Solar wind sample from 2006. (a) Solar wind proton velocity and density measurements, at 64-sec cadence. (b) Solar wind proton temperature measurements, at 64-sec cadence. Plasma types are based on Xu & Borovsky (2015), calculated at a 12-min cadence. (c) Twelve-minute averaged solar wind magnetic field measurements. The B components are in geocentric solar ecliptic coordinates. (d) avQ of Fe and O with uncertainties at a 12-min cadence. The arrows indicate trends of the variation in the avQ. The red rectangle marks an anticorrelated structure, which is discussed in Sect. 3.2.