Corona Definition and 46 Threads

Hey all, new here. Just finished my first wimshurst machine and I’d consider it to be fairly AWESOME! Having a blast so far. The thing is, I believe that given the parameters of my build (# of sectors 24, diameter 11”, etc) I’m not quite getting max voltage possible and I’ve confirmed this at...

I am trying to build an argument against a friend (F) who is presently not an anti-vaxxer, but is heading in that direction when he told me that a friend (FF) of his told him (F) that his (FF’s) doctor told him that his Covid mRNA vaccine caused his lymphoma. Of course, FF either misinterpreted...

In a normal circuit it's easy enough to visualize the path electrons take through a wire. Even considering leakage current in a capacitor, it's easy enough to visualize a large parallel resistance that current "leaks" through. Is there such a way to visualize corona discharge? I get that it...

I am trying to understand the current path for corona. Assuming the corona appears on the high voltage electrode, how are the electrons actually flowing? I understand that with flashover a low resistance current path is created as the air is ionized but what is happening with corona?

My astronomy textbook includes this graph of the temperature of the Sun's Corona versus the distance above the photosphere. It appears to go up from 4,500 K to over 1 million K at 20,000 km above the photosphere. But at what point does it come back down? Or does it not? Does that mean the...

I firmly believe China should give financial reparations to the world for creating and spreading Corona virus.

Particularly I could read this sentence "In the infrared, however, the small dust grains did not act like perfect mirrors and this is what made it easy to distinguish the F-corona from the K-corona". I do not understand it. I could understand a problem in separate E corona from F corona, but K...

Corona has come and it doesn't seem to go away that easily. Why can't modern science find some cure that will prevent so many deaths? Why for example we can't find an antibiotic for this specific virus? What about other approaches(vaccine)? I just wish a cure could be found so we may continue...

Here is a Carl Zimmer article in the NY Times showing some fantastic images of the corona virus. These are mostly computer generated images (pretty common these days) based on cryo-EM (Electron Microscopy) and biochemical/molecular biology type data. They are very well rendered, down to the...

1) Q: Why does lightning strike high and sharp targets like a lightning rod? A: Assuming that there is a massive collection of charge, possibly in clouds of a thunderstorm, trying to get to the ground where there is a pool of the opposite charge through an insulator that is air. I believe this...

This has come up in the press the last few days that they now believe Covid-19 is not just a respiratory disease. This is a very interesting article on it. It explains the virus and how it works. https://www.ucsf.edu/magazine/covid-body

I bought a can of soft drink and was wondering whether I should spray 100% isopropyl on it before putting my mouth on it to drink. I did spray and it smelt bad but I wiped it off and drank the can. Is that unsafe or is it the opposite, safer than drinking without spraying? Would it kill corona...

Do research institutes provide remote internships/ research positions which requires programming ? If yes where is the right forum to find them? I am skilled in data science, machine learning, deep learning and computer vision. I googled but unable to find any right resource.

We know viral infections result in cellular damage while they're replicating in the host cells.. Damage can be cytolytic or cytopathic. I want to know how Sars-cov2 causes such damage? Is it cytopathic or cytolytic? Do they (viruses) kill the host cells or just damage them?

Not another Corona thread surely?...yes but this time it's something positive we can take forward, when it's over. Several posters @Tom O [USER=283516]@davenn and others have made reference to reduced seismic activity due to lock down. That's great for Earth sciences and reduction in RTAs but...

1. are there H2O molecules inside a Corona vírus? If yes, drying the virus kills it? 2. the lipid external layer of the Corona virus acts as a glue that attach the virus to any surface? 3. how much time a Corona vírus survives in the dry air? and in a dry surface?

If oxygen is effective against bacteria virus and cancer why isn't it used against coved-19? DMSO is known to bond with certain substances and could carry HP into the blood stream and kill off COVID-19.

For instance, if you put a big "magnifying glass" above the atmosphere in the shadow of a total solar eclipse thus blocking out light from the "surface of the sun", could you heat an object to a temperature hotter than the surface of the sun? Applying the Second Law, one can't raise the...

The question is: The General Relativity Ideas were confirmed by the position of Mercury by Eddington. How could they be certain that the light deviation was due to gravity rather than the lens effect the Sun's corona may have had? What process was used,if any,to remove the effect of the...

