Fig. 3
From: An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism
Magnetic field simulations of single long solenoid at a 10 mm and b 20 mm from the central axis. The black symbol represents the result of conventional solenoid and the red symbol represents the result of a solenoid with a reverse straight wire at solenoid axis. Insets in b show detail measurements over the central 50-cm highlighting period nature of the field, which is caused by the solenoid pitch