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In this second part of our statistical study of the\udmid-altitude cusp, we compare the cusp morphology, as seen in the Cluster\udion spectrometer (CIS), to the interplanetary magnetic field (IMF)\udorientation. We first recall the method we have used a) to define the cusp\udproperties, b) to sort IMF conditions or behaviour in classes, c) to\uddetermine the proper time delay between the solar wind monitors and Cluster.\udThen, we define a few morphological features of the cusp and we relate these\udto the prevailing IMF. Our results reveal, among other things, that the\udoccurrence of clearly dispersed ion structures in the cusp is 48%. From\udthese dispersions, we infer the distance to reconnection site, which we\udrelate to external conditions. In all other cases, the cusp exhibits a more\uddisturbed behaviour in terms of ion structures and fall in our\ud"discontinuous" or "irregular" categories. Among these, a few\udinteresting cases of discontinuous cusps occurring under stable IMF\udconditions have been identified. They all occur when the IMF is dominated by\udits Y-component, which plays in principle in favour of anti-parallel\udreconnection but their wide MLT and latitudinal distributions is a priori\udincompatible with the anti-parallel reconnection hypothesis solely

Cluster survey of the mid-altitude cusp – Part 2: Large-scale morphology