Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh12a..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH12A-07
Physics
Plasma Physics
[2129] Interplanetary Physics / Interplanetary Dust, [2199] Interplanetary Physics / General Or Miscellaneous, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration
Scientific paper
Recent plasma wave measurements onboard STEREO detect hypervelocity nano dust near 1 AU. The derived flux of nano dust agrees well with the cumulative number density distribution of larger interplanetary dust particles measured at 1 AU and its extrapolation to smaller sizes. The dynamics of nano dust differs, however, from that of larger dust particles. Dust of sizes a micrometer and larger is either locally produced or produced at larger distances and reaches 1 AU as a result of the Poynting Robertson effect. Dust in the size range of several tenth micrometer is expelled in hyperbolic orbits by the solar radiation pressure. Both dust components have velocities of the order of up to several 10 km/s. Nano dust observed at 1 AU is generated close to the Sun and passes 1 AU while being ejected outward by electromagnetic forces. The acceleration of nano dust is similar to the pick up process of ions. The expelled nano dust can reach velocities close to that of the solar wind and nano dust is responsible for the hypervelocity dust impacts observed at STEREO. The effects competing with ejection are the trapping of nano dust in bound orbits within approximately 0.2 AU from the Sun and the destruction of nano dust by sublimation and sputtering. We estimate the flux of nano dust from considering its generation by dust collisions, its trajectories in the solar wind and its destruction by sputtering in the solar wind. The flux estimates are compared to nano dust fluxes derived from plasma wave experiments.
Czechowski Andrzej
Mann Ian
Meyer-Vernet Nicole
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