Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.185101
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Funding
- National Science Foundation (NSF) Geospace Environment Modeling Grant [1405166]
- NASA [NNX16AF75G, NNX16AG76G, NNX14AL38G]
- Centre national de la recherche scientifique (CNRS)
- Centre national d'etudes spatiales (CNES)
- NASA [904779, NNX16AG76G, 905607, NNX16AF75G, NNX14AL38G, 679754] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1405166] Funding Source: National Science Foundation
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Supported by a kinetic simulation, we derive an exclusion energy parameter EX providing a lower kinetic energy bound for an electron to cross from one inflow region to the other during magnetic reconnection. As by a Maxwell demon, only high-energy electrons are permitted to cross the inner reconnection region, setting the electron distribution function observed along the low-density side separatrix during asymmetric reconnection. The analytic model accounts for the two distinct flavors of crescent-shaped electron distributions observed by spacecraft in a thin boundary layer along the low-density separatrix.
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