"Helios" also allowed an increase in data to be collected on comets, observing the passage of C/1975 V1 (West) in 1976, C/1978 H1 (Meir) in November 1978 and C/1979 Y1 (Bradfield) in February 1980. During the last probe, instruments observed a disturbance wind solar which translated later by a break in the comet's tail. The plasma analyzer showed that the acceleration phenomena of the high-speed solar wind were associated with the presence of coronal holes. This instrument also detected, for the first time, the helium ions isolated in the solar wind. In 1981, during the peak of solar activity, the data collected by "Helios-A" at a short distance from the Sun helped complete visual observations of coronal mass ejections performed from the Earth's orbit. Data collected by magnetometers two probes "Helios" supplemented with interplanetary probes "Pioneer" and "Voyager" were used to determine the direction of the magnetic field at staggered distances from the Sun.