Between December 1997 and March 1998 Equator-S made a number of excursions into the dawnside magnetosheath, over a range of local times between 6:00 and 10:40 LT. Clear mirror-like structures, characterised by compressive ̄uctuations in |B| on occasion lasting for up to 5 h, were observed during a signi®cant fraction of these orbits. During most of these passes the satellite appeared to remain ...

Observations of a ̄ux transfer event (FTE) have been made simultaneously by the Equator-S spacecraft near the dayside magnetopause whilst corresponding transient plasma ̄ows were seen in the nearconjugate polar ionosphere by the CUTLASS Finland HF radar. Prior to the occurrence of the FTE, the magnetometer on the WIND spacecraft ~226 RE upstream of the Earth in the solar wind detected a southwa...

[1] We present a case study of a large deformation of the magnetopause on November 26, 2008. The investigation is based on observations of five THEMIS spacecraft located at the dawn flank in the magnetosphere and magnetosheath, on Cluster measurements at the dusk magnetosheath, and is supported by ACE solar wind monitoring. The main revelation of our study is that the interaction of the IMF dis...

The magnetopause locations as determined by the Explorer 12 SpL charged-particle detector and the Imp I plasma experiment can be used to study the relation between the solar wind parameters and geomagnetic activity. As will be seen, no strong correlation is evident between the size of the magnetosphere, as determined from magnetopause crossings, and geomagnetic activity indexes. It is argued th...

With the advent of soft X-ray imaging enabling global magnetopause detection, it is critical to use reconstruction techniques derive 3-dimensional location from 2-dimensional images. One important assumptions adopted by most that direction with maximum emission tangent magnetopause, which has not been validated in observation so far. This paper analyzes a magnetospheric solar wind charge exchan...

The magnetosphere of the Earth and the other planets contain a variety of low frequency (f < fp, fp being the proton gyrofrequency) waves. Several sources are known to contribute to these uctuations: (1) Waves present in the solar wind (mainly those occurring in the foreshock) are convected in the magnetosheath and possibly ampli ed passing through the shock front. (2) The bow shock modi es the...

A recently developed technique for reconstructing approximately two-dimensional (∂/∂z≈0), timestationary magnetic field structures in space is applied to two magnetopause traversals on the dawnside flank by the four Cluster spacecraft, when the spacecraft separation was about 2000 km. The method consists of solving the GradShafranov equation for magnetohydrostatic structures, using plasma and m...