Today NOAA posted its monthly update of the solar cycle, showing the sunspot activity for the Sun in November. As I do every month, I am posting it here, below the fold, with annotations.
As in October, the Sun was more active than it has been for this entire solar maximum. November’s numbers dropped slightly from October, but still remained high, though as has been typical for this solar maximum they remained below prediction.
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Using Solar Dynamics Observatory (SDO), scientists have finally identified the Sun’s predicted giant jet streams.
These large flows, bigger than any flow structures previously identified, might help explain the Sun’s rotation (which is faster at the equator than at the poles), its magnetic field, and its production of sunspots. Not surprisingly, however, the models and data do not match exactly:
Mark Miesch, a physicist at the National Center for Atmospheric Research in Boulder, Colorado, says the new study confirms modelling work he and others have done on giant convective cells4. There are, however, some differences between what the models suggest and what Hathaway’s team observed. For instance, the models indicate that giant cells should align themselves from north to south near the Sun’s equator, an arrangement that isn’t seen in the new data. In fact, points out solar physicist Junwei Zhao of Stanford University in California, most of the giant cells were seen at high latitudes, and they need to be spotted at lower latitudes as well. “Whether it will convince the community remains to be seen,” says Zhao.
The uncertainty of science: A new study suggests that the variation of the cosmic ray flux during the solar cycle has little influence on the climate.
The study seems statistical in nature, which leaves me skeptical. Nonetheless, the link between cosmic rays and climate change remains tenuous, with only one study at CERN providing any evidence that cosmic rays might have an influence.
It is always best to admit when you are wrong as soon as you find out. Last month, in reporting NOAA’s monthly update of the solar cycle, I unequivocally stated that
My interpretation of this data tells me that almost certainly the solar maximum has ended. We might see some later fluctuations whereby the sunspot number jumps, but the Sun is clearly beginning its ramp down to solar minimum.
Well, I spoke too soon. Last night NOAA posted the newest update of the solar cycle, and it shows that in October the Sun was more active then it has been in two years. In fact, for only the second time this entire solar cycle the Sun’s sunspot activity actually came close to matching the predictions of scientists. This month’s graph is posted below the fold, with annotations.
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28 solar flares in the past week.
The sun has erupted more than two dozen times over the last week, sending radiation and solar material hurtling through space – and scientists say more eruptions may be coming.
This shouldn’t be unusual. After all, we are technically at solar maximum, the peak of the 11-year cycle of the sun’s activity. But this has been a noticeably mellow solar maximum, with the sun staying fairly quiet throughout the summer. So when our life-giving star suddenly let loose with 24 medium strength M-class solar flares and four significantly stronger X-class flares between Oct. 23 and Oct. 30, it felt like a surprise.
October was one of the most active months for the sun this solar maximum, and I expect the sunspot count for the month to be quite high as well, more than we’ve seen in two years. I shall have that update in just a few days.
All of these active sunspots have been in the sun’s southern hemisphere, which indicates that hemisphere is finally gearing up to flip its magnetic field, something the sun’s northern hemisphere did last year. Once that happens the solar maximum will be officially over and we will head for the next solar minimum.
This post is really about the monthly NOAA update of the solar cycle, but before I do that, I must note some really bad science journalism in connection with that solar minimum.
This week NASA released a poorly written press release describing how the Sun’s magnetic field flips whenever it goes through solar maximum, the period when sunspot activity reaches its maximum. The article gave the incorrect impression that this “flip” will be some grand singular and spectacular event and when it happens the consequences to Earth could be significant. Then it buried this most important little detail to the article’s final paragraphs:
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Late last night NOAA released its monthly update of the Sun’s sunspot cycle, covering the period of March 2013. As I have done every month for the past three years, I am posting this latest graph, with annotations to give it context, below the fold.
While the Sun’s output of sunspots increased in March, it did not do so with much vigor, with the numbers still far below all predictions while also showing an overall decline since a single strong peak in October 2011.
On February 4, NOAA released its monthly update of the Sun’s sunspot cycle, covering the period of January 2013. As I do every month, I have posted the latest graph, with annotation, below the fold.
Not surprisingly, the sunspot numbers in January showed a recovery and rise from the steep plunge in December. What is surprising, however, is that the rise is not very much, barely bringing the sunspot number for the month back to the weak numbers we’ve seen for most of 2012.
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NOAA today released its newest monthly update of the Sun’s sunspot cycle and, as I do every month, I have posted the latest graph, with annotation, below the fold.
The sunspot numbers for December were not only startlingly low, they actually plunged to levels not seen since May 2011, at a time when the Sun is supposed to be approaching sunspot maximum and the number of sunspots is supposed to be increasing.
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The solar maximum has already occurred in the Sun’s northern hemisphere, according to one scientist’s research.
