What is a Ground-Level Enhancement (GLE) in the context of space weather?
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A
An increase in galactic cosmic ray flux detected at Earth's surface during solar minimum
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B
A sudden increase in solar energetic particle flux detected by ground-based neutron monitors
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C
An enhancement in geomagnetic field strength measured at ground-level magnetometers
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D
An increase in ionospheric electron density measured at ground-based ionosondes