Solar orbiter detects ion sorting at the solar wind's magnetic boundary

A Southwest Research Institute (SwRI) study using data from the European Space Agency's Solar Orbiter detected ion sorting at the solar wind's magnetic boundary. The study found that particles in the HCS align closely with the Sun's magnetic field, indicating a clear compositional change that is tightly aligned with the magnetic polarity flip. The HCS, a sprawling surface emanating from the Sun, acts as a high-speed pipeline, carrying crucial data from the solar corona into space. The study provides scientists with a better understanding of the origin and composition of the HCS and its relationship with the solar wind. The findings suggest that the HCS is not just a magnetic feature but also linked to how the sun sorts ions in the corona and releases them into the solar wind. The study will help scientists construct more accurate models of how the solar wind affects space weather that can impact the Earth. The Solar Orbiter passed through the HCS at about 26 million miles from the Sun, allowing researchers to study the youngest version of the solar wind ever observed. The study used high-quality field, plasma, and composition instruments to analyze particle behavior in this region. The researchers identified a decrease in the ratio of iron and oxygen ions that lines up closely with the magnetic sector boundary. While this new data does not define the origins of the HCS, it helps set boundaries for future models and theories. The findings offer clear constraints that future models of current sheet formation, solar wind heating, and magnetic connection must satisfy. The study is less about proving any one theory and more about defining what any successful theory has to explain.

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