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Amazing lightning photo

  1. Jan 21, 2015 #1

    davenn

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    hi guys
    Had to share this with you .....
    This is amazing, have never seen anything like this before in a lightning discharge ( nor has my mate who photo'ed it)
    My fellow storm chaser Michael, from NE NSW State of Australia took this photo a few days or so ago

    discharge1.jpg

    now a closeup

    discharge2.jpg


    Now tell me that doesn't look like a plasma discharge like you see in those plasma globes ?

    is really outstanding

    Dave
     
  2. jcsd
  3. Jan 21, 2015 #2

    phinds

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    Hm ... I'm thinking some reincarnation of Tesla has a lab down under all that :D
     
  4. Jan 21, 2015 #3
    Nice! Looks like a cute little lightening bolt!
     
  5. Jan 21, 2015 #4

    davenn

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    He may have made a new discovery ?

    thought it worthy of the Physics Forums :)
     
  6. Jan 21, 2015 #5

    Bystander

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    Doesn't look like "elf" or "sprite." Spectacular.
     
  7. Jan 21, 2015 #6

    Borg

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    Very nice Dave. Definitely worthy! :oldsmile:
     
  8. Jan 21, 2015 #7

    Dotini

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    What we are seeing may be a cloud-to-ground "anvil crawler, the horizontal, tree-like, in-cloud lightning discharges whose leader propagation is resolvable to the human eye."
    http://stormhighway.com/types.php

    PS: I have one of those plasma globes - very amusing!
     
  9. Jan 21, 2015 #8

    Bandersnatch

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    If you look very closely, you'll notice Zeus at the end of the discharge.
     
    Last edited: Jan 21, 2015
  10. Jan 21, 2015 #9

    davenn

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    No it doesn't as they are usually much larger and well above the storm, without an associated ( directly assoc.) lightning bolt


    interesting thought but no, this is a cloud to air discharge ... see a little further down the page on that link you gave

    I have seen and or photo'ed several in the past, but none of them exhibited this feature


    yup likewise, great thing to break boredom haha

    cheers
    Dave
     
  11. Jan 21, 2015 #10

    davenn

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    That made me giggle, Bandersnatch :)

    D
     
  12. Jan 24, 2015 #11
    The main plasma stream is much brighter than the tributaries. But at the top, the brightness suddenly stops. It doesn't seem to decrease in brightness proportionally to current. I wonder why not.
     
  13. Jan 24, 2015 #12

    Dotini

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    Upward moving lightning from ground to cloud will often tree out into the clouds as it is seen doing here.
     
  14. Jan 24, 2015 #13

    davenn

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    This isn't from ground to cloud ... its from cloud to clear air ...
    have another look at the link you posted earlier and as I then suggested ... scroll down a little :)

    Dave
     
  15. Jan 24, 2015 #14

    Dotini

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    Looking at the photo, the lower end of the stroke appears to be obscured by clouds. Are we sure it originates in the lower cloud and not the ground? Above the stroke where the lightning trees into blue branches, it is dark. Is that the sky, or the bottom of another cloud? What are those diagonal streaks going from upper left to lower right in the upper right quadrant of the photo?

    Those blue tendrils at the top appear to be mostly discharging into a cloud. The way I see it, this will be upward discharging lightning, either cloud to cloud or ground to cloud, or even intracloud. But not cloud to air.

    cloudtoair2.jpg
    Cloud-to-Air Lightning
    click to enlarge
     
    Last edited: Jan 24, 2015
  16. Jan 24, 2015 #15

    davenn

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    yes, because it would have discharged into the base of the cloud, not gone through and kept going. Also and this is almost the biggest clue
    Its obvious the origin point is in the cloud as you can see the intense light from the origin point. In a ground to cloud, that is not usually seen
    well at least in the 1000's of lighting discharge pics of my own and of others
    And also, there is no lighting (illumination) up of the lower section of the cloud as would happen if the discharge had a path between the cloud and ground ( regardless of the direction)


    Yes the tendrils are heading towards the cloud
    Its an unsuccessful cloud to cloud/intracloud, as the main path ENDS in open air. It just happened to be close enough to the upper part of the cloud to start trying to discharge to the cloud

    Here's a pic of my own of a cloud to air, You can also just see a hint of the downwards part of the discharge from the origin point

    IMGP4984a.jpg


    cheers
    Dave
     
  17. May 20, 2016 #16

    Dotini

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    Last edited by a moderator: May 7, 2017
  18. Jun 16, 2016 #17

    Dotini

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    From today's edition of Spaceweather.com:

    RED SPRITES AND GREEN AIRGLOW:
    Thunderstorm season is underway in the northern hemisphere. That means astrophotographers should point their cameras above the clouds. Thomas Ashcraft did so on June 14th, and he captured two forms of space weather--red sprites and green airglow:

    sprite_strip.png

    "A large jellyfish sprite appeared over a thunderstorm in the western Oklahoma panhandle last evening," says Ashcraft. "It was about three hundred miles away from my observatory."

    "I also caught it in video with very low frequency (VLF) radio emissions, and the parent lightning stroke made a strong pop," he says. Turn up the volume and play the video.

    Possibly triggered by cosmic rays, sprites are a form of upper atmospheric that reach up from the tops of thunderstorms toward the edge of space. Although sprites have been seen for at least a century, most scientists did not believe they existed until after 1989 when sprites were photographed by cameras onboard the space shuttle.

