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Old 15-January-2008, 12:22 PM
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Nadme Nadme is offline
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Smile Sun: North Pole flyby

NORTH POLE FLYBY: This week, at a pivotal moment in the solar cycle, the ESA/NASA Ulysses spacecraft is flying over the sun's North Pole. The sun's polar regions are central to the ebb and flow of solar cycles, so this is a good time to visit.

http://science.nasa.gov/headlines/y2..._northpole.htm

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Many researchers believe the sun's poles are central to the ebb and flow of the solar cycle. Consider the following: When sunspots break up, their decaying magnetic fields are carried toward the poles by vast currents of plasma. This makes the poles a sort of "graveyard for sunspots." Old magnetic fields sink beneath the polar surface two hundred thousand kilometers deep, all the way down to the sun's inner magnetic dynamo. There, dynamo action amplifies the fields for use in future solar cycles
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One big puzzle revealed by previous flybys is the temperature of the sun's poles. In the previous solar cycle, the magnetic north pole was about 80,000 degrees or 8% cooler than the south. Why should there be a difference? No one knows.

The current flyby may help solve the puzzle because it comes less than a year after a similar South Pole flyby in Feb. 2007. Mission scientists will be able to compare temperature measurements, north vs. south, with hardly any gap between them.
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Old 15-January-2008, 01:13 PM
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Your quote is interesting...
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In the previous solar cycle, the magnetic north pole was about 80,000 degrees or 8% cooler than the south. Why should there be a difference? No one knows.
I wonder what region they are measuring when they get an 80,000 deg. temperature reading?
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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

Last edited by George : 15-January-2008 at 06:29 PM.
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Old 15-January-2008, 04:48 PM
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The radiation zone perhaps. I also wonder what temperature this refers to.
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Old 15-January-2008, 06:45 PM
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Here is their instrument package. 80,000 deg. may be the lowest temperature they can see. [This is the lower corona region, I think.]
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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.
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Old 15-January-2008, 07:31 PM
trinitree88 trinitree88 is offline
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The sun, like all objects feeding on the energy produced in a weak interaction, is subject to parity effects and an asymmetric response to them in a strong magnetic field is not a surprise, but rather a nice confirmation between theory and observation. The surprise would be polar symmetry.
The real kicker would be a slight deviation in the kinematic trajectory of Ulysses, unexplained by classical Newtonian, Keplerian, or even GR effects, induced by an asymmetric neutrino flux...(so far all the solar neutrino measurements have been made pretty much in the plane of the solar system). A first rate theory predicts. If it isn't seen, it sorely weakens my modeling,(back to the drawing board).. but with modern timing devices being so accurate, I'll stick my neck in the guillotine....an unaccounted for trajectory or bust, and free ice cream to the first dozen takers.lol pete.

see;http://scitation.aip.org/getabs/serv...cvips&gifs=yes

and see:http://www.sciencedirect.com/science...96764dc75fd127
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Last edited by trinitree88 : 15-January-2008 at 07:39 PM. Reason: links
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Old 16-January-2008, 02:06 PM
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Originally Posted by trinitree88 View Post
...The real kicker would be a slight deviation in the kinematic trajectory of Ulysses, unexplained by classical Newtonian, Keplerian, or even GR effects, induced by an asymmetric neutrino flux...
I would have guessed that the neutrino flux would be symmetric, and very slightly asymmetric for photon flux. Does the magnetic field variations, or other forces, affect neutrinos? [Perhaps core rotation causes density gradients I haven't considered.]

These are purchase-only links. I would be interested in how you are able to distinguish between instellar and interplanetary impacts. [A separate thread would be appropriate in this case. Perhaps one already exists.]
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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.
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Old 17-January-2008, 07:29 PM
trinitree88 trinitree88 is offline
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I would have guessed that the neutrino flux would be symmetric, and very slightly asymmetric for photon flux. Does the magnetic field variations, or other forces, affect neutrinos? [Perhaps core rotation causes density gradients I haven't considered.]


These are purchase-only links. I would be interested in how you are able to distinguish between instellar and interplanetary impacts. [A separate thread would be appropriate in this case. Perhaps one already exists.]
George. I'll need to read the primary paper carefully..(it's midyear exam time)...and see if the missing factor of 5 dust impacts is because they're inferring the number from trajectory deviations already seen or some other factor. If there's a slow sunward deviation, that corroborates the Pioneer anomaly, and makes for interesting musing. ...and yes, magnetic fields affect the way neutrinos interact. They don't feel the electromagnetic force, only the weak and gravity, and the weak force always responds to magnetic fields. pete.
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Last edited by trinitree88 : 17-January-2008 at 07:33 PM. Reason: clarify
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Old 17-January-2008, 08:34 PM
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Originally Posted by trinitree88 View Post
...and yes, magnetic fields affect the way neutrinos interact. They don't feel the electromagnetic force, only the weak and gravity, and the weak force always responds to magnetic fields. pete.
That is interesting. Am I correct to assume that it isn't the neutrino itself that is affected by a mag field, but the interaction area, if you will, is affected, and indirectly affects the neutrino flux in some proportion to the variation of the mag. field? [I regret that I am weak in this area, and even the pun is poor. ]
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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.
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Old 25-January-2008, 06:38 PM
trinitree88 trinitree88 is offline
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Cool makes you weak in the knees....

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Originally Posted by George View Post
That is interesting. Am I correct to assume that it isn't the neutrino itself that is affected by a mag field, but the interaction area, if you will, is affected, and indirectly affects the neutrino flux in some proportion to the variation of the mag. field? [I regret that I am weak in this area, and even the pun is poor. ]
George. Yes. It's the interaction volume that's affected. The primary experiment was Co-60 beta decays by Madame Wu and Ken Ambler at the National Bureau of Standards. It is so intrinsic that it essentially defines your characterization of what your magnetic field is. Wiki addresses it, and a good paperback read is Martin Gardner's "Mirror Asymmetry and Time Reversed Worlds"....the volume "knows" what the field is. and there is a universal effect in weak interactions, with some effect showing up in some strong interactions,too. pete
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