1. Department of Climate and Space Sciences and EngineeringUniversity of Michigan Ann Arbor Michigan USA
2. Space Sciences LaboratoryUniversity of California Berkeley California USA
3. Department of Astrophysical Sciences and Princeton Plasma Physics LaboratoryPrinceton University Princeton New Jersey USA
4. Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana‐Champaign Urbana‐Champaign Illinois USA