The influence of the laboratory magnetic field magnitude in the Thellier-Coe method on the results of determining the “archeointensity” of the magnetic field was studied. The experiments were conducted on the same samples of artificial “Neolithic” ceramics and medieval bricks from Veliko-Tarnovo town in laboratory magnetic fields of 20, 35, 50, 75 and 100 µT. The obtained results show that for the studied samples the magnitude of magnetic field induction determined in the Thellier-Coe experiments (“archeointensity”) depends on the magnitude of the laboratory magnetic field induction in the Thellier-Coe method (increases approximately according to a quasi-logarithmic law). It is assumed that the reason for the obtained dependence is the nonlinear dependence of thermoremanent magnetization on the magnetic field magnitude (in the range of 20-100 µT) in which it was created.
О. В. Пилипенко (Wed,) studied this question.