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We present results revealing microwave pulsations produced in a model of aflaring twisted solar coronal loop, without any external oscillatory driver.Two types of oscillations are identified: slowly-decaying oscillations with aperiod of about 70-75s and amplitude of about 5-10% seen in loops both with andwithout energetic electrons, and oscillations with period of about 40s andamplitude of a few tens of percent observed only in loops with energeticelectrons for about 100s after onset of fast energy release. We interpret thelonger-period oscillations as the result of a standing kink mode modulating theaverage magnetic field strength in the loop, whilst the short-periodintermittent oscillations associated with energetic electrons are likely to beproduced by fast variations of the electric field which produces energeticelectrons in this scenario. The slowly-decaying oscillations can explain thequasi-periodic pulsations often observed in the flaring corona.

Pulsations of microwave emission from a solar flare in a twisted loop caused by intrinsic MHD oscillations