Determination of the Electron Thermal Conductivity across Magnetic Surfaces in the FM-1 Spherator

A new approach was taken to measure the electron thermal conductivity across magnetic surfaces by utilizing localized upper hybrid resonance heating. The electron thermal conductivity coefficient measured in the FM-1 spherator was increased with an increase of electron temperature for $T_e>1\mathrm{}$ eV. The dependence is similar to that of the particle diffusion coefficient. The absolute value was 10-20 times smaller than the Bohm coefficient.