Note 1 to entry: $H_{\mathrm{c2}}$ is a function of temperature.

Note 2 to entry: The upper critical field strength depends on the direction of applied magnetic field for anisotropic superconductors such as REBCO and bismuth-based oxide superconductors.

Note 3 to entry: This entry was numbered 815-10-24 in IEC 60050-815:2015.