Calibration of Neutron Monitor Yield Functions with AMS Data on the ISS

Authors: Veronica Bindi (University of Hawaii), Cristina Consolandi (University of Hawaii), Claudio Corti(University of Hawaii NASA GSFC) , Alexandria Holthaus (University of Hawaii), Nikolay Nikonov (University of Hawaii), Siqi Wang (University of Hawaii)

The global Neutron Monitor (NM) network, active since the 1950s, has successfully measured both the long-term variation of Galactic Cosmic Rays (GCRs) due to the 11- and the 22-year solar cycle modulation, and the short-term variations of GCRs. So far, NMs had detected 74 Ground Level Enhancements (GLEs) and 6 sub-GLEs. AMS is a detector measuring charged particles in the energy range of 300 MeV to a few TeV on the International Space Station (ISS) since May 2011. As a space-borne experiment, AMS detects charged primary particles before their interaction with the atmosphere. AMS has provided precise GCR measurements of different nuclei on various time scales. During solar cycle 24, AMS observed multiple events of high energy SEPs. The goal of this work is to use flux spectra from AMS to calibrate NM yield functions (YF) , i.e., the response of NM to the particle flux with a given energy. With an accurate YF, we can use NM count rates to reproduce near-earth flux spectra like that of AMS. The proposed collaboration between AMS and NMs provides us the opportunity to validate and calibrate the NM YFs during GLE events.