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We present an in depth analysis of the transient events, or glitches,detected at a rate of about one per day in the differential acceleration dataof LISA Pathfinder. We show that these glitches fall in two rather distinctcategories: fast transients in the interferometric motion readout on one side,and true force transient events on the other. The former are fast and rare inordinary conditions. The second may last from seconds to hours and constitutethe majority of the glitches. We present an analysis of the physical andstatistical properties of both categories, including a cross-analysis withother time series like magnetic fields, temperature, and other dynamicalvariables. Based on these analyses we discuss the possible sources of the forceglitches and identify the most likely, among which the outgassing environmentsurrounding the test-masses stands out. We discuss the impact of these findingson the LISA design and operation, and some risk mitigation measures, includingexperimental studies that may be conducted on the ground, aimed at clarifyingsome of the questions left open by our analysis.

Transient acceleration events in LISA Pathfinder data: properties and possible physical origin