Tag: sun
A Dalton Minimum Repeat is Shaping Up
Apropos my post yesterday on the sunspot cycle: A Dalton Minimum repeat is shaping up.
Apropos my post yesterday on the sunspot cycle: A Dalton Minimum repeat is shaping up.
The Sun is blank
For the first time since October 10, and only the third time since August, the Earth-facing side of the Sun is blank, showing no sunspots. All told, 2010 has only been blank 13% of the time, for a total of 46 blank days, with only 12 days left in the year. These numbers contrast sharply with 2009, when the Sun was blank 71% of the time, or 260 out of 365 days.
It is very clear that the solar minimum is now over, and that the Sun ramping up to its next maximum. Blank days should soon cease (today might very well be the last for years), and the number of sunspots should continue to increase through approximately 2013, when astronomers now expect the maximum to peak.
It will be a weak maximum, however, likely accompanied with cold weather. At least, this has been the pattern for the last ten centuries, based on the best data that scientists have. When the Sun produces sunspots, the Sun gets hotter, and though that increase in radiation appears slight, it seems enough to warm the Earth’s climate. This is what appears to have happened around the year 1000, during what climate scientists call the Medieval Warm Period.
And when the Sun goes blank, or produces fewer sunspots, the Sun dims, and the Earth’s climate cools. This is what happened in the 1600s and 1700s, when the Little Ice Age gripped much of the Earth. It also happened in the first two decades of the 1800s, the last time the Sun produced as few sunspots as it is now, and when at least one year was called “the year without a summer”. Interestingly, that cold period at the beginning of the 1800s was also a period of intense volcanic activity, which threw a lot of dust and material into the atmosphere and thus helped contribute to the cooling of the Earth.
The last half of the 20th century, however, has not seen that much volcanic activity, which has made the atmosphere today clearer than any time in the past five decades. It has also been a time of increased solar activity, with most of the solar maximums peaking at generally higher numbers. No wonder scientists have detected evidence of a slight warming in the climate.
However, that warming appears to be ending, and it is doing so at the same time the Sun is going spotless. Though we don’t yet fully understand the mechanics of how these two events are linked, it behooves us to pay close attention. No climate prediction or computer model will mean anything if it does not.
Meanwhile, solar scientists remain unclear about the causes behind the solar cycle’s ebbs and flows. They have a reasonable idea that the cycle is caused by the Sun’s magnetic dynamo as it flips from one polarity to another. But why this happens is still subject to debate.
More importantly, it remains a complete unknown how long the next sunspot minimum will be. The Sun could spring back to life, as it did in the 1850s, producing lots of sunspots. Or sunspots might fade out for a few additional decades, as they did in the 1600s.
Sadly, based on the state of our science today, this is a question that probably no one will be able to answer — until we actually see it happen.
Global Eruption Rocks the Sun
The November sunspot graph – still low and below expectations
NOAA’s Space Weather Prediction Center today published its monthly update of the Sun’s developing sunspot cycle (see below). The graph shows the slow rise in sunspots (blue/black lines) in comparison with the consensis prediction made by the solar science community in May 2009 (red line).
As I noted last month, the rise in sunspots as we ramp up to the next solar maximum has definitely slowed, which indicates clearly that we are heading towards the weakest solar maximum in more than two centuries. And as I have noted repeatedly on this website as well as on the John Batchelor Show, that means very cold weather!
University of Colorado and NASA Research Center to Study Sun’s Effects on Earth’s Climate
Progress! The University of Colorado and the Goddard Space Flight Center are forming a collaborative research center to study the Sun’s effect on the Earth’s Climate.
Progress! The University of Colorado and the Goddard Space Flight Center are forming a collaborative research center to study the Sun’s effect on the Earth’s Climate.
Spanish woman claims ownership of the Sun
Then again, this is taking land ownership a bit too far: Spanish woman claims ownership of the Sun.
Then again, this is taking land ownership a bit too far: Spanish woman claims ownership of the Sun.
The Making of a Mind-Blowing DIY Sun Photo
A do-it-yourself photo of the Sun that looks as good as any taken from space. And it’s art too!