    The "jellyfish sprite" Ashcraft captured is backlit by a band of green airglow. Airglow surrounds our entire planet, fringing the top of the atmosphere with aurora-like color. Although airglow resembles the aurora borealis, its underlying physics is different. Airglow is caused by an assortment of chemical reactions in the upper atmosphere. Auroras, on the other hand, are ignited by gusts of solar wind.
     
  19. Jun 16, 2016 #18
    What a lucky shot, thanks for posting that image.
     
  20. Jul 5, 2016 #19
    Fantastic, ain't mother nature grand?
     
  21. Jul 25, 2016 #20

    Dotini

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    A new model of ball lightning formation which has the advantage of explaining how it can form inside airplanes and pass through windows.

    9941_f228bda69952fa13fe74d09b34e4983b.jpg

    9942_154aa6866aefb6f8d0b722621fa71e83.png

    http://www.nature.com/articles/srep28263
    Figure 1A: Ball lightning model.

    From: Relativistic-microwave theory of ball lightning

    srep28263-f1.jpg
    (a) Microwave bubble model. (b) Relativistic electron bunch generation. In the last leader step, a bunch of runaway electrons emerges from the leader tip, accelerates by electric fields between the leader and ground, and undergoes an avalanche. (c) Coherent transition radiation (CTR) of the electron bunch striking the ground or passing through aircraft skins. γ is the relativistic factor of electrons.
     
  22. Jul 26, 2016 #21

    davenn

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    I have yet to see a photo of ball lightning that couldn't be explained by other processes
    as in that top photo of yours @Dotini

    I was assuming you posted that thinking it was an example of ball lightning ... No
    it's just the bright point where the lightning is leaving the cloud and has seriously overexposed
    the image with its brightness .... seen that a zillion times :wink:

    not saying it doesn't exist ... just cannot figure, when there are so many cameras around these days,
    why lots of examples don't exist

    only other explanation is that it's an extremely rare event


    Dave
     
  23. Aug 1, 2016 #22

    Dotini

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    Edit: It is recommended to examine the "Proton Arc Photo Gallery" link at the bottom of the story. It will be seen that most of the "proton arcs" shown have a tightly braided, ropelike structure.

    From today's edition of space weather.com:

    A MYSTERIOUS FORM OF AURORA: Humans have been watching the aurora borealis for thousands of years, with scientific studies of the phenomenon underway for centuries. Despite all that watching and studying, however, there are still some auroral forms that remain a mystery--namely, the "proton arc." This one appeared over the Grande Cache area of Alberta, Canada, on July 29th:

    protonarc_strip.png

    "As I was driving to the Kakwa river, I saw a purple 'proton arc' crossing the sky from east to west, pulsing and dancing with the Northern lights," says photographer Catalin Tapardel. "Quite a show...."

    Aurora photographers see these structures from time to time--tight ribbons of light, sometimes red, sometimes green, writhing across the night sky. They are commonly called "proton arcs."

    Yet aurora scientists say they probably have nothing to do with protons.

    "My opinion, and I believe the consensus of most aurora scientists, is that these arcs are not proton related, " says Jason Ahrns, a researcher at the University of Alaska Fairbanks, "but I don't know what does cause them."

    "Ordinary auroras we see from the ground and space are caused by electrons precipitating down into the atmosphere," says Dennis Gallagher of the NASA Marshall Space Flight Center. "Protons can cause auroras, too, but they are different. For one thing, proton auroras are brightest in the UV part of the spectrum, invisible to the human eye."

    There is some visible light from proton auroras, but the structures they make are not tight and filamentary, but rather broad and diffuse--"in part because the gyroradius of protons is large," says Ahrns. In other words, massive protons circle around magnetic fields in broad lazy arcs unlike lightweight electrons, which can tightly circle magnetic fields to form narrow structures.

    Ahrns photographed an authentic proton aurora in February 2014: photo. "It appearance matched the description of proton arcs in the scientific literature - 'a dim and diffuse glow' with 'very little structure in the observed brightness' with a total brightness of only a few kiloRayleighs, which is just on the verge of visual threshold (Lummerzheim 2001)."

    So what are the "proton arcs" often photographed by amateur aurora chasers? "I don't know," says Ahrns, "but it is something many of us would like to get to the bottom of!" For more examples of this mystery in the sky, browse the Proton Arc Photo Gallery.
     
    Last edited: Aug 1, 2016
  24. Aug 1, 2016 #23
    Very very cool, this is entirely new for me. I see a lot of auroras but have never come across this phenomena, ironically this photo
    Raymond-J-Stinson-Astro-VIP-Glacier-IMG_3606rs_1442096087.jpg
    was taken about 50 miles from where I live, thanks for sharing the link.
     
  25. Aug 1, 2016 #24

    davenn

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    I have photo'ed only one proton arc that I can recall. Many years ago, back when I lived in southern New Zealand
    and long before the days of digital cameras. I see then coming up in pic's of those that live in auroral viewable areas of southern NZ and southern Australia ( Sadly, I no longer do )

    Another phenomena is one called the picket fence, one that I don't recall having witnessed

    upload_2016-8-2_12-54-1.png
    The Picket Fence Aurora Australis from Tasmania 15th of August 2015
    from Ben Swanson

    video here .....




    cheers
    Dave
     
    Last edited: Aug 1, 2016
  26. Aug 1, 2016 #25
    Totally beautiful, thanks. :thumbup:
     
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