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The Sun Shows Signs of Life

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NASA
Monday, Nov 10, 2008

Nov. 7, 2008: After two-plus years of few sunspots, even fewer solar flares, and a generally eerie calm, the sun is finally showing signs of life.

“I think solar minimum is behind us,” says sunspot forecaster David Hathaway of the NASA Marshall Space Flight Center.

His statement is prompted by an October flurry of sunspots. “Last month we counted five sunspot groups,” he says. That may not sound like much, but in a year with record-low numbers of sunspots and long stretches of utter spotlessness, five is significant. “This represents a real increase in solar activity.”

The Sun Shows Signs of Life 1007 strip

Above: New-cycle sunspot group 1007 emerges on Halloween and marches across the face of the sun over a four-day period in early November 2008. Credit: the Solar and Heliospheric Observatory (SOHO).

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  • A d v e r t i s e m e n t

Even more significant is the fact that four of the five sunspot groups belonged to Solar Cycle 24, the long-awaited next installment of the sun’s 11-year solar cycle. “October was the first time we’ve seen sunspots from new Solar Cycle 24 outnumbering spots from old Solar Cycle 23. It’s a good sign that the new cycle is taking off.”

Old Solar Cycle 23 peaked in 2000 and has since decayed to low levels. Meanwhile, new Solar Cycle 24 has struggled to get started. 2008 is a year of overlap with both cycles weakly active at the same time. From January to September, the sun produced a total of 22 sunspot groups; 82% of them belonged to old Cycle 23. October added five more; but this time 80% belonged to Cycle 24. The tables have turned.

At first glance, old- and new-cycle sunspots look the same, but they are not. To tell the difference, solar physicists check two things: a sunspot’s heliographic latitude and its magnetic polarity. (1) New-cycle sunspots always appear at high latitude, while old-cycle spots cluster around the sun’s equator. (2) The magnetic polarity of new-cycle spots is reversed compared to old-cycle spots. Four of October’s five sunspot groups satisfied these two criteria for membership in Solar Cycle 24.

The biggest of the new-cycle spots emerged at the end of the month on Halloween. Numbered 1007, or “double-oh seven” for short, the sunspot had two dark cores each wider than Earth connected by active magnetic filaments thousands of kilometers long. Amateur astronomer Alan Friedman took this picture from his backyard observatory in Buffalo, New York:

The Sun Shows Signs of Life alan friedman1 strip

On Nov. 3rd and again on Nov. 4th, double-oh seven unleashed a series of B-class solar flares. Although B-flares are considered minor, the explosions made themselves felt on Earth. X-rays bathed the dayside of our planet and sent waves of ionization rippling through the atmosphere over Europe. Hams monitoring VLF radio beacons noticed strange “fades” and “surges” caused by the sudden ionospheric disturbances.

Hathaway tamps down the excitement: “We’re still years away from solar maximum and, in the meantime, the sun is going to have some more quiet stretches.” Even with its flurry of sunspots, the October sun was mostly blank, with zero sunspots on 20 of the month’s 31 days.

But it’s a start. Stay tuned for solar activity.

This article was posted: Monday, November 10, 2008 at 5:08 am





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