Evidence in a Glassy Cosmic Spherule from Antarctica for Grazing Incidence Encounters with the Earth's Atmosphere

Details Evidence in a Glassy Cosmic Spherule from Antarctica for Grazing Incidence Encounters with the Earth's Atmosphere Evidence in a Glassy Cosmic Spherule from Antarctica for Grazing Incidence Encounters with the Earth's Atmosphere

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..627g&link_type=abstract

Meteoritics, vol. 31, pages 627-632.

Computer Science

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Scientific paper

Cosmic dust accreted by the Earth can be extensively reprocessed during atmospheric encounters. The textures and compositions of reprocessed material provide important constraints by which the processes affecting extraterrestrial matter in the Earth's atmosphere can be better understood. Here we report results on an unusual Antarctic glassy cosmic spherule that demonstrates strong textural evidence for at least two grazing incidence encounters with the Earth's atmosphere prior to final re-entry. The particle consists of a central glassy core with four peripheral glass lobes which transect a silicate particle rim. The texture of the particle confirms previous theoretical speculations that some high velocity, low incidence angle interplanetary particles experience numerous encounters with the Earth's atmosphere, and also indicates that micrometeorites demonstrating multiple melting episodes should be interpreted with caution.

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