCR background which may vary significantly during GLE events.