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Field-aligned beams are known to originate from the\udquasi-perpendicular side of the Earth's bow shock, while the diffuse\udion population consists of accelerated ions at the quasi-parallel\udside of the bow shock. The two distinct ion populations show typical\udcharacteristics in their velocity space distributions. By using\udparticle and magnetic field measurements from one Cluster spacecraft\udwe present a case study when the two ion populations are observed\udsimultaneously in the foreshock region during a high Mach number,\udhigh solar wind velocity event. We present the spatial-temporal\udevolution of the field-aligned beam ion distribution in front of the\udEarth's bow shock, focusing on the processes in the deep foreshock\udregion, i.e. on the quasi-parallel side. Our analysis demonstrates\udthat the scattering of field-aligned beam (FAB) ions combined with\udconvection by the solar wind results in the presence of\udlower-energy, toroidal gyrating ions at positions deeper in the\udforeshock region which are magnetically connected to the\udquasi-parallel bow shock. The gyrating ions are  superposed onto a\udhigher energy diffuse ion population. It is suggested that the\udtoroidal gyrating ion population observed deep in the foreshock\udregion has its origins in the FAB and that its characteristics are\udcorrelated with its distance from the FAB, but is independent on\uddistance to the bow shock along the magnetic field

Scattering of field-aligned beam ions upstream of Earth's bow shock