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AbstractFor the first time in situ measurements of interplanetary dust have been performed between 0.3 AU and 1 AU from the sun by the micrometeoroid experiment on board Helios A. The measured particle masses are between 10−15g and 10−8g and their measured speeds are between 2 km/sec and 20 km/sec. Particle impacts are identified by the time-of-flight spectra of the ions released upon impact. 15 large particles (m ≥ 10−12g) were detected from Dec. 15, 1974 to Sept. 5, 1975. They show a strongdoi:10.1017/s0252921100051642 fatcat:q3hvx4vpcbbghcbuhn7dweguyy