Scale Size Estimation of Magnetosheath Jets
Abstract. Transient enhancements in the dynamic pressure, so-called magnetosheath jets or simply jets, are abundantly found in the magnetosheath. After their formation at the bow shock, they travel through the magnetosheath towards the magnetopause. On their way through the magnetosheath, jets disturb the ambient plasma. In this paper, we use multi-point measurements from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission of the motion of ambient magnetosheath plasma responding to the passage of a jet to reconstruct the location of the central axis of that jet, along its propagation direction. This method allows to estimate the spatial distribution of the dynamic pressure within the jet. In addition, the scale size perpendicular to the propagation direction could be estimated for different cross sections. Both dynamic pressure and scale size decrease from the center along the propagation axis towards the rear part.
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