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The dynamics of the ion distribution function\udnear the Earth's bow shock is studied on the basis of quasi-3D measurements of\udion energy spectra in the range of 30–24200 eV/q with the Russian-Cuban CORALL\udinstrument on the INTERBALL/Tail-probe satellite. The instrument was designed\udfor observations of magnetospheric plasma and measures ions, in an angular range\udof 36°–144° from the Earth-Sun direction. Ion populations generated by the\udEarth bow shock are often observed upstream from the bow shock. In the\udsolar-wind stream compressed and heated by the passing of very dense magnetic\udcloud (CME), two types of these ion populations were measured upstream and\udbefore the bow shock crossing on 25 August 1995 at 07:37 UT. Both populations\udwere observed in the energy range above 2 keV. At ~06:20 UT, when the angle\udbetween the direction of the interplanetary magnetic field and normal to the bow\udshock VBn was ≃ 43° the instrument\udobserved a narrow, fast (~800 km/s) field-aligned beam moving from the Earth.\udAt ~07:30, when <vartheta>Bn ≃ 28°, the wide ion\udpitch-angle distribution was observed. A similar suprathermal ion population is\udobserved in the magnetosheath simultaneously with the solar-wind ion population\udbeing heated and deflected from the Sun-Earth direction. The similarity of\udobservations during the mentioned time-interval and under usual solar-wind\udconditions allows us to conclude that types of suprathermal ion populations\udupstream and downstream from the bow shock do not depend on the solar-wind\uddisturbance generated by magnetic cloud

annales geophysicae

Ion distribution dynamics near the Earth's bow shock: first measurements with the 2D ion energy spectrometer CORALL on the INTERBALL/Tail-probe satellite