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

*Author(s):* Hvoždara, M.; Orlický, O.; Funaki, M.; Cevolani, G.; Porubčan, V.; Túnyi, I.
*Journal:* Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 33, no. 3, p. 193-208.
*Date:* 10/2003
*Title:* A possible assessment of an origin of remanent magnetism of the Fermo H-chondrite breccia: a study of diffusion of heat from the surface of the meteorite into its interior
*Keyword(s):* meteorite, H3-5 Fermo chondrite, taenite, thermoremanent magnetization, mathematical model
*Pages:* 193 -- 208

**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 (T_{C} ≈
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.

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