用SOHO航天器上的SWAN仪器观测103 P/Hartley 2彗星的产水
Water Production by Comet 103P/Hartley 2 Observed with the SWAN Instrument on the SOHO Spacecraft
摘要：
2010年9月14日至12月12日，SOHO航天器上的SWAN（太阳风各向异性）全天空相机通过103 P/哈特利2号彗星周围的莱曼-α氢排放确定了全球水的产生率。这段时间包括11月4日EPOXI飞船的飞越。水的产量比1997年的幽灵低3倍，也是由天鹅测量的。在2010年9月30日的一天内，它增加了约2.5倍，11月24日至30日之间也有类似的相应下降。在近日点的{ \pm }20天内，升华水的总表面积约为0.5 km^2，约为原子核平均截面的一半。在此期间之外，它约为0.2平方公里。峰值为90%，这意味着释放的核冰碎片产生了显著的水。
英文摘要：
Global water production rates were determined from the Lyman-α emission of hydrogen around comet 103P/Hartley 2, observed with the SWAN (Solar Wind ANisotropies) all-sky camera on the SOHO spacecraft from September 14 through December 12, 2010. This time period included the November 4 flyby by the EPOXI spacecraft. Water production was 3 times lower than during the 1997 apparition also measured by SWAN. In 2010 it increased by a factor of ~2.5 within one day on September 30 with a similar corresponding drop between November 24 and 30. The total surface area of sublimating water within {\pm}20 days of perihelion was ~0.5 km^2, about half of the mean cross section of the nucleus. Outside this period it was ~0.2 km^2. The peak value was 90%, implying a significant water production by released nucleus icy fragments.
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