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Non-recurrent short term variations of the galactic cosmic-ray (GCR) fluxabove 70 MeV n$^{-1}$ were observed between 2016 February 18 and 2017 July 3aboard the European Space Agency LISA Pathfinder (LPF) mission orbiting aroundthe Lagrange point L1 at 1.5$\times$10$^6$ km from Earth. The energy dependenceof three Forbush decreases (FDs) is studied and reported here. A comparison ofthese observations with others carried out in space down to the energy of a fewtens of MeV n$^{-1}$ shows that the same GCR flux parameterization applies toevents of different intensity during the main phase. FD observations in L1 withLPF and geomagnetic storm occurrence is also presented. Finally, thecharacteristics of GCR flux non-recurrent variations (peaks and depressions) ofduration $<$ 2 days and their association with interplanetary structures areinvestigated. It is found that, most likely, plasma compression regions betweensubsequent corotating high-speed streams cause peaks, while heliosphericcurrent sheet crossing cause the majority of the depressions.

Forbush decreases and $<$ 2-day GCR flux non-recurrent variations studied with LISA Pathfinder