PIC simulations show E·B ≠ 0 regions reduce magnetic helicity in sub-ion turbulence, and a new history-dependent helicity density produces time-independent intermediate-scale plateaus consistent with cancellation-dominated 2D decay.
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MMS observations reveal a knotted, non-coplanar electron diffusion region in Earth's magnetotail reconnection where the EDR plane deviates 38 degrees from the IDR, the guide field rotates and strengthens, and Hall magnetic fields differ in structure between electron and ion scales.
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Kinetic Route to Helicity-Constrained Decay
PIC simulations show E·B ≠ 0 regions reduce magnetic helicity in sub-ion turbulence, and a new history-dependent helicity density produces time-independent intermediate-scale plateaus consistent with cancellation-dominated 2D decay.
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Observation of a Knotted Electron Diffusion Region in Earth's Magnetotail Reconnection
MMS observations reveal a knotted, non-coplanar electron diffusion region in Earth's magnetotail reconnection where the EDR plane deviates 38 degrees from the IDR, the guide field rotates and strengthens, and Hall magnetic fields differ in structure between electron and ion scales.