We invite all participants to the keynote lecture on Tuesday November 6. The keynote lecture: 'Radio Science Issues: the radio spectrum - an explosion of users for a unique limited resource' by François Lefeuvre, head of the International Radio Science Union, URSI, starts at 18:30u and will take place in the Lippens Auditorium of the Royal Library. The lecture will be followed by a welcome reception in the Music instrument museum. All participants are kindly invited to this particular and interesting event. There will be a ceremony in the framework of the International Heliosphysical Year and participants are offered the opportunity to have a musical tour through the museum. More information will follow shortly.