Dust Telescopes and Active Dust Collectors: Linking Dust to Their Sources

Details Dust Telescopes and Active Dust Collectors: Linking Dust to Their Sources Dust Telescopes and Active Dust Collectors: Linking Dust to Their Sources

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p33c1579d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P33C-1579

Physics

[2114] Interplanetary Physics / Energetic Particles, [2194] Interplanetary Physics / Instruments And Techniques

Scientific paper

Cosmic dust particles from remote sites and times are treasures of information. By determining the dust particles' source and their elemental properties, we can learn about the environments, where they were formed and processed. Born as stardust in the cool atmospheres of giant stars or in novae and supernovae explosions, the particles are subsequently modified in the interstellar medium. Interplanetary dust that originates from comets and asteroids represents even more processed material at different stages of Solar System evolution. Interstellar and interplanetary dust particles from various sources can be detected and analyzed in the near-Earth space environment. The newly developed instruments Dust Telescope and Active Dust Collector are able to determine the origin of dust particles and provide their elemental composition. A Dust Telescope is a combination of a Dust Trajectory Sensor (DTS) [1] together with an analyzer for the chemical composition of dust particles in space. Dust particles' trajectories are determined by the measurement of induced electric signals when a charged grain flies through a position sensitive electrode system. A modern DTS can measure dust particles as small as 0.2 µm in radius and dust speeds up to 100 km/s. Large area chemical analyzers of 0.1 m2 sensitive area have been tested at a dust accelerator and it was demonstrated that they have sufficient mass resolution to resolve ions with atomic mass number up to >100 [2]. The advanced Dust Telescope is capable of identifying interstellar and interplanetary grains, and measuring their mass, velocity vector, charge, elemental and isotopic compositions. An Active Dust Collector combines a DTS with an aerogel or other dust collector materials, e.g. like the ones used on the Stardust mission. The combination of a DTS with a dust collector provides not only individual trajectories of the collected particles but also their impact time and position on the collector which proves essential to find collected sub-micron sized grains on the collector. [1] Auer, et al., Rev. Sci. Instrum. 79, 084501 2008 [2] Srama et al., Earth, Moon and Planets, DOI: 10.1007/s11038-005-9040-z, 2005; Sternovsky et al., Rev. Sci. Instrum. 78, 014501, 2007

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