This National Science Foundation (NSF) Project Grant award under the Geosciences program (CFDA 47.050) provides $109,432 to Atmospheric & Space Technology Research Associates LLC (doing business as Orion Space Solutions) to characterize whistler-mode wave properties in the plasmasphere-plasmatrough transition regions. The research aims to improve understanding of the combined effects of chorus and hiss waves on the Earth's radiation belt environment, which can impact spacecraft and aviation. The project will construct statistical models of hiss and chorus waves under both "hard" and "soft" plasmapause conditions, providing critical information to radiation belt modelers. This is the first direct investigation of whistler-mode wave characteristics in the often-excluded broad plasmasphere-plasmatrough transition regions, which account for approximately 50% of occurrences. The award period runs from June 2024 to May 2027. No sub-awards are planned under this grant.
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