Magnetic Reconnection in the Solar Wind: Recent Results

Physics

Scientific paper

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2723 Magnetic Reconnection (7526, 7835), 7513 Coronal Mass Ejections (2101), 7519 Flares, 7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

Magnetic reconnection occurs frequently at thin current sheets in the solar wind and produces exhausts of jetting plasma bounded by back-to-back rotational discontinuities. The exhausts are identified as roughly Alfvenic accelerated plasma confined to field reversal regions that almost always take the form of bifurcated (double-step) current sheets. The exhausts are embedded within the solar wind flow and are convected past a spacecraft on time scales ranging from seconds up to several hours, with time scales less than 100 s being dominant. Near solar minimum reconnection exhausts are swept past Earth at a rate of 40 to 70 events/month, with numerous events being associated with local magnetic field shear angles considerably less than 90 degrees. The exhausts are observed predominantly in the low-speed solar wind or in association with interplanetary coronal mass ejections in plasma predominantly having low proton beta; however, reconnection also occurs in the turbulent, high-speed wind from coronal holes, but less frequently. Multi-spacecraft observations demonstrate that the exhausts often result from prolonged (hours) reconnection at extended (up to at least 4.3 x 106 km) and continuous X-lines.

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