Here we report that the measurements of the near - Earth interplanetary magnetic field reveal that the total magnetic field leaving the sun has risen by a factor 1.4 since 1964.» (c3headlines.com)
References: Richardson et al. (2002), «Long - term trends in interplanetary magnetic field strength and solar wind structure during the twentieth Century», J. Geophys. (realclimate.org)
«The solar wind, because it is an extended ionized gas of very high electrical conductivity, drags some magnetic flux out of the Sun, thereby filling the heliosphere with the weak interplanetary magnetic field. (c3headlines.com)