The measurements made by SPARTAN 201 will be used in conjunction with those from the Ulysses spacecraft , which was launched in October 1990 and which detected the solar wind from the south polar corona as SPARTAN observed the source region of that wind as well as other portions of the Sun 's corona . Data from SPARTAN 201 will also calibrate measurements to be made by the European Space Agency ( ESA ) -NASA Solar and Heliospheric Observatory , scheduled for launch in 1995 .