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We report recent observations of energetic particles at energies 1–40 MeV/n\udmade by the COSPIN/LET instrument onboard the Ulysses spacecraft during the period\udof intense solar activity in August/September 2005 during the declining\udphase of solar cycle 23. Ulysses, having started its climb to high southern\udlatitudes for the third time, was located at ~5 AU, at a\udhelio-latitude of ~30 degrees south. It detected the arrival of a\udsolar wind compound stream resulting from the merging of a series of fast\udhalo CMEs ejected from the Sun in late August and early September 2005 and\udtheir interaction with the pre-existing pattern of solar wind Stream\udInteraction Regions (SIRs) in the ambient medium through which they\udpropagated. The heavy ion intensities are observed by COSPIN/LET to remain\udelevated for at least 20 days following the very intense X17.0/3B solar\udflare on 7 September and its associated very fast CME (plane of sky\udprojected CME speed ~2400 km s−1). We carry out an analysis of\udthe composition of the particle increases observed at the location of the\udspacecraft. Although the composition signatures were predominantly Solar\udEnergetic Particle (SEP)-like, after the passage of the compound stream over\udUlysses, in association with a characteristic forward and reverse shock pair, the\udobservations showed evidence of an enhanced He content

annales geophysicae

Energetic particle measurements from the &amp;lt;I&amp;gt;Ulysses&amp;lt;/I&amp;gt;/COSPIN/LET instrument obtained during the August/September 2005 events