The Relationship between Solar Wind Charge Exchange Soft X-ray Emission and the Tangent Direction of Magnetopause in an XMM–Newton Event

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 exchange (SWCX) event detected XMM–Newton during relatively stable and geomagnetic conditions. The determined an empirical model. Observation results show SWCX intensity gradient tends be magnetopause’s inner boundary, while outer boundary. Therefore, credible assumption or its when reconstructing location. In addition, since these two maxima tend boundaries thickness can also revealed imaging.