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Global magnetic fields of flare stars can evolve rapidly, in time scale ofhundreds or dozens of days. We believe, that such changes result from rapidsuperposition of local magnetic fields generated by differential rotation ofthose stars. We discuss possible mechanisms of generation and dissipation oflocal and global magnetic fields in sample flare stars OT Ser and YZ CMi. Wepropose mechanism of magnetic braking of these stars, in which differentialrotation generates local magnetic fields, and eventually energy accumulated inlocal fields is radiated away by flares. We obtained estimates of therotational energy and the energy of the global magnetic field of OT Ser and YZCMi. We also show that the energy of the local magnetic fields dissipatedduring superflare of YZ CMi on 9 February 2008 (UT 20:22:00) did not influencethe global magnetic field of this star.

On the global and local magnetic fields in flare stars. Study of YZ CMi and OT Ser