An apparatus for sensing mis-alignment between an aircraft inertial reference frame and a reference frame of an attached sensor is disclosed. 5% Li2O, 10\u201325% of TiO2, 15\u201325% Al2O3, 10\u201325% of Fe3O4, and 60\u201370% of SiO2 mixed with about 1% by weight of Fe2O3, preferably red iron oxide. The magnets cause electron-cyclotron resonance for the electrons of the plasma thus creating conditions for efficient absorption of the microwave energy.