Alingnment of magnetic dust aggregates in zero-g experiments

Details Alingnment of magnetic dust aggregates in zero-g experiments Alingnment of magnetic dust aggregates in zero-g experiments

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5161r&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5161

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Scientific paper

The basic mechanism of the first steps of generating planetesimals and cometesimals seems to be coagulation of small dust grains. In this process micron sized dust particles in early solar system (or regions around other young stars) stick together and form dust aggregates, growing objects which are formed to planets by gravitational forces. These preplanetary dust aggregation process in protoplanetary accretion disk may be accelerated by magnetic forces between the dust grains. There is evidence for potentially magnetized materials like iron-nickel in the early solar system. We verified former numerical simulations by Nübold and Glassmeier of this magnetic aggregation process by performing ground-based and micro gravity experiments. We injected magnetized micronsized dust particles into a vacuum chamber and observed them during microgravity. We noticed strong alignment of linear aggregates depending on Earth's magnetic field. The present work compares simulated aggregates to aggregates grown under micro gravity conditions, and it analyses alignment of these aggregates in external magnetic field on in-situ pictures recorded during microgravity experiments.

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