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In this study, we examined a morningside Pi2 pulsation, with a non-substorm signature, that occurred in very quiet\udgeomagnetic conditions (Kp = 0) at 05:38 UT on December 8, 2012, using data obtained by Van Allen Probes A and B\ud(VAP-A and VAP-B, respectively) and at a ground station. Using 1 sec resolution vector magnetic field data, we measured\udthe X-component of the pulsation from the Abu Simbel ground station (L = 1.07, LT = UT +2 hr, where LT represents local\udtime) in Egypt. At the time of the Pi2 event, Abu Simbel and VAP-A (L = 3.3) were in the morning sector (07:38 LT and 07:59\udMLT, respectively, where MLT represents magnetic local time), and VAP-B was in the postmidnight sector (04:18 MLT and\udL = 5.7). VAP-A and VAP-B observed oscillations in the compressional magnetic field component (Bz), which were in close\udagreement with the X-component measurements of the Pi2 pulsation that were made at Abu Simbel. The oscillations\udobserved by the satellites and on the ground were in phase. Thus, we concluded that the observed morningside Pi2\udpulsation was caused by the cavity resonance mode rather than by ionospheric current systems

Morningside Pi2 Pulsation Observed in Space and on the Ground