Skip to comments.The sun may have a dimmer switch
Posted on 01/30/2007 5:41:49 AM PST by DaveLoneRanger
There's a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years exactly the same period as between ice ages on Earth. So says a physicist who has created a computer model of our star's core.
Robert Ehrlich of George Mason University in Fairfax, Virginia, modelled the effect of temperature fluctuations in the sun's interior. According to the standard view, the temperature of the sun's core is held constant by the opposing pressures of gravity and nuclear fusion. However, Ehrlich believed that slight variations should be possible.
He took as his starting point the work of Attila Grandpierre of the Konkoly Observatory of the Hungarian Academy of Sciences. In 2005, Grandpierre and a collaborator, Gábor Ágoston, calculated that magnetic fields in the sun's core could produce small instabilities in the solar plasma. These instabilities would induce localised oscillations in temperature.
Ehrlich's model shows that whilst most of these oscillations cancel each other out, some reinforce one another and become long-lived temperature variations. The favoured frequencies allow the sun's core temperature to oscillate around its average temperature of 13.6 million kelvin in cycles lasting either 100,000 or 41,000 years. Ehrlich says that random interactions within the sun's magnetic field could flip the fluctuations from one cycle length to the other.
These two timescales are instantly recognisable to anyone familiar with Earth's ice ages: for the past million years, ice ages have occurred roughly every 100,000 years. Before that, they occurred roughly every 41,000 years.
Most scientists believe that the ice ages are the result of subtle changes in Earth's orbit, known as the Milankovitch cycles. One such cycle describes the way Earth's orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100,000 years. The theory says this alters the amount of solar radiation that Earth receives, triggering the ice ages. However, a persistent problem with this theory has been its inability to explain why the ice ages changed frequency a million years ago.
Wait a minute.
That is science used to debunk a liberal idea.
I'm just so confused.......
Wonder if the sun could have anything to do with our current climate changes. Strike that comment, I do not wish to be branded a global warming-denier by the ministry of misinformation.
I am not looking forward to the day when those of us who deny anthropogenic global warning will have to walk around with yellow suns pinned to our clothes.
I see a global warming Inquisition where we unfaithful will have to swear under pain of torture that we acknowledge belief in the holy religion of global warming.
...and the internet
Clothes, what clothes? We'll be stripped of them, just like global warmingists want to strip meteorologists of their titles if they don't buy global warming. Okay, so I'm exaggerating just a leetle...
I read a NASA report on here this week that global warming is taking place on Mars at the same time it does here on earth. So its a Solar system warming caused by the Sun. Boy this will surely dissapoint the folks wanting to blame us horrible people!
No, no, no. Global Warming is NOT a religion, it is simply one cannon of the religion known as secular humanism. In secular humanism, everything bad that happens is Man's fault (I mean Bush's fault), and everything good that happens is thanks to nature except that good things almost never happen, it's all bad and we're all going to die horribly unless we cede all power to the small cabal of high priests of secular humanism.
Politicians and global-warming scientists have dimmer switches, too. Too bad all of their bulbs have burned out!
The Mars Rover is responsible. Even though it is electric.
Dr Heidi Flice of The Weather Channel is talking names and writing in her little black book..
Politicians and global-warming "scientists" have dummy switches.......these switches are activated with the crainio-rectal inversion they all suffer from....
I say it's all Bushes fault, because Howard dean radiates excessive heat during all his "hate Bush" tirades.
That are always stuck on stupid.
So, who pushes this dimmer switch then?
"scientists", If it wasn't for them, the world would be humorless.
Scientist- a person who crafts unprovable theories in order to recieve money from government, simular to an "artist" (see Artist- a person who recieves money from the government to create worthless objects, which are then sold to the government)
I wouldn't hang a hat on this one until there's a lot more experimentation and verification. The dangers of spurious correlation loom large.
They say if you believe in Global Warming then we have to reduce our emissions, drive smaller cars etc.
