The first series of multi-wavelength observations were carried out between May 16 and June 04 1985. The orientation of SS433 was such that beams were expected to be nearly in the plane of the sky. The accretion disk is seen edge-on at this phase. The orientation at this epoche allowed the study of the dynamics of the beams of SS433 close to the centre of the binary system. The two most important observations were done with VLBI mapping and optical spectroscopy of the Doppler shifted lines.
The second series of multi-wavelength observations of SS433 were done in the spring of 1987, just after the phase when the Doppler shifted lines reached their maximum separation. At this point the angle between the beams and the line of sight is at its minimum and the disk is seen edge-on. During the 1987 campaign SS433 changed from the radio quiescent mode to the flaring state (see next chapter).
Fiedler et al. (1987) and Bonsignori-Facondi et al. (1986) have
presented a large database of radio observations of
SS433 taken at 2695 and 8085 MHz and 408 MHz. These observations have been
taken over a period of several years. The databases show that SS433
has flaring periods both at high and low frequencies. No stable periodicy
has been found. During these flares the spectral index can change (between
2695 and 8085 MHz) from to
.