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ESA's Cluster Spacecraft Makes Shocking Discovery

A recent observation by the ESA's Cluster Spacecraft was able to finally prove a 20-year-old theory. "On 24 January 2001, the four Cluster spacecraft were flying at an approximate altitude of 105 000 kilometres, in tetrahedron formation. Each spacecraft was separated from the others by a distance of about 600 kilometres. With such a distance between them, as they approached the bow shock, scientists expected that every spacecraft would record a similar signature of the passage through this region. Instead, the readings they got were highly contradictory. They showed large fluctuations in the magnetic and electric field surrounding each spacecraft. They also revealed marked variations in the number of solar wind protons that were reflected by the shock and streaming back to Sun."

14 of 137 comments (clear)

  1. Long-delayed echoes and magnetosphere shock waves? by Bruce+Perens · · Score: 4, Interesting
    Could a solar near-magnetosphere bow-shock wave be the cause of long-delayed echoes? These are echoes of radio signals that are no multiple of the distances to likely objects. The average ham who is active on HF hears about one a year.

    Bruce

  2. Flight Recorder Captured it by joeflies · · Score: 5, Funny

    Wesley Crusher testified that the squadron was in Diamond Slot formation around Titan.

  3. So.... by Audent · · Score: 5, Funny

    WTF does that mean?

    I am SO not a rocket scientist.

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    I am a leaf on the wind
    1. Re:So.... by eln · · Score: 5, Funny

      I think it means we're going to have to send a tachyon pulse into that thing in order to reverse the polarity and stabilize the anomaly.

    2. Re:So.... by Jarjarthejedi · · Score: 5, Funny

      It means that the Starboard Manifold Coupling may overload due to Heisenberg Waves unless we can patch the Quantum Foam Warp Reactor Sealant before the Borg board us!

      --
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  4. Who else... by Lockejaw · · Score: 5, Funny

    ... didn't have to look up tetrahedron because they roll d4's every weekend?

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    (IANAL)
  5. Re:Who else... by eln · · Score: 5, Funny

    Who else didn't know what a tetrahedron was until the above poster noted that it was the shape of a 4 sided die?

  6. Yeah, but not for 'tetrahedron.' by Kadin2048 · · Score: 5, Insightful

    No; however, I did have to look up bow shock, which frankly I think probably should have been linked in the summary.

    Basically it's the 'wave' that precedes the sun or a planet as it passes through space, somewhat similar to the standing wave that you'd see in front of a big tanker ship going through the water. (Particularly one without a bulbous bow.) Rather than water, it's the solar wind that's being disrupted by the body's passage.

    Neat diagram on Wikipedia, too.

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  7. Uh.. yeah by orclevegam · · Score: 5, Informative

    Well, I understand more or less what the article is about (although they said it in a very long winded way), but I'm thinking unless you're a astrophysicist, are studying particle physics, or possible electro-magnetic phenomena then this is a rather dry article.

    It's my understanding based on the article that what they discovered (or more accurately proved) was that the bow shock produced by the solar wind colliding with earths magnetosphere is not actually a single giant bow shock, but more like a whole bunch of continually reforming bow shocks stacked on top of each other. Of course, I'm not a physicist, so I could be wrong in that interpretation. Also, it doesn't seem as if this discovery has any immediately applicable implications but is more of a hey, that's kind of neat, type thing.

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  8. Re:geek needing moral support by ObjetDart · · Score: 5, Funny
    i love slashdot. i read it 24/7. and my gf just broke up with me

    Coincidence? I think not.

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  9. "highly contradictory" indeed by justthinkit · · Score: 4, Insightful

    "PhysOrg" means Physics, right? Well then, show me the numbers. And probably a graph or two. FFS, since when does "highly contradictory" pass for information?

    Were the differences well within the error bars? I'm going with the latter until someone pastes a link with meat on its bones.

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    I come here for the love
  10. Re:Long-delayed echoes and magnetosphere shock wav by KutuluWare · · Score: 4, Informative
    A comment made near the end of TFA may help explain why it's so "shocking":

    Although the conditions that cause the reformation of a shock wave are rare around the Earth, they are common around these other celestial objects.
    I would interpret this, in context with the rest of the article, to mean that the phenomenon measured by the Cluster doesn't normally happen around Earth. After all, we've been sending spacecraft out past the moon since long before 2001, so these can't be the first to get a chance to measure the region. I believe the point of the article was that these fluctuations were predicted in 1985, but until 2001, none of the measurements of Earth's bow shock supported the theory. The ESA was fully expecting similar readings this time around, but "shockingly" got readings that proved the 20-year-old theory. --K
  11. Re:Who else... by Kohath · · Score: 4, Funny

    That's why they were effected with a bow shock.

    You're supposed to do your saving throws with a 20-sided die. You'll never save against anything with a tetrahedron.

  12. Re:Who else... by ookabooka · · Score: 5, Funny

    and finally: Who knew what a tetrahedron was, but didn't know what a "d4" was until the above poster stated it was a die with 4 sides?

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