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We have analyzed high time resolution (\geq6\uds) data during the onset and the decay phase of several energetic (\geq35 keV)\udion events observed near the Earth's bow shock by the CCE/AMPTE and IMP-7/8\udspacecraft, during times of intense substorm/geomagnetic activity. We found that\udforward energy dispersion at the onset of events (earlier increase of middle\udenergy ions) and/or a delayed fall of the middle energy ion fluxes at the end of\udevents are often evident in high time resolution data. The energy spectra at the\udonset and the decay of this kind of events show a characteristic hump at middle\ud(50-120 keV) energies and the angular distributions display either anisotropic\udor broad forms. The time scale of energy dispersion in the ion events examined\udwas found to range from several seconds to \sim1 h depending on the ion energies\udcompared and on the rate of variation of the Interplanetary Magnetic Field (IMF)\uddirection. Several canditate processes are discussed to explain the observations\udand it is suggested that a rigidity dependent transport process of\udmagnetospheric particles within the magnetosheath is most probably responsible\udfor the detection of this new type of near bow shock magnetospheric ion events.\udThe new class of ion events was observed within both the magnetosheath and the\udupstream region.  <b>Key words. </b>Interplanetary physics (energetic particles;\udplanetary bow shocks

Energy time dispersion of a new class of magnetospheric ion events observed near the Earth's bow shock