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We present examples of the both types of bursts and show their similaritiesand differences. Then for chains of type I bursts a similar model as fordrifting pulsation structures (DPSs) is proposed. We show that similarly as inthe DPS, the chains of type I bursts can be generated by the fragmentedmagnetic reconnection associated with plasmoids interactions. To support thisnew model of chains of type I bursts, we present an effect of merging of twoplasmoids to one larger plasmoid on the radio spectrum of DPS. This process canalso explain the "wavy" appearance of some chains of type I bursts. Then weshow that the chains of type I bursts with the "wavy" appearance can be usedfor estimation of the magnetic field strength in their sources. We think thatdifferences of chains of type I bursts and DPSs are mainly owing to differentregimes of the magnetic field reconnection. While in the case of chains of typeI bursts the magnetic reconnection and plasmoid interactions are in thequasi-separatrix layer of the active region in more or less quasi-saturatedregime, in the case of DPSs, observed in the impulsive phase of eruptiveflares, the magnetic reconnection and plasmoids interactions are in the currentsheet formed under the flare magnetic rope, which moves upwards and forces thismagnetic reconnection.

Are chains of type I radio bursts generated by similar processes as drifting pulsation structures observed during solar flares?