NONCONTACT COMMUNICATION MEDIUM, MAGNETIC TAPE CARTRIDGE, OPERATION METHOD OF NONCONTACT COMMUNICATION MEDIUM, AND PROGRAM

A noncontact communication medium includes a power generator that has a coil and generates power with application of an external magnetic field from an outside to the coil, a clock signal generator that generates a clock signal using the power, and a processor that operates using the power and executes processing on a command included in the external magnetic field. In a case where a processing result signal indicating a processing result obtained with the execution of the processing is transmitted to the outside through the external magnetic field by the coil, the processor changes a signal level of the processing result signal according to intensity of the external magnetic field.