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Thread: Cosmic Ray Origins

  1. #1
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    Cosmic Ray Origins

    Fraser's article Astronomers Locate the Source of High-Energy Cosmic Rays says, among other things:

    While scientists theorize[d in the past] that cosmic rays originate from many sources... astronomers have theorized that supernova remnants (the after-effects of supernova explosions) are responsible for accelerating them to nearly the speed of light.
    I could see a supernova explosion itself being responsible for accelerating protons to nearly the speed of light, but how is a supernova remnant theorized to do this?
    Everyone is entitled to his own opinion, but not his own facts.

  2. #2
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    It's called diffusive shock acceleration, and the "remnant" involved is the expanding shock wave from the supernova, with its embedded magnetic fields, which can accelerate charged particles to high velocity as they bounce back and forth within the shock front.

    Grant Hutchison
    Science Denier and Government Sponsored Propagandist. Here to help.
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  3. #3
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    Quote Originally Posted by Cougar View Post
    ... I could see a supernova explosion itself being responsible for accelerating protons to nearly the speed of light, but how is a supernova remnant theorized to do this?
    Just as one concrete example, look at the pulsar in the Crab Nebula. It has an intense magnetic field sweeping through an ionized cloud. There are more intense situations out there. Look up "Pulsar Wind Nebula".
    Forming opinions as we speak

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