  Global water production rates were determined from the Lyman-{\alpha}
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.
