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Solar wind
speed: 537.8 km/sec
density: 1.4 protons/cm3
A solar wind stream flowing from the indicated coronal hole could brush against Earth's magnetic field on April 10th or 11th. Credit: SDO/AIA.
UNSTABLE FILAMENT: An active filament of solar magnetism is snaking around the sun's southeastern limb today. Measuring more than 200,000 km along its sinuous backbone, the vast structure is in a constant state of motion. NASA's Solar Dynamics Observatory froze it in this snapshot taken 20:16 UT on April 5th:
Filaments as agitated as this one is often erupt and hurl parts of themselves into space. Because of the filament's location on the sun's limb, any such blast would not be Earth-directed, but it would be photogenic! Readers with solar telescopes are encouraged to monitor the action. http://www.spaceweather.com/