Abstract
Linearity of a high-μ metal core solenoid as a magnetic sensor has been checked, comparing its output to that from an air-core loop antenna. Two induction magnetometer systems using these different types of sensors both parallel to the magnetic N-S direction, were run simultaneously in the same manner as for actual field observations. The outputs from these systems during a moderately intense Pc 3 event were compared with each other. No distortion of the magnetic signals due to the high-μ metal core sensor was detected. Theoretical consideration is presented also as to why high-μ metal core solenoids give rise to no signal distortion.
