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Abstract:
We search for simultaneous crossings of the Earth’s magnetosheath (MSH) region from ESA’s Cluster and NASA’s MMS missions. We inspect Cluster summary plots to determine the Cluster-MSH crossings. Then, MMS summary plots are inspected, and the MMS-MSH intervals which overlap in time with the Cluster-MSH intervals, are catalogued. We find 117 simultaneous Cluster and MMS magnetosheath crossings in 2017-2021. We are interested in the correlation between magnetosheath properties and bow shock (BS) characteristics. Thus, for each one of the MSH intervals in our catalogue, we determine the BS type. Depending on the angle between the interplanetary magnetic field (IMF) and the BS normal direction, the bow shock can be classified as either quasi-parallel or quasi-perpendicular. OMNI data are used to determine the IMF orientation, and the BS normal direction is estimated using two different approaches: (1) using the minimum variance analysis of the magnetic field and (2) using a bow shock model parameterized with concurrent OMNI data. We will present our catalogue of simultaneous Cluster and MMS magnetosheath crossings, and discuss our estimates for the BS type associated with each crossing.
