Abstract
Strong breathing of the hydrogen coma of comet Halley was observed by the Lyman-α imager of the Japanese interplanetary spacecraft, Suisei. Measurement of the peak-to-peak variation of central brightness yields a preliminary value of 2.2 ±0.1 days for the period. Two outbursts from the active regions on the comet's surface could be the cause of this variation. A shell structure in the hydrogen coma was also detected. The outbursts appear to contribute overwhelmingly to the Lyman-α activity of this comet, at a pre-perihelion heliocentric distance of ∼1.5 AU.
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