Moreover, the data also suggests that the maximum in the Sun’s southern hemisphere will not occur until early in 2014. This asymmetry between the hemispheres also suggests the strong possibility of a Grand Minimum to follow.
The uncertainty of science: The solar scientists at the Marshall Spaceflight Center today revised upward their prediction for the upcoming peak of the solar maximum, from a sunspot number of 60 to 76, while simultaneously delaying the arrival of their predicted peak from the spring to the fall of 2013.
Since Marshall does not archive its predictions, I am required to keep track of the revisions they make and note them here. Previously I had outlined the changes in this prediction since January 2011. Here is an updated listing:
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Scientists have found new evidence that the solar sunspot cycle has influenced the Earth’s climate in the recent past.
Sirocko and his colleagues found that between 1780 and 1963, the Rhine froze in multiple places fourteen different times. The sheer size of the river means it takes extremely cold temperatures to freeze over making freezing episodes a good proxy for very cold winters in the region, Sirocko said.
Mapping the freezing episodes against the solar activity’s 11-year cycle — a cycle of the Sun’s varying magnetic strength and thus total radiation output — Sirocko and his colleagues determined that ten of the fourteen freezes occurred during years when the Sun had minimal sunspots. Using statistical methods, the scientists calculated that there is a 99 percent chance that extremely cold Central European winters and low solar activity are inherently linked.
Also this:
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NOAA’s Space Weather Prediction Center today posted its monthly update of the ongoing sunspot cycle of the Sun. As I do every month, I am posting this graph, which you can see below the fold.
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On June 4 NOAA’s Space Weather Prediction Center posted its monthly update of the ongoing sunspot cycle of the Sun. Now that I am back from Nevada, I’ve had a chance to take a look at it, and have posted the new graph for April below the fold.
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Solar scientists at the Marshall Space Flight Center have once again adjusted their prediction for the upcoming solar maximum.
The current prediction for Sunspot Cycle 24 gives a smoothed sunspot number maximum of about 70 in May of 2013. We are currently over two and a half years into Cycle 24. Five out of the last six months with average daily sunspot numbers above 40 has raised the predicted maximum above the 64.2 for the Cycle 14 maximum in 1907. This predicted size still make this the smallest sunspot cycle in over 100 years.
This new prediction is slightly higher than their prediction of 63 from two weeks ago. As they note, even this new number leaves us with a very weak solar maximum.
The solar scientists at the Marshall Space Flight Center significantly downgraded their prediction today for the upcoming solar maximum.
Unfortunately, the Marshall scientists don’t archive their previous predictions, merely changing the text of their webpage periodically. However, I have archived most of these predictions as they have changed. Here they are:
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In a preprint paper published today on the Los Alamos astro-ph website and accepted for publication in the Journal of Atmospheric and Solar-Terrestrial Physics, Norwegian scientists have found a strong correlation between the length of the solar sunspot cycle and the Earth’s temperature during the following cycle. From the abstract:
Relations between the length of a sunspot cycle and the average temperature in the same and the next cycle are calculated for a number of meteorological stations in Norway and in the North Atlantic region. No significant trend is found between the length of a cycle and the average temperature in the same cycle, but a significant negative trend is found between the length of a cycle and the temperature in the next cycle. This provides a tool to predict an average temperature decrease of at least 1.0 ◦ C from solar cycle 23 to 24 for the stations and areas analyzed. We find for the Norwegian local stations investigated that 25–56% of the temperature increase the last 150 years may be attributed to the Sun. For 3 North Atlantic stations we get 63–72% solar contribution. [emphasis mine]
You can download a copy of the paper here [pdf].
Their paper finds that if a particular sunspot cycle is longer with less activity, the climate will show significant cooling during the next cycle.
The paper makes several important points:
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Data issued last week without fanfare by both the UK’s Met Office and the University of East Anglia Climatic Research Unit has confirmed that the rising trend in world temperatures ended in 1997.
The article also discusses at great length the additional influence the sun and its sunspot cycle might have on the climate, something I have discussed here at great length. However, the above factoid is the article’s most important data point.
The solar scientists at the Marshall Space Flight Center have upped their prediction for the next solar maximum, calling for a sunspot number of 99 in February 2013. Their previous prediction called for a maximum sunspot number of 89 in March 2013.
As it does every month, NOAA’s Space Weather Prediction Center today released its monthly update showing the ongoing changes of the Sun’s solar cycle sunspot activity. I have posted the graph below the fold.
For the fourth month in a row the Sun’s sunspot activity has leaped upward. In fact, for the first time since I have been tracking sunspot activity, beginning in 2008, the Sun’s sunspot activity exceeds the predicted activity by a significant amount. Since the end of the previous maximum, the Sun had consistently failed to meet the expectations of solar scientists by producing far fewer sunspots than expected.
In the past few months, however, the Sun has recovered, its activity firing upward, including some of the most active and largest sunspots in years.
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