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Physicists Create Great Balls of Fire

dylanduck writes "Talk about having fun at work. These guys have created luminous clouds of ball lightning up to 20 centimetres across and lasting up to half a second, longer and more realistic than before. There's a cool video too. They say it may even help understand how to contain the plasmas needed for nuclear fusion."

23 of 87 comments (clear)

  1. Let me be the first to say by $RANDOMLUSER · · Score: 4, Funny

    Goodness Gracious!

    --
    No folly is more costly than the folly of intolerant idealism. - Winston Churchill
    1. Re:Let me be the first to say by mnemonic_ · · Score: 5, Funny

      -1 Flamebait.

  2. Video? by ironwill96 · · Score: 4, Informative

    The video is more of a 19 second slideshow of 6 pictures. I was hoping to see an actual high-speed video of the event not a "video" of pictures.

    --
    "To strive, to seek, to find, and not to yield." - Tennyson
    1. Re:Video? by dorbabil · · Score: 2, Insightful

      Considering that TFS says that the balls only lasted 1/2 a second (something a lot of my fellow /.ers are probably familiar with), a live video wouldn't be very interesting. 6 seconds of nothing, then a brief flash, then 6 more seconds of nothing.

    2. Re:Video? by eric_brissette · · Score: 2, Insightful

      I think the point is that 3.7mb for 6 webcam quality photos is kind of rediculous.

    3. Re:Video? by ironwill96 · · Score: 3, Insightful

      Note the statement I made about hoping for a "high speed" video. Haven't you ever seen those videos of a bullet smashing through an apple? Let me assure you that occurs in half a second and yet is more of a video than what they showed.

      --
      "To strive, to seek, to find, and not to yield." - Tennyson
    4. Re:Video? by Tx · · Score: 2, Insightful

      Yes, it's kind of surprising. Ultra-high speed cameras (>1 million frames per second) can typically only take a handful of pictures. However for something lasting a third of a second, a regular high speed video camera (there are plenty that can do several thousand fps) would be ideal, you'd get hundreds of frames of this event.

      Maybe they were having trouble with the initiation of the event, and running at low framerate/long duration to make sure they captured the event at some point.

      --
      Oh no... it's the future.
    5. Re:Video? by Tx · · Score: 4, Informative

      Pointlessly late reply, but for the benefit of anyone stumbling on this thread in the future:

      Modern ultra high speed cameras of at least one type (the type with which I'm very familiar) consist of several effectively separate digital still cameras looking down the same optical axis via a beamsplitter. Special image intensifiers are used on each still camera module to provide "shuttering" and coincidently to amplify the light enough to get a decent picture at the ridiculously short exposure times used. In order to achieve frame rates of up to 1 billion frames per second (yes, billion), and exposures down to a few hundred picoseconds, a pulse is applied to each of the image intensifiers in rapid sequence. Although the exposure times may be less than a nanosecond, the captured image glows on the phosophor screen for many milliseconds, plenty of time to capture it on the CCDs.

      Film-based cameras involving a rapidly spun reel as mentioned in the parent aren't capable of speeds of more than a few thousand fps. However film-based cameras involving a rapidly rotating mirror and a stationary loop of film can achieve frame rates in the millions.

      --
      Oh no... it's the future.
  3. weapons by mikesd81 · · Score: 2, Interesting

    This could be a potential weapon of the future. The beginning of the phasers.

    --
    That which does not kill me only postpones the inevitable.
    1. Re:weapons by AntEater · · Score: 4, Funny

      "This could be a potential weapon of the future..."

      Ah! Now that's the way to get your research funded. Forget about applying for NSF grants. Could my research potentially kill someone? If so, let the DOD fund it. No worries.

      --
      Alex, I'll take keybindings not used by Emacs for $400....
  4. That's great by audj · · Score: 3, Interesting

    But what do they really know about any of this? The article says all of this was created in a lab inside a glass tank. That doesn't seem representative of a real world environment. The lightning strikes were also altered so that they would last much longer than a normal flash.

    Can someone tell me how playing Zeus is going to help nuclear technology?

    1. Re:That's great by AchilleTalon · · Score: 2, Informative
      Maybe you should have read more carefully the article. The whole thing is about plasma, which is ionized gas at high temperature. And if you know a little bit about what is going on at ITER you should now understand any advance in plasma behavior knowledge maybe useful to the nuclear fusion experiments and hopefully future commercial reactors.

      This has nothing to do with the nuclear reaction itself, but rather than with the mean the nuclear reaction is triggered into a torus-shaped plasma. One of the great challenges is to produce a self-sustained plasma. Since, this Zeus-like experiment seems to prove there is a way to produce a self-sustained plasma for much more long times than it is possible right now in all other fusion experimental reactors, this single thing may lead to significant advances in the nuclear fusion industry if well understood and applicable to plasmas produced inside Tokamak-like devices.

      Hope this helped you to better understand the link between these apparently unrelated two things.

