Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..107..155n&link_type=abstract
Icarus, vol. 107, p. 155
Physics
21
Solar Corona, Solar Magnetic Field, Iron, Magnetic Materials, Grain Size, Coagulation, Refractory Metals, Interstellar Matter
Scientific paper
The process of grain coagulation in the primitive nebula is examined with reference to results of laboratory experiments. Magnetically hard, open nets of very small iron metal grains are found to rapidly form via coagulation in a laboratory system in which large-scale coagulation has never occurred before. It is hypothesized that magnetically induced dipole-dipole interactions between the magnetized iron grains increase the grain coagulation efficiency by several orders of magnitude and probably also increase the strength of the interparticle bonds in the aggregate. It is inferred that very small iron grains formed by high temperature processing of interstellar grains in energetic events in the protosolar nebula may have been magnetized by exposure to even transient nebular fields. It is further suggested that the presence of conductive fractal aggregates observed in modern-day protostellar disks could be explained by the enhanced coagulation efficiency of very small magnetized iron particles.
Berg Otto
Faris James
Nuth Joseph Andrew III
Wasilewski Peter
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