1. © 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 joseph.mazur@aero.org 571-307-3915 24 September 2014

2. 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 in 592 g 0.9 W Dosimeter pod 6 pods in thermal test Hosting location

3. 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)

4. © 2014 The Aerospace Corporation