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Global water production rates were determined from the Lyman-{\alpha}emission of hydrogen around comet 103P/Hartley 2, observed with the SWAN (SolarWind ANisotropies) all-sky camera on the SOHO spacecraft from September 14through December 12, 2010. This time period included the November 4 flyby bythe EPOXI spacecraft. Water production was 3 times lower than during the 1997apparition also measured by SWAN. In 2010 it increased by a factor of ~2.5within one day on September 30 with a similar corresponding drop betweenNovember 24 and 30. The total surface area of sublimating water within {\pm}20days of perihelion was ~0.5 km^2, about half of the mean cross section of thenucleus. Outside this period it was ~0.2 km^2. The peak value was 90%, implyinga significant water production by released nucleus icy fragments.

Water Production by Comet 103P/Hartley 2 Observed with the SWAN Instrument on the SOHO Spacecraft