A do-it-yourself photo of the Sun that looks as good as any taken from space. And it’s art too!
The updated monthly sunspot graph, as of November 2, 2010
NOAA’s Space Weather Prediction Center today published its monthly update of the Sun’s developing sunspot cycle, showing the slow rise in sunspots in comparison with the consensis prediction made by the solar science community in May 2009.
Unlike October graph, which showed a clear jump in sunspot activity, this November update shows that the rise in sunspot numbers has once again slowed down. As I’ve noted repeatedly, these numbers suggest that we are heading for the weakest solar maximum in two hundred years, far below predictions. And when that last happened, around 1810, it was called the Dalton minimum and the Earth experienced one of its coldest periods in many many decades.
Sunspots return to the Sun
After a three day stretch of blankness, a new sunspot has appeared on the Sun. The question remains: Have we now seen the last blank day for the just ending solar minimum?
After a three day stretch of blankness, a new sunspot has appeared on the Sun. The question remains: Have we now seen the last blank day for the just ending solar minimum?
The Sun was brighter when it was dimmer?
The science is settled? According to one scientist’s data, the Sun actually brightened in visible wavelengths during the ramp down from solar maximum to minimum in 2004-2007 — the exact opposite to what was expected — while dropping in the ultraviolet four times more than predicted.
The science is settled? According to one scientist’s data, the Sun actually brightened in visible wavelengths during the ramp down from solar maximum to minimum in 2004-2007 — the exact opposite to what was expected — while dropping in the ultraviolet four times more than predicted.
The October 2010 sunspot graph
Yesterday NOAA’s Space Weather Prediction Center published its October monthly graph, showing the sun’s developing sunspot cycle in comparison with the consensis prediction made by the solar science community in May 2009.
Sunspot activity in September clearly jumped, though it still remains far below predictions. Prepare for the weakest solar maximum since the 1810s!
Note also that today the Sun is blank, with no sunspots, the first time this has happened since August. At that time I speculated that this might “be the last time the Sun will be blank for years as it continues to ramp up to its next solar maximum.” Obviously not. The question now is whether today will be the finale in blankness for this minimum.
The state of the Sun, September 30, 2010
Time to update the state of the Sun, as seen by satellite data (the last update was in July). The graph below, posted today by Physikalisch- Meteorologisches Observatorium Davos (PMOD), shows the variation in the Sun’s Total Solar Irradiance since 1978. I have added a blue horizontal line to show that even now, two years after the Sun reached the lowest point in its most recent solar minimum, it has still not brightened enough to equal the lowest point in the two previous minimums. (Note that if we included the minimum from 1976, the Sun would still be below that as well.)
Once again, the evidence is building that the Sun might be heading towards the weakest maximum seen to two centuries. And when that happened, things got very cold on Earth.
Birthplace of the Sun?
In a preprint [pdf] posted today on the astro-ph website, astronomers outline the discovery of a star more like a twin of the Sun than any previously discovered. The star is located in the galactic star cluster M67, 3000 light years away. The similarity is so close that the scientists even speculate that the Sun itself might have formed in this same cluster, 4.5 billion years ago. Key quote from paper:
The similarity of the age and overall composition of the Sun with the corresponding data of M67, and in particular the agreement of the detailed chemical composition of the Sun with that of M67-1194, could suggest that the Sun has formed in this very cluster. According to the numerical simulations by Hurley et al. (2005) the cluster has lost more than 80% of its stars by tidal interaction with the Galaxy, in particular when passing the Galactic plane, and the Sun might be one of those. We note that the orbit of the cluster encloses, within its apocentre and pericentre, the solar orbit. However, the cluster has an orbit extending to much higher Galactic latitudes, presently it is close to its vertical apex at z = 0.41 kpc (Davenport & Sandquist 2010), while the Sun does not reach beyond z = 80 pc (Innanen, Patrick & Duley 1978). Thus, in order for this hypothesis of an M67 origin of the Sun to be valid, it must have been dispersed from the cluster into an orbit precisely in the plane of the Galactic disk, which seems improbable.
