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Pulses from 16 previously known rotating radio transients (RRAT) have beensearched at the 110 MHz daily monitor program for 4 to 5.5 years by using theLarge-Phased-Array (LPA) at Pushchino. The total number of pulses detected insuch a long observation interval is only 90 pulses for RRAT J0640+07 or is ashigh as 10,751 pulses for RRAT J0302+22. The number and amplitude of pulsesvaries at a time-scales from six to twenty months for RRATs J1336+33, J1404+11,J1848+15, J2051+12, J2105+22, and the pulse number can increase by one or twoorders of magnitude in active phases. The long-term trends are found for RRATsJ0139+33 and J0302+22, showing a 2-3 times increase in detected pulse numberover 1,959 days. Some RRATs show the annual variations on both pulse number andpulse amplitude. It is hard to explain all these variation time scales byrefractive scintillation on the interstellar medium. The annual and semi-annualvariations are likely caused by scintillations of the inhomogeneousinterplanetary plasma. Our data show that the number of observational sessionswith no pulse detection over the threshold decreases exponentially with thelength of pulse silence.

Pushchino multibeam pulsar search -- II. Long-term variability of RRATs