EISCAT MEASUREMENTS OF INTERPLANETARY SCINTILLATION

EISCAT has been used to make three types of measurement of the charact eristics of the solar wind in the range 10-120 solar radii. The rms fl uctuation in the total power received from a single source can be meas ured to provide a 'scintillation index'. The cross-correlation of the scintillations observed at two sites can be used to measure the veloci ty of the solar wind, indicating at the same time whether one or more velocity streams control the correlation. The rate al which the correl ation coefficient drops as the transverse separation of the two beams increases gives an indication of the transverse scales of the irregula rities. Examples are given of all three types of measurement made duri ng campaign periods between 1990 and 1993.