Electric Corona Clip from YouTube. What am I Seeing?

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Anonymous Poster	Electric Corona Clip from YouTube. What am I Seeing? 02/09/2011 9:14 PM
	Is the way this looks due to the camera? What would I see if I saw this with the naked eye? http://www.youtube.com/watch?v=vuSxngMWR7U&feature=related Thanks for reading. David in Wales.
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#1 Re: Electric corona clip from youtube. What am I seeing? 02/09/2011 9:31 PM
	I'm certain that you are seeing something superimposed on those images. In simple terms I think that this is some faked pictures. I do not see any changes at all in the shadow lines or other highlights off of any other surfaces as these "sparks" happen. With all of those apparently bright white corona "sparks" happening I would expect coincident moving shadow lines and highlights in the pictures. This looks like some early Star Trek or bad 50's era Science Fiction movie special effects. I was briefly considering that some ionizing radiation was directly effecting the film or CCD device to explain the lack of coincident effects but then the lens zoomed and the trickery moved with the image. __________________ "Don't disturb my circles." translation of Archimedes last words
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Anonymous Poster	#2 In reply to #1 Re: Electric corona clip from youtube. What am I seeing? 02/09/2011 9:50 PM
	redfred. I wondered that too. But there are these ones by different posters http://www.youtube.com/watch?v=r8_zeD3YIx8 and this one http://www.youtube.com/watch?v=uxhif0mJXhs
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#3 In reply to #2 Re: Electric corona clip from youtube. What am I seeing? 02/09/2011 11:00 PM
	I looked at three or four different you tube videos with similar effects. All of the videos were either silent or in a foreign tongue so I could not discern what was being said. (Yeah, I'm an American.) Without knowing what were the actual image recording conditions and voltages that were happening at the time all I can say is that they just look either bogus or a poor recreation of a corona glow. The other aspect of these sparks in these videos was that there was no gradation in the sparks. Look at this video and this video of a guy playing with a Tesla coil, the spark tracks have a other hues and intensities than just white. Also these sparks light up the room. __________________ "Don't disturb my circles." translation of Archimedes last words
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Anonymous Poster	#4 In reply to #3 Re: Electric corona clip from youtube. What am I seeing? 02/09/2011 11:11 PM
	redfed I have been looking at this for the last half hour and I think I have it! www.daycor.com sell special cameras that pick up a mix of spectrums. I have not read through their website yet to see exactly whats going on but I am sure this must be our answer. Let me know if you think I am barking up wrong tree.. and thankyou for your posts they are much appreciated. david in wales.
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#5 In reply to #4 Re: Electric corona clip from youtube. What am I seeing? 02/09/2011 11:23 PM
	Yeah, their cameras, designed to pick up early corona effects, would likely make the images that are portrayed. We're seeing normally invisible spectra superimposed on the visible spectrum images. Hmmm, I wonder if they'll be useful at work. Thanks for the heads up. __________________ "Don't disturb my circles." translation of Archimedes last words
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Usbport Guru Join Date: Apr 2010 Location: Trantor Posts: 5363 Good Answers: 647	#6 Re: Electric corona clip from youtube. What am I seeing? 02/10/2011 8:04 AM
	You're seeing what happens when secondary electrons from the coronal discharge ionize air molecules, sometimes even a few feet away from the coronal source. The energy generates a lot of UV as well as visible light (and some heat {IR} too of course). You get a cascading effect, which is what is being seen in these videos. The diagram below helps explain why the blobs of light seem to show up randomly and unrelated to the coronal source. (And I think persistence in the camera's imaging sensor is what causes the blobs to sometimes appear to move with the camera, creating that sense of being faked.) Diagram from Wikipedia: http://en.wikipedia.org/wiki/Corona_discharge#Mechanism_of_corona_discharge __________________ Whiskey, women -- and astrophysics. Because sometimes a problem can't be solved with just whiskey and women.
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34point5 Guru Join Date: May 2010 Location: in optimism Posts: 4050 Good Answers: 130	#7 In reply to #6 Re: Electric corona clip from youtube. What am I seeing? 02/12/2011 11:45 PM
	Nice explanation and yes video cameras do that - GA __________________ There is no sin except stupidity. (Oscar Wilde, Irish dramatist, novelist, & poet (1854 - 1900))
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34point5 (1); Anonymous Poster (2); redfred (3); Usbport (1)

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