Fukuoka, Japan—Magnetic reconnection is a process that occurs when the magnetic fields of a conductive plasma quickly rearrange and release massive amounts of stored magnetic energy. It is widely thought to be the underlying mechanism behind cosmic events such as solar flares and substorms in Earth's magnetosphere. Now, researchers from Kyushu University have used high-power lasers to recreate and investigate this puzzling physical phenomenon of magnetic reconnection in a controlled environment. Their results indicate that fast magnetic reconnection is governed by the local physics of the reconnection layer and not the properties of the surrounding plasma.
Briefly put, magnetic reconnection involves the splicing and reconnection of magnetic field lines pointing in opposite directions as two plasma flows meet, which causes plasma heating and high-speed plasma outflows. Although scientists have studied magnetic reconnection through space observations and computer simulations, important questions remain unanswered. In particular, it was unclear how strongly the reconnection process depends on the conditions of the plasma flowing into the reconnection region. Understanding this relationship could help explain why magnetic reconnection rates appear to take a 'universal' value.
In the present study, a research team led by Associate Professor Taichi Morita from Kyushu University's Faculty of Engineering Sciences , in collaboration with researchers from Osaka University, employed lasers to produce interacting plasmas and probe their magnetic reconnection processes. The study was published in the journal Physical Review E on September 8, 2026.
