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The kinds of electrical-arc cathode spots described in literature are analyzed. Division of spots into two types qualitatively different in nature-explosive spots and thermal spots-is proposed. The observed microsecond oscillations of the brightness of a rapidly moving spot are interpreted in terms of heat accumulation in the cathode and random motion of the spot. The transition of the spot to a thermal region is analyzed and the lifetime of nonstationary thermal spots is shown to be proportional to their size squared.
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A.G. Parfyonov (1985) studied this question.
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