Strong breathing of the hydrogen coma of comet Halley
Strong breathing of the hydrogen coma of comet Halley
复制标题
哈雷彗星氢彗发的强烈呼吸
作者：
E. Kaneda;K. Hirao;M. Takagi;O. Ashihara;T. Itoh;M. Shimizu
日本行星际航天器“水成号”的莱曼-α成像仪观测到哈雷彗星氢彗发的强烈呼吸。对中心亮度的峰-峰变化的测量得出了该周期的初步值为2.2 ±0.1天。彗星表面活跃区域的两次爆发可能是造成这种变化的原因。还检测到氢彗发中的壳结构。爆发似乎对这颗彗星的莱曼-α活动有着压倒性的贡献，在近日点前的日心距离为1.5 Au。
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.