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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."

3 of 137 comments (clear)

  1. Poor Wesley... by gzerphey · · Score: 3, Informative

    I'm sorry but did anyone else think of a Kolvoord Starburst?

    http://en.wikipedia.org/wiki/The_First_Duty

    --
    I don't have a microwave. I do, however, have a clock that occasionally cooks shit.
  2. 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.

    --
    Curiosity was framed, Ignorance killed the cat.
  3. 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