It passed within NUMBER@1 km of PERSON@1 's surface , downstream of ORGANIZATION@1 's magnetic field , and observed the resulting plasma wake as it had with other moons , such as PERSON@2 and Tethys .

It passed within NUMBER@1 km of PERSON@1 's surface , downstream of ORGANIZATION@1 's magnetic field , and saw the resulting plasma wake as it had with other moons , such as PERSON@2 and Tethys .
