LASCO C2 images from 29 November and 5 December 1998. The equator and the 
direction to Ulysses (17 degrees south of the equator) are also shown. 
At the time of this quadrature, the radial to Ulysses was crossing first
through a dark area and, later on, through a bright streamer region. 
The inner and outer circles show, respectively, the solar disk size and
the lower edge of LASCO C2 field of view (at 2 solar radii).  UVCS made 
observations at 3.5 and 4.5 solar radii; as shown in the next plots, the 
transition from a dark to a bright region heavily affects the plasma
status at these coronal altitudes and in the interplanetary medium.