Interplanetary dust fluxes measured by STEREO/WAVES at 1AU

Details Interplanetary dust fluxes measured by STEREO/WAVES at 1AU Interplanetary dust fluxes measured by STEREO/WAVES at 1AU

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33b2060b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH33B-2060

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[6213] Planetary Sciences: Solar System Objects / Dust

Scientific paper

Dust particles can be detected with radio and plasma wave instruments. The high velocity impact of a dust particle generates a small crater on the spacecraft : the dust particle and the crater material are vaporized. This creates an electrical charge which is measured with plasma instruments designed to measure electric fields. Since 2007 the STEREO/WAVES instrument aboard the twin STEREO spacecraft carries out radio and plasma wave measurements near 1AU. The S/WAVES electric field sensors are formed by three orthogonal, monopole antennas of length 6 meters each. The instruments recorded a large number of events due to dust impacts, since the detection surface is a few meters which is larger than that used in dedicated dust experiments. We distinguish two kinds of dust generated signals : the first one consists of a large impulse on one monopole and a much smaller and well correlated signal on the two other monopoles; these signals are produced by nano-dust grains impacts. The second category consists of signals having the same order of magnitude on the three monopoles, we interpret them as being produced by dust grains of sub-micron size originating from the local interstellar cloud and by β-meteorites. Here, we present a study of these fluxes during 4 years of the STEREO mission and their modelisation. We determine the direction of arrival of interstellar dust and its temporal variation at 1 AU between 2007 and 2010. We also give an estimate of the mass distribution of nano-dust at 1 AU.

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