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Ground Level Enhancement Data
Increases in the fluxes of solar cosmic rays with proton energies above 500 MeV, which are recorded on Earth, are called
Ground Level Enhancements (GLE) .
GLE event is registered when there are coincidental and statistically significant increases in counting rate of at least
two differently arranged neutron monitors, including at least one neutron monitor near sea level, and a corresponding increase in the proton flux measured by the spacecraft.
Sub-GLE event is registered when there are coincidental and statistically significant increases in the counting rate of at least two differently located
high-altitude neutron monitors and a corresponding increase in the flux of protons measured by a space instrument, but there is no statistically significant increase in the counting rate on neutron monitors near sea level.
Event of anisotropic cosmic ray increase (ACRE) is characterized by a small, 2-5%, increase in the counting rate of a group of polar neutron monitors, arranged in a certain way.
GLE events are quite rare: today only
72 events have been registered, the first - GLE01 - was observed on February 28, 1942, the last GLE72 - September 10, 2017.
The new generation of
GLE International Database has been operating since 2014, which collects and archives data from a worldwide network of neutron monitors regarding GLE events.
The GLE database covers events starting at № 5 (February 23, 1956) and provides a useful tool for analyzing the most intense solar particle events.
More information...
Full list of GLE events
Data on Ground Level Enhancements
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