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© 2014 The Aerospace Corporation
Responsive Environmental Assessment, Commercial Hosting Demonstration (REACH)
Theme #3 Contribution: Particle Precipitation
J. Mazur
The Aerospace Corporation
Space Science Applications Laboratory
571-307-3915
24 September 2014
2
REACH Project Summary
• Project team: SMC, Aerospace, Harris Corp., JHU/APL
• Commercial hosting of micro-dosimeters on Iridium-NEXT (780 km polar orbit, 6 local time planes)
• 18 dual-dosimeter payloads delivered with options for additional units
• Different energy thresholds set by windows of varying thickness
• First launch: mid 2015
• Last launch: late 2017
• Operations through 2030
4.8x3.4x0.8 in592 g0.9 W
Dosimeter pod 6 pods in thermal test
Hosting location
3
New Opportunity
• Dose rates measured at a resolution of 100 milliseconds and broadcast from all vehicles at all times
• Response functions allow for inversion of particle energy spectra
– Protons ~12 to 57 MeV
– Electrons ~0.5 to 5 MeV
• Global views of near-real-time particle precipitation of interest space weather and operations centers
• Primary science applications:– Electron microbursts
– Solar particle cutoffs
• Will be operating during the extended mission
Global view of trapped and precipitating particles
Proton response functions (similar to REACH)