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This is a Quantitative Study study.

October 5, 2025Open Access

Do plasmoids induce fast magnetic reconnection in well-resolved current sheets in 2D MHD simulations?

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Analysis reveals that plasmoids do not enhance reconnection in current sheets, suggesting resistance dependence at high Lundquist numbers.

Plasmoids do not create a rapid cascade, which contrasts with prior beliefs about fast reconnection.
Analysis shows reconnection rates follow Sweet-Parker scaling at lower Lundquist numbers, indicating resistance dependence.
Enhanced reconnection rates observed with plasmoid formation shift scaling beyond Lundquist number 10^4.
Results challenge existing theories, necessitating a reevaluation of plasmoid roles in magnetic reconnection dynamics.

Vicentin et al. (2025) studied this question.

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Analysis reveals that plasmoids do not enhance reconnection in current sheets, suggesting resistance dependence at high Lundquist numbers.