Speaker
Description
Based on in-situ measurements, this study compares two upstream solar wind regimes: at the Lagrange point L1 and near-Earth. We quantify the reliability of the OMNI dataset to represent the solar wind recorded in a near-Earth environment as an input to solar wind-magnetosphere interaction studies. In order to do this we compare the OMNI data with solar wind data directly recorded by spacecraft positioned around the subsolar point. The OMNI data are upstream measurements time-shifted to a model Bow Shock nose location, and are compared with near-Earth THEMIS, MMS, and Cluster solar wind measurements. We analyze (pristine) solar wind data from the start of the respective missions until 2022. We perform a regression analysis of the solar wind identified in the near-Earth missions with the upstream OMNI data and determine the parameter distributions of the near-Earth missions. We provide statistics on the overlap of time series, which we study concerning their similarities in the key solar wind parameters such as velocity, density, and magnetic field orientation. We show the timescales of solar wind that we can expect to be accurately represented by the OMNI dataset. This research underscores the need for integrated multi-point measurements to better understand the drivers of complex dynamics of solar wind-magnetosphere interactions.
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