The last sentences above refer to the different orbital inclinations of the galactic orbits of both the Sun and M67. M67’s orbital inclination is far steeper. While M67 is presently about 1350 light years (410 parsecs) above the galactic plane, the Sun’s orbit never takes it more than 261 light years above the plane.
One more point of interest: M67 is a well known object to amateur astronomers, located in the constellation Cancer.
The sun influences the climate, admit the powers-that-be
Will wonders never cease? The sun actually does influence the climate, the powers-that-be admit at last.
Will wonders never cease? The sun actually does influence the climate, the powers-that-be admit at last.
Say goodbye to sunspots?
Say goodbye to sunspots?
Say goodbye to sunspots?
The Sun is blank again
The Sun is spotless again. By this stage in the ramp up to solar maximum, such things should no longer be happening.
The Sun is spotless again. By this stage in the ramp up to solar maximum, such things should no longer be happening.
The September monthly sunspot graph
The Sun continues to show a reluctance to come out of its solar minimum. Today NOAA’s Space Weather Prediction Center published its monthly graph, showing the sun’s developing sunspot cycle in comparison with the consensis prediction made by the solar science community in May 2009. As you can see below, actual sunspot activity remains far below what was predicted by the red line.
As I noted when I posted the July and August graphs, the Sun’s ramp up to solar maximum continues to be far slower and weaker than predicted. After two hundred years of watching a vibrant and strong solar cycle, it appears increasingly likely that we are heading towards some quiet time on the Sun.
More evidence that the solar cycle is changing
A preprint paper published today on the Los Alamos astro-ph website shows further evidence of the decline in the strength of the Sun’s magnetic field over the past ten years. Extrapolated into the future, this data also suggests that the next solar maximum will be the weakest in 200 years, and that the solar maximum after that will have no sunspots at all. You can download the paper here [pdf].
A preprint paper published today on the Los Alamos astro-ph website shows further evidence of the decline in the strength of the Sun’s magnetic field over the past ten years. Extrapolated into the future, this data also suggests that the next solar maximum will be the weakest in 200 years, and that the solar maximum after that will have no sunspots at all. You can download the paper here [pdf].
New sunspots end short blank period on Sun
After a short four day stretch with no sunspots — the first time in months — two new sunspots appeared today. It is very possible that this will be the last time the Sun will be blank for years as it continues to ramp up to its next solar maximum.
After a short four day stretch with no sunspots — the first time in months — two new sunspots appeared today. It is very possible that this will be the last time the Sun will be blank for years as it continues to ramp up to its next solar maximum.
No sunspots, for the first time in months
For the first time in months, the Sun is blank, with no sunspots. This lull should be very temporary, and might very well be the last time we see the Sun so quiet for a long time, as it ramps up to its next solar maximum (even if that solar maximum is very weak).
For the first time in months, the Sun is blank, with no sunspots. This lull should be very temporary, and might very well be the last time we see the Sun so quiet for a long time, as it ramps up to its next solar maximum (even if that solar maximum is very weak).
First solar radiation storm of solar cycle 24
Speaking of the Sun, on August 14 it unleashed the first solar radiation storm of new solar cycle 24.
Speaking of the Sun, on August 14 it unleashed the first solar radiation storm of new solar cycle 24.
Old Media, Old News
The New York Times today published an op-ed outlining the serious dangers we face should the Sun unleash a solar flare or coronal mass ejection of sufficient power to knock out our electrical grids. After describing the horrors of Hurricane Katrina, the author then says
We are similarly unready for another potential natural disaster: solar storms, bursts of gas on the sun’s surface that release tremendous energy pulses.
Now this might be interesting, had it been published in 1988. At that time, the electrical grids used in the U.S. and Canada were very much unprepared for a sudden solar storm. Moreover, the Sun at that time was ramping up towards a particularly active solar maximum. The result: On March 13, 1989, the power grid that supplied electricity to Quebec and 200 utility companies in the U.S. came crashing down, overloaded by a power surge caused by a burst of energy sent hurtling towards the Earth, by the Sun.
