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We present observations of Almost Monoenergetic Ion (AMI) events in the energy range\udof 100–1200 keV detected with\udthe Solar Electron and Proton Telescope (SEPT) onboard both STEREO spacecraft.\udThe energy spectrum of AMI events contain 1, 2, or 3 narrow peaks with the relative width\udat half maximum of 0.1–0.7 and their energy maxima varies for different events from 120 to 1200 keV.\udThese events were detected close to\udthe bow-shock (STEREO-A&B) and to the magnetopause at STEREO-B as well as unexpectedly far\udupstream of the bow-shock and far away from\udthe magnetotail at distances up to 1100 RE (STEREO-B) and 1900 RE (STEREO-A).\udWe discuss the origin of AMI events, the connection\udto the Earth's bow-shock and to the magnetosphere, and the conditions of the interplanetary medium and\udmagnetosphere under which these AMI bursts occur. Evidence that the detected spectral peaks\udwere caused by quasi-monoenergetic beams of protons, helium, and heavier ions are given. Furthermore,\udwe present the spatial distribution of all AMI events from December 2006 until August 2007

STEREO/SEPT observations of upstream particle events: almost monoenergetic ion beams