Posts Tagged ‘solar activity’
click on the image above, or here, for larger version (well worth doing)
The scene-stealer is that detached prominence [that appears to be a cloud] off to the left. That’s the leftover material ejected from the Sun by an erupting sunspot (you can see other sunspots in the picture as well). The gas is ionized — a plasma — and so it’s affected by magnetic fields. The material follows the magnetic field of the Sun in the explosion, lifting it off the surface and into space. Sometimes it falls back, and sometimes it leaves the Sun entirely. In this case, Alan caught some of the material at what looks like the top of its trajectory.
The beauty of this picture belies its violence and sheer magnitude: the mass of material in a prominence can easily top 10 billion tons! As for size, see that dark elongated sunspot near the base of the prominence, just to the right of the bigger, speckly one? That spot is roughly twice the size of the Earth.
As we raise our SPFs, we might recall that on this date in 1957, a star of a different sort fell when Charles van Doren’s winning streak on the television game show Twenty One came to an end. Van Doren was a young Columbia professor at the time, the scion of a storied family: son of Pulitzer Prize-winning poet and literary critic/teacher Mark Van Doren and novelist and writer Dorothy Van Doren, and nephew of critic and Pulitzer Prize-winning biographer Carl Van Doren. This pedigree, along with an academic resume that included St. Johns, Cambridge, and Columbia and advanced degrees in both astrophysics and English, made him a natural for the broad general knowledge challenge of the quiz show.
And indeed, in January of 1957, Van Doren started a winning run that ultimately earned him more than $129,000 (more than $1 million in 2009 dollars) and made him famous (he graced the the cover of Time on February 11, 1957). His reign ended when he lost to Vivienne Nearing (a lawyer whose husband Van Doren had previously beaten).
Subsequently, allegations were made that Van Doren has cheated; and in 1959, he testified before a House investigatory committee that he had been given questions and answers in advance of the show:
I was involved, deeply involved, in a deception… I asked (co-producer Albert Freedman) to let me go on (Twenty One) honestly, without receiving help. He said that was impossible. He told me that I would not have a chance to defeat Stempel [the long-running champ before Van Doren knocked him off] because he was too knowledgeable. He also told me that the show was merely entertainment and that giving help to quiz contests was a common practice and merely a part of show business. This of course was not true, but perhaps I wanted to believe him. He also stressed the fact that by appearing on a nationally televised program I would be doing a great service to the intellectual life, to teachers and to education in general, by increasing public respect for the work of the mind through my performances. In fact, I think I have done a disservice to all of them. I deeply regret this, since I believe nothing is of more vital importance to our civilization than education.
Vivienne Nearing, host Jack Barry, and Charles Van Doren (source)
In this x-ray photo, the dark arc near the top right edge of the image is a filament of plasma blasting off the surface (NASA, AP Photo)
From Astronomy Now, news of a “coronal mass ejection”:
The Sun appears to have jolted from its deep slumber, blasting tonnes of plasma into interplanetary space on Sunday, which is expected to collide with the Earth within the next 24 hours.
“This eruption is directed right at us, and is expected to get here early in the day on 4 August,” says astronomer Leon Golub of the Harvard-Smithsonian Center for Astrophysics. “It’s the first major Earth-directed eruption in quite some time.”
By the time one receives this missive, the plasma should have come ashore.
.. if indeed, one is able to read this. As The Telegraph reports (via News24):
Scientists have warned that a really big solar eruption could destroy satellites and wreck power and communications grids.
Or maybe not. Solarcycle24, a specialist site, is more circumspect:
There will be a chance for minor geomagnetic storming and a small possibility of major geomagnetic storming at high latitudes.
Which is to say that penguins and polar bears may be in for even-more-vivid-than-usual light shows in their night skies…
As to which prediction is right: well, Dear Readers, if you are reading this…
As we recheck all of our surge protectors, we might recall that it was on this date in 1858 that, after several unsuccessful attempts, the first telegraph line across the Atlantic Ocean was completed– and the world became materially smaller.