However, to report this threat today as if it was news is somewhat laughable. Since the 1990 solar maximum, the world’s electrical systems have been very much aware of the problem and have instituted numerous safeguards should the Sun burp at them again. It was for this reason that there were few problems during the next solar maximum in 2001, even though it was almost as powerful as the maximum in 1990.
The real news story concerning the Sun is how inactive it has been, for reasons scientists do not understand. Not only was the recently concluded solar minimum the longest and deepest in almost a hundred years, the subsequent solar activity leading to the next solar maximum has been far weaker than every prediction. At the moment, the Sun appears headed for the weakest solar maximum in two hundred years. And when that last happened, the Earth experienced a period of significantly cold weather, also for reasons that scientist do not yet understand.
It is this story that journalists should be covering.
Sloppy journalism from the BBC
Though solar scientists have discovered that certain recent solar behavior might help explain the long and deep solar minimum that just ended, this BBC article immediately tries to give that result credit for explaining everything. To quote:
Solar physicists may have discovered why the Sun recently experienced a prolonged period of weak activity.
NOT! The result only observed a change in solar behavior beneath the surface, whereby the meridional flow slowed down as well as lengthened significantly into the high latitudes, and that this change occurred at the same time as the weak solar minimum. The paper made no attempt to explain why this happened, nor did it provide a theoretical explanation for how these changes resulted in a weak solar minimum.
Finally, and far more important, scientists still have no good theory for explaining the solar cycle in the first place. “We think it’s the solar dynamo [that causes the solar cycle],” noted Dean Pesnell of the Goddard Space Flight Center when I interviewed him for my Sky & Telescope article, What’s Wrong with Our Sun? (August 2009). “But we don’t undertand how the dynamo works, as yet.”
The BBC should be more careful in how it reports a story like this.
A possible cause of extended solar minimum proposed
Scientists think they have discovered at least one cause of the recent long and deep solar minimum: a change in how plasma near the surface of the Sun flows from the equator to the pole, sinks, and then flows back to the equator. In the last minimum, this meridional current flowed much slower, while also flowing much closer to the pole before finally sinking.
Scientists think they have discovered at least one cause of the recent long and deep solar minimum: a change in how plasma near the surface of the Sun flows from the equator to the pole, sinks, and then flows back to the equator. In the last minimum, this meridional current flowed much slower, while also flowing much closer to the pole before finally sinking.
The August monthly sunspot graph
Waking up is hard to do. Today NOAA’s Space Weather Prediction Center once again published its monthly graph, showing the progress of the sun’s sunspot cycle in comparison with the consensis prediction made by the solar science community in May 2009.
As I noted when I posted the July graph, the data continues to show that the Sun’s ramp up to solar maximum is far slower and weaker than predicted, despite the stories this week about how Sunday’s coronal mass ejection demonstrates that the sun is “waking up.”
Northern light show
That coronal mass ejection thrown out by the Sun on Sunday is expected to energize the aurora tonight and again on Thursday. Look up at night if you live in the high northern latitudes.
That coronal mass ejection thrown out by the Sun on Sunday is expected to energize the aurora tonight and again on Thursday. Look up at night if you live in the high northern latitudes.
Two predictions of the next solar maximum
Two new predictions of the upcoming solar maximum were published today on the Los Alamos astro-ph preprint webpage. Both call for a weak solar maximum, with one expecting a sunspot number of 92 at maximum while the other predicting a number of 72.
Two new predictions of the upcoming solar maximum were published today on the Los Alamos astro-ph preprint webpage. Both call for a weak solar maximum, with one expecting a sunspot number of 92 at maximum while the other predicting a number of 72.
CME heading to Earth
Duck! The Sun has unleashed a coronal mass ejection towards the Earth.
Duck! The Sun has unleashed a coronal mass ejection towards the Earth.
Themis satellites transferred to Moon
Two NASA probes, originally launched to study the Sun and having completed their mission, have had their orbits adjusted so that they can study the Moon instead.
Two NASA probes, originally launched to study the Sun and having completed their mission, have had their orbits adjusted so that they can study the Moon instead.