      --
      Achille Talon
      Hop!
  5. No, not really. by Valdrax · · Score: 2, Insightful

    The idea of a self-contained plasma bolt speeding through an atmosphere is just silly. What holds the pocket of plasma together against the wind? I just don't see a high-speed projectile application in the technology's future.

    --
    If it's for-profit but free, you're not the customer -- you're the product (e.g., the Slashdot Beta's "audience").
    1. Re:No, not really. by Half+a+dent · · Score: 2, Interesting

      Would need more mass (fuel) and velocity for this added mass? Perhaps it comes down to the launcher device for plasma packets (what would you call plasma rounds?) - either some form of gauss gun (a bit too sci-fi) or using compressed air - a really nasty surprise for your opponents if you took it paintballing!

      We seem to want to spend a fortune on developing new ways of killing each other when there are plenty of tried and tested methods - guess that's where the research money tends to be although I would prefer civil applications for most technology myself.

  6. Ah yes, Science by GroeFaZ · · Score: 3, Funny

    They say it may even help understand how to contain the plasmas needed for nuclear fusion.

    Almost the best excuse to have fun, second only to reproduction.

    --
    The grass is always greener on the other side of the light cone.
  7. Dad was a Bush Pilot by Jah-Wren+Ryel · · Score: 4, Interesting

    A bazillion years ago my father was a bush pilot up in Alaska. He had more than a few stories about ball lighting inside the planes he piloted - sometimes lasting for many seconds, rolling up and down the passenger/cargo areas. Maybe they were tall tales meant to impress us kids, but he wasn't usually one to exaggerate.

    --
    When information is power, privacy is freedom.
  8. Maybe it's all the Sci-fi by thoughtlover · · Score: 2

    When I read the article title, I thought of the movie, The Arrival, given all the talk of global warming, lately.

    I recall the balls of fire in the movie were significantly larger and were not lightning/plasma, though.

    --
    No sig for you! Come back one year!
  9. the arcane by bjackz0r · · Score: 5, Funny

    So it's taken us this long to do what level 5 wizards were doing eons ago? I'll be impressed when they can aim these things accurately at orcs.

  10. Ball lightning experience by euthman · · Score: 2, Interesting

    As a skeptic, I have tended to dismiss reports of natural ball lightning, but I must say that I experienced something that appeared similar. When I was a teenager (in the 1960s), I was playing my electric guitar in the living room, when the electrical transformer on the utility pole in front of the house was struck by lightning and exploded in yellow fire. I perceived a white light from behind, and when I turned around, there was an impossibly bright shiny ball of blue-white light sitting right in front of the amplifier speaker. It lasted for less than a second and quickly faded, leaving the amp unscathed and completely functional (after household current was eventually restored).

    I wasn't doing any drugs either. ;)

    --
    Ed Uthman, MD
    Pathologist, Houston/Richmond, TX, USA
  11. These Physicists are Pretty Slow by Morosoph · · Score: 2, Informative

    People have been producing ball lightning in microwave ovens for years!

  12. I expected more from the article . . . by millisa · · Score: 3, Insightful

    The fact that the video is a bunch of screenshots where you only see the ball lightning in 2-3 of them has already been mentioned . . . But, they claim it lasts .3 seconds, and even using non-high-speed film at 27-ish fps, we should have gotten a good 8-9 frames . . .

    Some of the statements in the article bug me too. They say it must not be hot because we put a piece of paper over it and it didnt catch fire! Er, I can hold a match under a piece of paper for .3 seconds and it wont catch fire either... How about "We measure it with a digitial thermometer and it was 39 degrees celsius, much cooler than expected!". I'm sorry, but I think our little minds can handle a number like that if we can handle .3 seconds...

    The statement in the article that bugged me the most, which I think is just bad writing was: "Most accounts describe a hovering, glowing, ball-like object up to 40 centimetres across, ranging in colour from red to yellow to blue and lasting for several seconds or in rare cases even minutes." Ranging from Red to Yellow to Blue eh? So they are not . . black? If you range from any of the 3 primary colors to the other 3, don't you about cover everything that isn't a shade of grey and outside of our vision?

    If it was on cnn.com I guess I could let it slide since this'd be closer to their norm, but a site dedicated to science articles? Come on . . .

  13. Damn by steve_bryan · · Score: 2, Informative

    Damn, damn, damn, damn. As soon as I clicked post I realized I had committed the hilarious mistake of making a classic spelling error while correcting the spelling of someone else. Of course the correct spelling is misspell which looks ridiculous but is correct. I only spell check for words that feel unfamiliar since I get so many false positives otherwise. I suppose that might be the case for the original poster. Anyhow I apologize and go fix some coffee to see if that improves my acuity.

    p.s. But I'm right that there is some sort of conspiracy to misspell the word ridiculous

  14. Tesla by Martin+Marvinski · · Score: 2, Insightful