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SOLAR SECTOR BOUNDARY CROSSING UPDATE Boosting the chances of auroras even more is a high-speed solar wind stream waiting on the other side of the heliospheric current sheet. The wind is flowing from a coronal hole on the sun, shown in this extreme UV image from NASA's Solar Dynamics Observatory. Coronal holes are places in the sun's atmosphere where the sun's magnetic field opens up, allowing hot gas to escape. In the image, above, the magnetic field is traced by curved white lines. Arrows show where the solar wind is escaping along open field lines. Forecasters expect the gassy stream to reach Earth on Feb. 28 to March 1. |
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