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A.M. Harri, J.T.T. Mäkinen (FMI, Finland), J.L. Bertaux, E. Quémerais (SA, France)
The Solar Wind Anisotropies (SWAN) instrument onboard the Solar and Heliospheric Observatory (SOHO) is a scanning Lyman-alpha imager capable of imaging the entire sky within one day. It can be used to estimate cometary water production rates because the photodissociated neutral hydrogen resonantly scatters Solar Lyman-alpha light. All comets brighter than approximate visual magnitude of 11 are routinely recorded by SWAN, and in addition to that, specific observing sessions are conducted with some comets. In anticipation of the Deep Space 1 mission to Comet Borrelly, the comet was observed by SWAN from August 2001 on, and daily water production rates were determined.