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We present a multi-instrument study of the ionospheric response to anorthward turning of the IMF. The observations were made in the near-noon(11:00 MLT) sector on Svalbard (at 75° MLAT). The data set includes auroralobservations, ionospheric flows obtained from the EISCAT and CUTLASS radars,the spectral width of the HF radar backscatter, particle precipitation andplasma flow data from the DMSP F13 satellite, and Pc1 frequency bandpulsations observed by induction magnetometers. Careful collocation of allthe observations has been made with the HF radar backscatter located by aray-tracing procedure utilizing the elevation angle of arrival of thesignals and an ionospheric plasma density profile. Prior to IMF turningnorthward, three auroral arcs were observed at the poleward boundary of theclosed llbl, inside the llbl, and in the equatorward part of the llbl, respectively. Thenorthward IMF turning was accompanied by enhanced HF radar returns with abroad Doppler spectrum collocated with the arcs. The auroral arcs shiftedpoleward whereas the backscatter region moved in the opposite direction,which is consistent, respectively, with reconnection beyond the cusp and thecapturing of magnetosheath plasma during northward IMF. Locally, magneticnoise enhancement in the Pc1 frequency band occurred simultaneously with theanomalous radar backscatter, and the absence of such signals at more remotemagnetic observatories indicates a local generation of the Pc1 turbulence,which is collocated with the radar backscatter. Finally, we discuss possibleinterpretation errors which may be caused by limited observational data

annales geophysicae

Optical, radar, and magnetic observations of magnetosheath plasma capture during a positive IMF &amp;lt;I&amp;gt;B&amp;lt;sub&amp;gt;z&amp;lt;/sub&amp;gt;&amp;lt;/I&amp;gt; impulse