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The Cluster spacecraft\ud experienced several boundary layer encounters when flying outbound from the\ud magnetosphere to the magnetosheath in the dusk sector on 14 January 2001. The\ud dayside boundary layer was populated by magnetosheath electrons, but not with\ud quite as high densities as in the magnetosheath itself. The Cluster ground\ud track was calculated using the Tsyganenko-96 model which appears to be a strong\ud tool for combining high-altitude satellite and ground observations, given that\ud the solar wind conditions are known. This paper focuses on identifying auroral\ud responses corresponding to boundary layer dynamics observed by Cluster. The\ud first boundary layer encounter studied was a brief visit into a closed LLBL,\ud most likely due to a boundary wave that travelled tailward over the spacecraft.\ud A corresponding equatorward and eastward movement was seen in the post-noon\ud aurora between Greenland and Svalbard. The second boundary encounter was in a\ud high-latitude cusp, and occurred as a consequence of a transient\ud reconfiguration of the cusp. The cusp expanded duskward over the spacecraft\ud into the late post-noon sector. NOAA-12 probed the 16:30 MLT sector of this\ud auroral activity, and measured a 1.4 keV electron beam located poleward of the\ud 30 keV electron-trapping boundary. A sequence of three moving auroral forms\ud emanating from this active region are likely candidates for flux transfer\ud events. The auroral signatures are discussed in relation to earlier\ud observations, and appear to be an example of accelerated electrons/discrete\ud post-noon aurora on open magnetic field lines.  <b>Key words. </b>Ionosphere (particle\ud precipitation) Magnetospheric physics (auroral phenomena; magnetopause, cusp\ud and boundary layers

Cluster boundary layer measurements and optical observations at magnetically conjugate sites