Users Online Now:
2,019
(
Who's On?
)
Visitors Today:
1,095,282
Pageviews Today:
1,828,742
Threads Today:
745
Posts Today:
13,175
05:56 PM
Directory
Adv. Search
Topics
Forum
Back to Forum
Back to Thread
REPLY TO THREAD
Subject
The FLUFFY MAGNETIC RIBBON NEMESIS of the PLASMA UNIVERSE
User Name
Font color:
Default
Dark Red
Red
Orange
Brown
Yellow
Green
Olive
Cyan
Blue
Dark Blue
Indigo
Violet
Black
Font:
Default
Verdana
Tahoma
Ms Sans Serif
In accordance with industry accepted best practices we ask that users limit their copy / paste of copyrighted material to the relevant portions of the article you wish to discuss and no more than 50% of the source material, provide a link back to the original article and provide your original comments / criticism in your post with the article.
[quote:Anonymous Coward 865798:MV8xMDEzODAwXzE1OTc5Nzk0Xzk3QUNEMkY1] [b]WE HAVE DISCOVERED A STRONG MAGNETIC FIELD JUST OUTSIDE THE SOLAR SYSTEM[/b] http://science.nasa.gov/headlines/y2009/23dec_voyager.htm [b][i]Voyager Makes an Interstellar Discovery 12.23.2009 [/b] + Play Audio | + Download Audio | + Email to a friend | + Join mailing list December 23, 2009: The solar system is passing through an interstellar cloud that physics says should not exist. In the Dec. 24th issue of Nature, a team of scientists reveal how NASA's Voyager spacecraft have solved the mystery. "Using data from Voyager, we have discovered a strong magnetic field just outside the solar system," explains lead author Merav Opher, a NASA Heliophysics Guest Investigator from George Mason University. "This magnetic field holds the interstellar cloud together and solves the long-standing puzzle of how it can exist at all." Right: Voyager flies through the outer bounds of the heliosphere en route to interstellar space. A strong magnetic field reported by Opher et al in the Dec. 24, 2009, issue of Nature is delineated in yellow. Image copyright 2009, The American Museum of Natural History. [larger image] The discovery has implications for the future when the solar system will eventually bump into other, similar clouds in our arm of the Milky Way galaxy. Sign up for EXPRESS SCIENCE NEWS delivery Astronomers call the cloud we're running into now the Local Interstellar Cloud or "Local Fluff" for short. It's about 30 light years wide and contains a wispy mixture of hydrogen and helium atoms at a temperature of 6000 C. The existential mystery of the Fluff has to do with its surroundings. About 10 million years ago, a cluster of supernovas exploded nearby, creating a giant bubble of million-degree gas. The Fluff is completely surrounded by this high-pressure supernova exhaust and should be crushed or dispersed by it. "The observed temperature and density of the local cloud do not provide enough pressure to resist the 'crushing action' of the hot gas around it," says Opher. So how does the Fluff survive? The Voyagers have found an answer. "Voyager data show that the Fluff is much more strongly magnetized than anyone had previously suspected—between 4 and 5 microgauss*," says Opher. "This magnetic field can provide the extra pressure required to resist destruction." Above: An artist's concept of the Local Interstellar Cloud, also known as the "Local Fluff." Credit: Linda Huff (American Scientist) and Priscilla Frisch (University of Chicago) [more] NASA's two Voyager probes have been racing out of the solar system for more than 30 years. They are now beyond the orbit of Pluto and on the verge of entering interstellar space—but they are not there yet. "The Voyagers are not actually inside the Local Fluff," says Opher. "But they are getting close and can sense what the cloud is like as they approach it." The Fluff is held at bay just beyond the edge of the solar system by the sun's magnetic field, which is inflated by solar wind into a magnetic bubble more than 10 billion km wide. Called the "heliosphere," this bubble acts as a shield that helps protect the inner solar system from galactic cosmic rays and interstellar clouds. The two Voyagers are located in the outermost layer of the heliosphere, or "heliosheath," where the solar wind is slowed by the pressure of interstellar gas. Voyager 1 entered the heliosheath in Dec. 2004; Voyager 2 followed almost 3 years later in Aug. 2007. These crossings were key to Opher et al's discovery. Right: The anatomy of the heliosphere. Since this illustration was made, Voyager 2 has joined Voyager 1 inside the heliosheath, a thick outer layer where the solar wind is slowed by the pressure of interstellar gas. Credit: NASA/Walt Feimer. [larger image] The size of the heliosphere is determined by a balance of forces: Solar wind inflates the bubble from the inside while the Local Fluff compresses it from the outside. Voyager's crossings into the heliosheath revealed the approximate size of the heliosphere and, thus, how much pressure the Local Fluff exerts. A portion of that pressure is magnetic and corresponds to the ~5 microgauss Opher's team has reported in Nature. The fact that the Fluff is strongly magnetized means that other clouds in the galactic neighborhood could be, too. Eventually, the solar system will run into some of them, and their strong magnetic fields could compress the heliosphere even more than it is compressed now. Additional compression could allow more cosmic rays to reach the inner solar system, possibly affecting terrestrial climate and the ability of astronauts to travel safely through space. On the other hand, astronauts wouldn't have to travel so far because interstellar space would be closer than ever. These events would play out on time scales of tens to hundreds of thousands of years, which is how long it takes for the solar system to move from one cloud to the next. "There could be interesting times ahead!" says Opher. To read the original research, look in the Dec. 24, 2009, issue of Nature for Opher et al's article, "A strong, highly-tilted interstellar magnetic field near the Solar System." [/i] [/quote]
Original Message
This thread will be devoted to the ideas presented by topics related to the "ALL I CAN SAY, IS THAT SOME OF YOU ARE VERY CLOSE" thread.
I will try and structure much of the information, dissecting out of the thread certain material that I and others deem irrelevant, and updating posts with summaries of pertinent information. That way we can see some of the connections without having to traipse through an entire thread. We can just jump to certain pages if we are curious about a certain phenom.
One thing I want everyone to try and do (when possible) is summarize briefly in laymen terms any highly educated input. If a certain person posts something but doesn't have time to summarize, maybe someone else can summarize with a question to the original poster, "RIGHT?" That way, others won't get drowned in 'over the head' theories or ideas.
PLEASE, if anyone has other suggestions, throw them out. I will try and structure the thread every now and then to keep everyone up to date (kinda like I did on the last one).
Good luck, and may the force be with you
:fluf:
:diebitches:
Pictures (click to insert)
General
Politics
Bananas
People
Potentially Offensive
Emotions
Big Round Smilies
Aliens and Space
Friendship & Love
Textual
Doom
Misc Small Smilies
Religion
Love
Random
View All Categories
|
Next Page >>