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Abstract. Previous studies have shown that conjugateauroral features are displaced in the two hemispheres when the interplanetarymagnetic field (IMF) has a transverse ( Y ) component. It has also been shownthat a BY component is induced in the closed magnetosphere due to theasymmetric loading of magnetic flux in the lobes following asymmetric daysidereconnection when the IMF has a Y component. The magnetic field lines withazimuthally displaced footpoints map into a “banana”-shaped convection cellin one hemisphere and an “orange”-shaped cell in the other. Due to theParker spiral our system is most often exposed to a BY -dominated IMF. Thedipole tilt angle, varying between ± 34 ∘ , leads to warping of theplasma sheet and oppositely directed BY components in dawn and dusk in theclosed magnetosphere. As a result of the Parker spiral and dipole tilt,geospace is asymmetric most of the time. The magnetic storm on 17 August 2001offers a unique opportunity to study the dynamics of the asymmetric geospace.IMF BY was 20–30 nT and tilt angle was 23∘ . Auroral imagingrevealed conjugate features displaced by 3–4 h magnetic local time. Thelatitudinal width of the dawnside aurora was quite different (up to 6∘ ) in the two hemispheres. The auroral observations together withconvection patterns derived entirely from measurements indicate dayside,lobe and tail reconnection in the north, but most likely only dayside andtail reconnection in the Southern Hemisphere. Increased tail reconnectionduring the substorm expansion phase reduces the asymmetry.

The asymmetric geospace as displayed during the geomagnetic storm on 17 August 2001