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A new mechanism to generate whistler waves in the course of\udcollisionless magnetic reconnection is proposed. It is found that intense\udwhistler emissions occur in association with plasmoid collisions. The key\udprocesses are strong perpendicular heating of the electrons through a\udsecondary magnetic reconnection during plasmoid collision and the subsequent\udcompression of the ambient magnetic field, leading to whistler\udinstability due to the electron temperature anisotropy. The emissions have a\udbursty nature, completing in a short time within the ion timescales, as has\udoften been observed in the Earth's magnetosphere. The whistler waves can\udaccelerate the electrons in the parallel direction, contributing to the\udgeneration of high-energy electrons. The present study suggests that the\udbursty emission of whistler waves could be an indicator of plasmoid\udcollisions and the associated particle energization during collisionless\udmagnetic reconnection

Bursty emission of whistler waves in association with plasmoid collision