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Author(s): Si-Bo Xu, Jia-Ji Sun, Shan Wang, Jing-Huan Li, Xu-Zhi Zhou, Daniel B. Graham, Yu-Fei Hao, Qiu-Gang Zong, Chao Yue, Yoshiharu Omura, and Yuri V. Khotyaintsev Studies have long suggested that shocks can undergo cyclical self-reformation as a type of shock nonstationarity. Until now, providing solid evidence for shock reformation in spacecraft observation and identifying its generating mechanisms remain challenging. In this Letter, by...

Author(s): Tiannan Wu and Shaojie Wang Global gyrokinetic simulation of the ion temperature gradient mode shows that the radial electric field, ${E}_{r}$ well, upshifts the critical temperature gradient near the magnetic axis, in the weak but not in the strong magnetic shear ($s$) configuration. The geometric curvature effect almost canc… [Phys. Rev. Lett. 136, 015102] Published Mon Jan 05, 2026

Author(s): T. Jitsuk, M. J. Pueschel, P. W. Terry, and A. Di Siena Interactions between MHD-scale tearing modes (TMs) and ion-gyroradius-scale trapped-electron modes (TEMs) in a fusion plasma are simulated with global gyrokinetics, using a consistent set of fixed equilibrium profiles. Unstable core TMs nonlinearly couple and transfer energy to smaller-scale stable … [Phys. Rev. Lett. 136, 015101] Published Fri Jan 02, 2026

Author(s): Wenxiang Hu, Gabriel Aeppli, Christopher Arrell, Marco Calvi, Sergio Carbajo, Andreas Dax, Yunpei Deng, Philipp Dijkstal, David Dunning, Simon Gerber, Martin Huppert, Stefan Neppl, Sven Reiche, Thomas Schietinger, Neil Thompson, Alexandre Trisorio, Carlo Vicario, Alexander Zholents, and Eduard Prat Mode locking—a laser technique that revolutionized optical physics—has been extended to x rays, producing stable trains of attosecond pulses...

Author(s): X. D. Du, W. W. Heidbrink, Z. Yan, P. H. Diamond, G. R. McKee, L. Schmitz, M. A. Van Zeeland, H. Q. Wang, M. E. Austin, L. Liu, K. J. Callahan, and N. Shi Mitigation and suppression of low-$k$ turbulence are observed during the nonlinear evolution of toroidicity-induced Alfvén eigenmodes (TAEs) in DIII-D experiments. Turbulence mitigation begins when the dominant TAE starts to depart from the typical shear Alfvén wave polarization....

Author(s): Dominic Bernardi, Yajie Yuan, and Alexander Y. Chen Fast magnetosonic waves are one of the two low-frequency plasma modes that can exist in a neutron star magnetosphere. It was recently realized that these waves may become nonlinear within the magnetosphere and steepen into some of the strongest shocks in the universe. These shocks, when in the appro… [Phys. Rev. Lett. 135, 265201] Published Mon Dec 22, 2025

Author(s): David N. Hosking, Ian G. Abel, and Steven C. Cowley We present a solvable scenario for 3D reconnection in a sheared magnetic field. We consider a localized external force that is applied slowly to a flux tube and then maintained, generating an Alfvénic perturbation that spreads along the field lines. Separation of the sheared field lines reduces the … [Phys. Rev. Lett. 135, 255101] Published Thu Dec 18, 2025