I think that the planet is warming naturally, I think it did so in Roman times and in the Medieval warming period. I think it's a natural and normal event.
So I believe in a Natural Global Warming. I do not believe in Human-Induced Global Warming. It's high time that the differences were highlighted, the HIGW crowd are using the temps as evidence of our involvement, if you try to prove them wrong we have a problem getting our voice heard.
We've got to show that there is a difference between NGW and HIGW.
I think that only one or two of the 1930s years are still in the top 10 warmest years.
And it's only due to changes on Mars, not the Sun.
Should be possible? Of course. Everything fluctuates some.
This article is likely to offend both the enviro-fundamentalists and the young-earth creationsits, and that's a good thing.
"NOBODY EXPECTS THE GLOBAL WARMING INQUISITION!!!"
I agree. If the earth is warming, it's warming. You can't argue that. It's the cause and what to do about it. I say *natural* and *enjoy*.
What a name ... Attila "Great Peter". One has to think he's got a movie-making business on the side....
Heidi Cullen also has a "black book" and it is, of course, geared toward "screwing everybody".
ATILLA Grandpierre. Sounds like a guy who'd make movies with somebody like Stacy Staxx....
IOW, in layman's terms, global warming and bglobal cooling are cyclical.
IOW, in layman's terms, global warming and global cooling are cyclical.
It has been hypothesized that this was a consequence of the loss of agricultural activity engaged in by the Indians, and that, by itself, was causing the Earth to cool.
Certainly not a Disney character........!....
Indeed, I think Stacy Staxx is not out of his reach....
Actually the thermostat is located in a secret lab at Halliburton. Cheney put in the call to Halliburton to have the thermostat turned up. Bush had nothing to do with it. He's just a puppet. Cheney is really running the show.
I don't really need a sarcasm tag, do I?
Real science always debunks "liberal" beliefs.
Politicized/agendized "science" with the intent of securing grant money or furthering the cause of socialism supports "liberal" beliefs.
So you're saying that science always supports "conservative" beliefs, or some other kind of beliefs, instead?
Sorry, but that's far too simplistic. Liberals aren't always wrong, conservatives aren't always right, and science is not immune from politics, whims, fashions, and human short-sightedness.
Science at its best is like human morality at its best: it's interested in looking for the truth, and is unafraid to admit when it's mistaken.
But there's always that human element involved in science, and it's dangerous to ignore that.
What a stupid article.
In the past, I have seen many posters treat science as if it were incapable of any bias. Every scientist has preconceived notions and biases. The good ones recognize this fact and attempt to eliminate them from their models.
Sorry about my typo.
Heidi Flise made money from her call girl business.
Dr Heidi Cullen makes money as a nation wide media whore, plus she is ugly.
You are right. The reality of the situation is that the Earth is indeed slowly warming - and that the change is natural, NOT anthropogenic. The earth's climate is on the uptick of a (broadly) sinusoidal oscillation that made Greenland green in the 11th Century and made the Thames freeze in the 17th. For the next 200 years or so it will get slightly warmer, and then it will slowly get colder again.
Greenhouse gases have very only a minor part to play in this: CO2 a still more minor part - and anthopogenic CO2 a truly infinitesmal part. Cycles in solar insolation (due to solar variability and the Milankovitch cycle) drive short- and medium- term climate change. The water-vapour greenhouse effect completely dwarfs any CO2 effect but is itself only a minor peturbation: insolation drives climate.
The "frame" in which it does this is determined by the truly long term movement of the continents: e.g. we always have Ice Ages when we have a landmass at a pole and we're in an interglacial period now. But insolation is what governs our climate on the human-historical timescale.
Of course, there are other factors, but Saturn has been experiencing some upper-level atmospheric cooling too...
Besides what seems like common intuition, those other (accumulating) links relate the sun's cycles to climate on earth. I'm sure it's not the only factor, but no one can deny the sun is the crucial element of global warming, and the question is what and how much.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.