Dust from the sun

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Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..369m&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 3, Nov. 1977, p. 369-375. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

1

Cosmic Dust, Interplanetary Dust, Rare Earth Elements, Solar Atmosphere, Sputtering, Electric Charge, Heavy Elements, Magnetic Effects

Scientific paper

It was previously proposed that the sun might be the source of rare-earth-rich submicron particles detected in rocket flights from Kiruna, Sweden, but not in flights originating from sites at lower latitudes. The problem of sputtering in the solar atmosphere is examined and found to be serious enough that a nonsolar origin must be considered for the particles. The motion of grains in a variety of solar model atmospheres is calculated, and it is shown that sputtering rates in active regions are probably so large that submicron grains of rare-earth-rich material are reduced to such small sizes that they cannot be repelled from the sun by radiation pressure. It is suggested that the rare-earth-rich submicron particles detected at Kiruna but nowhere else are the product of local mining of rare-earth-rich ores in the vicinity of Kiruna.

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