Dandouras, I.

Kis, Árpád

Klecker, B.

Lemperger, István

Lucek, E. A.

Scholer, M.

Wesztergom, Viktor

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DIFFUSIVE SCATTERING AND WAVE-PARTICLECOUPLING IN FRONT OF THE EARTH’SQUASI-PARALLEL BOW SHOCKA. Kis2, M. Scholer1, B. Klecker1, E. A. Lucek3, I. Dandouras4, I.Lemperger2, V. Wesztergom21Max-Planck-Institut fr extraterrestrische Physik, Garching, Germany2Research Centre for Astronomy and Earth Sciences, Sopron, Hungary3The Blackett Laboratory, Imperial College, London, UK4CESR, Toulouse, FranceWe study several upstream ion events using Cluster simultaneous multi-spacecraft data at times of large inter-spacecraft separation distance. Weanalyze the pitch-angle scattering of energized ions by upstream waves anddemonstrate that under favourable interplanetary conditions the scatteringcan become stronger than usual thus making the first-order Fermi accelera-tion at the bow shock more efficient. On the other hand, the upstream wavesthat scatter the energetic ions are thought to be generated locally by the en-ergetic ions themselves. Therefore the characteristics of the upstream wavesand of the energetic ions are intimately connected. In our study we comparethe predictions of the quasi-linear theory of wave excitation at each eventwith the observations in two ion energy ranges (i.e, 10-18 keV and 18-32keV) and as a function of distance from the bow shock.1

DIFFUSIVE SCATTERING AND WAVE-PARTICLE COUPLING IN FRONT OF THE EARTH’S QUASI-PARALLEL BOW SHOCK

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