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Galactic cosmic-ray (GCR) flux short-term variations ($<$1 month) in theinner heliosphere are mainly associated with the passage of high-speed solarwind streams (HSS) and interplanetary (IP) counterparts of coronal massejections (ICMEs). Data gathered with a particle detector flown on board theESA LISA Pathfinder (LPF) spacecraft, during the declining part of the solarcycle 24 (February 2016 - July 2017) around the Lagrange point L1, have allowedto study the characteristics of recurrent cosmic-ray flux modulations above 70MeV n$^{-1}$. %These modulations are observed when the solar wind speed is $>$400 km s$^{-1}$ and/or the IP magnetic field intensity $>$ 10 nT. It is shownthat the amplitude and evolution of individual modulations depend in a uniqueway on both IP plasma parameters and particle flux intensity before HSS andICMEs transit. By comparing the LPF data with those gathered contemporaneouslywith the magnetic spectrometer experiment AMS-02 on board the InternationalSpace Station and with those of Earth polar neutron monitors, the GCR fluxmodulation was studied at different energies during recurrent short-termvariations. It is also aimed to set the near real-time particle observationrequirements to disentangle the role of long and short-term variations of theGCR flux to evaluate the performance of high-sensitivity instruments in spacesuch as the future interferometers for gravitational wave detection. Finally,the association between recurrent GCR flux variation observations in L1 andweak to moderate geomagnetic activity in 2016-2017 is discussed. Short-termrecurrent GCR flux variations are good proxies of recurrent geomagneticactivity when the B$_z$ component of the IP magnetic field is directednorthern.

Recurrent galactic cosmic-ray flux modulation in L1 and geomagnetic activity during the declining phase of the solar cycle 24