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SPACE WEATHER,
VOL. 7,
S10005,
null PP., 2009
doi:10.1029/2009SW000527
Slow Start to Solar Cycle Tied to Sluggish Interior Stream
Freelance writer for the American Geophysical Union
A slowly moving river of gas meandering deep inside the Sun's interior may be the reason for the paucity of sunspots this year and the late start to the current cycle of solar activity. Sonograms of the Sun's surface reveal that the buried stream is moving much more sluggishly toward the equator than similar streams observed during the previous solar cycle. Such jet stream–like currents typically take 6–8 years to move from the pole of the Sun to the equator as they spiral east to west, explained Frank Hill, a solar physicist with the National Solar Observatory, in Tucson, Ariz. “For this cycle, it's taken one to two years longer,” he said.
Published 29 October 2009.
Citation: (2009), Slow Start to Solar Cycle Tied to Sluggish Interior Stream, Space Weather, 7, S10005, doi:10.1029/2009SW000527.
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