Thursday - June 19, 2008
Will Cold Solar Storm Chill the Earth?
Don from over at The Further Adventures of Indigo Red emails me that the brainiacs over at NASA have come up with an amazing theory: Solar Activity and Earth’s Temperature are linked! But not exactly in the way you might think.
When the sun has lots of sunspots, there are lots of solar flares. Properly called Solar Coronas, these flares are hundreds, perhaps thousands of times hotter than the surface of the sun itself. They also give off tremendous amounts of X-ray and UV radiation. Pointed straight at us. Oh noes!!!
X-rays and ultraviolet radiation from the solar corona affect Earth and its atmosphere. For satellites, this can be a real drag--literally. As Earth’s atmosphere gets hotter, it expands and becomes denser at high altitudes. When this happens, satellites experience more drag, which changes their orbits. Accurately predicting this “space weather” gives satellite operators more time to respond to or avert problems that could potentially cause interruptions and outages.
In order for scientists to build realistic models of the corona, they “must understand coronal heating. It’s the root cause of all this radiation,” says Klimchuk.
Naturally, as scientists, they are required to say “But more study is necessary!!” which translates into Normal as “We want more grant money!!”
Interestingly, at this very moment in time, the sun has but one little sunspot. BUT, and this might be significant, instead of a Coronal Loop, right now the sun has a Coronal Hole. Which is the exact opposite kind of thing. And that thing is pointed right at us! Oh noes? No, oh yesss!!!
coronal hole
A region of the Sun’s corona that appears dark in pictures taken with a coronagraph or during a total solar eclipse, and that shows up as a void in X-ray and extreme ultraviolet images. Coronal holes are of very low density (typically 100 times lower than the rest of the corona) and have an open magnetic field structure; in other words, magnetic field lines emerging from the holes extend indefinitely into space rather than looping back into the photosphere. This open structure allows charged particles to escape from the Sun and results in coronal holes being the primary source of the solar wind and the exclusive source of its high-speed component.
Why could this be good news? Because right now the Earth is caught up in the solar wind from this, but it’s a COLD wind. And one very very low in X-rays and UV, far lower than the sun’s normal output.
So, does that mean the weather will be a bit colder for the next couple of weeks? Beats me. But it’s nearly chilly here today.
Credit: Hinode X-ray Telescope
Posted by Drew458
on 06/19/2008 at 06:47 PM
Filed Under: • Climate-Weather • Space •
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