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A mechanism for the transition between low/hard, high/soft, and steep powerlaw (SPL) spectral states in black hole X-ray binaries is proposed. Thelow/hard state is explained by the development of a magnetically arrestedaccretion disk attributable to the accumulation of a vertical magnetic field ina central bundle. This disk forms powerful jets and consists of thin spiralaccretion streams of a dense optically thick plasma surrounded by hot,magnetized, optically thin corona, which emits most of the energy in hardX-rays. State transition occurs because of the quasi-periodic or randominversion of poloidal magnetic fields in the accretion flow supplied by thesecondary star. The inward advection of the inverted field results in atemporal disappearance of the central bundle caused by the annihilation of theopposed fields and restoration of the optically thick disk in the innermostregion. This disk represents the high/soft state. The SPL state develops at theperiod of intensive field annihilation and precedes the high/soft state. Thecontinuous supply of the inverted field leads to a new low/hard state becauseof the formation of another magnetically arrested disk.

Magnetic inversion as a mechanism for the spectral transition of black hole binaries