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Velocity dispersed ion signatures (VDIS) occurring at the plasmasheet boundary layer (PSBL) are a well reported feature. Theory has, however,predicted the existence of multiple ion beamlets, similar to VDIS,in the boundary plasma sheet (BPS), i.e. at latitudes below thePSBL. In this study we show evidence forthe multiple ion beamlets in Polar/TIMAS ion data and basicproperties of the ion beamlets will be presented. Statistics of theoccurrence frequency of ion multiple beamlets show that they are mostcommon in the midnight MLT sector and for altitudes above 4 RE,while at low altitude (≤3 RE), single beamlets at PSBL (VDIS) are morecommon. Distribution functions of ion beamlets in velocity spacehave recently been shown to correspond to 3-dimensional hollow spheres,containing a large amount of free energy. We also study correlation with ~100Hz waves and electron anisotropies and consider thepossibility that ion beamlets correspond to stable auroral arcs

annales geophysicae

Latitude-energy structure of multiple ion beamlets in Polar/TIMAS data in plasma sheet boundary layer and boundary plasma sheet below 6 &amp;lt;i&amp;gt;R&amp;lt;sub&amp;gt;E&amp;lt;/sub&amp;gt;&amp;lt;/i&amp;gt; radial distance: basic properties and statistical analysis