ИСТИНА

Magnetic reconnection is a fundamental process in a magnetized plasma for changing the magnetic connectivity of plasma elements and for converting magnetic energy to plasma kinetic energy, heat and fast-particle energy. In Sun’s atmosphere it is thought toplay a key role in producing solar flares. Here we numerically with a help of 3D- MHD code study the nonlinear evolution of magnetic field reconnection in 3D plasma configuration in the neighborhood of a critical point and influence of magnetic recon- nection on magnetic helicity distribution. The special attention is devoted to the case of structurally unstable magnetic field. The transformation of structurally unstable mag- netic configurations in structurally stable ones is studied numerically and analytically in the frame of Morse theory.