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New measurements using radio and plasma-wave instruments in interplanetaryspace have shown that nanometer-scale dust, or nanodust, is a significantcontributor to the total mass in interplanetary space. Better measurements ofnanodust will allow us to determine where it comes from and the extent to whichit interacts with the solar wind. When one of these nanodust grains impacts aspacecraft, it creates an expanding plasma cloud, which perturbs thephotoelectron currents. This leads to a voltage pulse between the spacecraftbody and the antenna. Nanodust has a high charge/mass ratio, and therefore canbe accelerated by the interplanetary magnetic field to speeds up to the speedof the solar wind: significantly faster than the Keplerian orbital speeds ofheavier dust. The amplitude of the signal induced by a dust grain grows muchmore strongly with speed than with mass of the dust particle. As a result,nanodust can produce a strong signal, despite their low mass. The WAVESinstruments on the twin Solar TErrestrial RElations Observatory spacecraft haveobserved interplanetary nanodust particles since shortly after their launch in2006. After describing a new and improved analysis of the last five years ofSTEREO/WAVES Low Frequency Receiver data, a statistical survey of the nanodustcharacteristics, namely the rise time of the pulse voltage and the flux ofnanodust, is presented. Agreement with previous measurements and interplanetarydust models is shown. The temporal variations of the nanodust flux are alsodiscussed.

On the Effect of the Interplanetary Medium on Nanodust Observations by the Solar Terrestrial Relations Observatory