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The subject of switchbacks, defined either as large angular deflections orpolarity reversals of the magnetic field, has generated substantial interest inthe space physics community since the launch of Parker Solar Probe (PSP) in2018. Previous studies have characterized switchbacks in several differentways, and have been restricted to data available from the first few orbits.Here, we analyze the frequency of occurrence of switchbacks per unit distancefor the first full eight orbits of PSP. In this work, are considered switchbackonly the events that reverse the sign of magnetic field relative to a regionalaverage. A significant finding is that the rate of occurrence falls off sharplyapproaching the sun near 0.2 au (40 $R_\odot$), and rises gently from 0.2 auoutward. The analysis is varied for different magnetic field cadences and fordifferent local averages of the ambient field, confirming the robustness of theresults. We discuss implications for the mechanisms of switchback generation. Apublicly available database has been created with the identified reversals.

Magnetic Switchback Occurrence Rates in the Inner Heliosphere: Parker Solar Probe and 1 au