Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.225005
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Funding
- NASA
- [NNX07AF64G]
- [NNX07AF54G]
- [NNX12AI20G]
- [ATM0802380]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1153817] Funding Source: National Science Foundation
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Spatially resolved, diagnostic signatures across the X-line and electron-diffusion region (EDR) by the Polar spacecraft are reported at Earth's magnetopause. The X-line traversal has a local electron's skin depth scale. First, resolved EDR profiles are presented with peak electron thermal Mach numbers >1: 5, anisotropy >7, calibrated electron agyrotropy >1, and misordered expansion parameters indicative of demagnetization and strong (150 eV) increases in electron temperature. The amplitude and phase of these profiles correlate well with a guide geometry kinetic simulation of collisionless magnetic reconnection. Such high resolution diagnosis has been made possible by data processing techniques that afford an 11-fold reduction in the aliasing time for the electron moments.
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