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We develop and apply a bespoke fitting routine to a large volume of solarwind electron distribution data measured by Parker Solar Probe (PSP) over itsfirst five orbits, covering radial distances from 0.13 to 0.5 au. Wecharacterise the radial evolution of the electron core, halo and strahlpopulations in the slow solar wind during these orbits. The fractionaldensities of these three electron populations provide evidence for the growthof the combined suprathermal halo and strahl populations from 0.13 to 0.17 au.Moreover, the growth in the halo population is not matched by a decrease of thestrahl population at these distances, as has been reported for previousobservations at distances greater than 0.3 au. We also find that the halo isnegligible at small heliocentric distances. The fractional strahl densityremains relatively constant ~1 % below 0.2 au, suggesting that the rise in therelative halo density is not solely due to the transfer of strahl electronsinto the halo.

Radial evolution of thermal and suprathermal electron populations in the slow solar wind from 0.13 to 0.5 au : Parker Solar Probe Observations