Journal of Space Weather and Space Climate, a link between all the communities involved in Space Weather and in Space Climate

Journal of Space Weather and Space Climate, a link between all the communities involved in Space Weather and in Space Climate

On 30 October 2007, the five THEMIS spacecraft observed the cause and consequence of extreme motion of the dawn flank magnetopause, displacing the magnetopause outward by at least 4.8 R_E in 59 s, with flow speeds in the direction normal to the model magnetopause reaching 800 km/s. While the THEMIS A, C, D, and E observations allowed the determination of the velocity, size, and shape of a large bulge moving tailward along the magnetopause at a speed of 355 km/s, THEMIS B observed the signatures of a hot flow anomaly (HFA) upstream of the bow shock at the same time, indicating that the pressure perturbation generated by the HFA may be the source of the fast compression and expansion of the magnetosphere. The transient deformation of the magnetopause generated field‐aligned currents and created traveling convection vortices which were detected by ground magnetometers. This event demonstrates that kinetic (non‐MHD) effects at the bow shock can have global consequences on the magnetosphere.

Journal of Space Weather and Space Climate, a link between all the communities involved in Space Weather and in Space Climate