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. We use Van Allen Probes (Radiation Belt Storm Probes A and B, henceforthRBSP-A and RBSP-B) and GOES-13 and GOES-15 (henceforth G-13 and G-15) multipointmagnetic field, electric field, plasma, and energetic particle observationsto study the spatial, temporal, and spectral characteristics ofcompressional Pc5 pulsations observed during the recovery phase of a stronggeomagnetic storm on 1 January 2016. From ∼ 19:00 to 23:02 UT, successive magnetospheric compressions enhanced the peak-to-peakamplitudes of Pc5 waves with 4.5–6.0 mHz frequencies from 0–2 to 10–15 nT atboth RBSP-A and RBSP-B, particularly in the prenoon magnetosphere. Poloidal Pc4pulsations with frequencies of ∼ 22–29 mHz were present in theradial Bx component. The frequencies of these Pc4 pulsations diminished withincreasing radial distance, as expected for resonant Alfvén wavesstanding along field lines. The GOES spacecraft observed Pc5 pulsations withsimilar frequencies to those seen by the RBSP but Pc4 pulsations with lowerfrequencies. Both RBSP-A and RBSP-B observed frequency doubling in the compressionalcomponent of the magnetic field during the Pc5 waves, indicating ameridional sloshing of the equatorial node over a combined range in ZSMfrom 0.25 to −0.08 Re, suggesting that the amplitude of this meridionaloscillation was ∼ 0.16 Re about an equatorial node whose meanposition was near ZSM=∼0.08 Re. RBSP-A and RBSP-B HOPE (Helium Oxygen Proton Electron)and MagEIS (Magnetic Electron Ion Spectrometer) observations provide the first evidence for a correspondingfrequency doubling in the plasma density and the flux of energetic electrons,respectively. Energetic electron fluxes oscillated out of phase with themagnetic field strength with no phase shift at any energy. In the absence ofany significant solar wind trigger or phase shift with energy, we interpretthe compressional Pc5 pulsations in terms of the mirror-mode instability.

Multipoint observations of compressional Pc5 pulsations in the dayside magnetosphere and corresponding particle signatures