CAOSP abstracts, Volume: 33, No.: 3, year: 2003

Abstract: Fermo meteorite, who fell on September 25, 1996 (Molin et al. 1997) is analysed from the viewpoint of its remanent magnetization (RM) and a simplified model describing heating of a meteoroid is discussed. The main carrier of RM of the H3-5 Fermo chondrite, according to Curie temperature and the results of thermal demagnetization of samples, is probably the taenite (γ phase). The results have approved that the intensity and the directional stability (declination and inclination) of RM of Fermo disappeared completely at 500-600°C. A solution of mathematical model for penetration of temperature inside a spherical meteoroid heated from its surface has shown that there exists some time interval in which the sphere in almost of half of its radius was heated to the temperature above or close to the Curie temperature of taenite (TC ≈ 560-600°C). This means that when the meteoroid becomes so hot (500-600°C) any eventual extraterrestrial magnetization cannot survive and completely disappears. A new RM probably of thermoremanent (TRM) origin was induced by the geomagnetic field after fall of the meteorite on the Earth's surface.

Full text version of this article in PostScript (600dpi) format compressed by gzip; or in PDF.

Back to:
CAOSP Vol. 33 No. 3 index
CAOSP archive main index
CAOSP main page
Astronomical Institute home page

Valid HTML 4.01! Valid CSS!

Last update: November 10, 2003