Hi, I have a wirmhurst electrostatic generator and I want to use it to create a corona discharge. My common sense tells me that the metal "shaft", which connects to the metal spheres should lead to significant (electron) leak, since it has a much smaller radius of curvature than said spheres. If...

We know that solar corona is heated up although we don't know yet the mechanism. I was wondering which other type of stars, else than G2, in the main sequence suffer of the same effect? Thank you!

I noticed high frequency (greater than 800khz) corona tends to orientate vertically as if it were a flame with a strong air blower beneath it regardless of electrode positioning. This is not the case for DC and low frequency AC corona. Is there a reason why high frequency corona orientates...

Although I have seen values such as 3 kV/mm for the dielectric breakdown of air, I was curious if there was an analytical or semi-analytical model of the ionization of say N2 under a uniform electric field. I am aware of Peek's law. Am I correct in assuming it is empirical? How might one connect...

The corona is much hotter than the surface of the Sun, contrary what you would naively expect from the heat flow. While plasma waves were long suspected as cause, the mechanism was not well understood. How are these waves produced, and how is their energy converted to heat? Scientists now...

I'm trying to find a formula for the current flowing through a wire that is only undergoing corona discharge into air. The wire is connected to a charged sphere, which provides the voltage. So far, I've just found formulas for certain ionization coefficients and electric fields, but no current...

Homework Statement So as I understand, a negative Corona discharge happens between an electrode/pin/rod and a plane electrode. When the sharper electrode is connected to the negative (DC) plug, electrons concentrate on the tip, when sufficient breakthrough voltage is achieved a discharge...

http://www.blastr.com/2015-11-4/nasa-just-saw-something-come-out-black-hole-first-time-ever Saw this article and thought I'd share :) This is going to be a silly question, I'm sure, but what is the corona of a black hole? I tried to google it, but the first few pages were nothing but articles...

1. Compute the Larmor radius for a typical electron in the K corona.2. , , m=9.11×10-31 kg, q=1.602×10-19 CThe Attempt at a Solution My problem is I don't know where to find the other two values that correspond specifically to the the K corona. Then it becomes a simple plug-and-chug problem...

I was wondering whether there is an actual scientific point of taking ground-based photographs of the Solar corona during total eclipses on Earth. It seems to attract a lot of attention from well equipped amateurs around the world and the pictures of the fine plasma structure surely look great...

There are tons of different explanation for each of them in internet. Could someone please confrim the explanation below which I gathered from different places; If the electrical field in a fluid reaches the fluids dielectrical strenght, dielectric collapses and corona happens, but since the...

I took a picture of the sun on a cloudy day with 2 layers of red cellophane on a normal camera, and edited it on the computer. There is some bright stuff around the sun in the middle. Can this possibly be the corona? :eek:

What's the difference between Corona Discharge and Dielectric Breakdown? For me both stand for the same process, but wikipedia (as many other sites) says they are different. Actually they say corona discharge occurs when the electric gradient is high but not enough to create an electrical...

Hello i have a problem with this question if anyone could help me ,that would be great. Estimate the thermal velocity of particles in the solar corona (take a distance two times the radius of the sun and assume that the particules have only two degrees of freedom), thus the thermal energy is...

...Considering there is NO dielectric breakdown or breaking of glass/dielectric..... Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity? For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage...

In basic, why can we only see the corona sphere during a solar eclipse? Is there a property to the eclipse or sun that causes this?

How does temperature fluctuate from the outer layer of the sun outwards to space? Is there any data or equations modeling this?(I'm not an astronomy or physics student, just interested)

I understand corona discharge in electrostatic situations, but in circuits without capacitors/gaps, I don't understand why it can ever happen (since as far as I know, the electric field is virtually 0 in the air around such a circuit). So why is there corona discharge around high-voltage power...

http://science.nasa.gov/media/medialibrary/2011/12/16/lovejoy_c3_anim2.gif http://spaceweather.com/ <--- archive December 17, 2011 In a rare curiosity of nature, Comet Lovejoy appears to transit the elevated temperatures of the solar corona, laughing off the sizzling encounter, seemingly even...

Does anyone know what current voltage, amps would be required to produce a corona around an electrical wire? I gather that this would also be dependent upon the wire material and size. I have seen photos of this and would like to do reproduce the process. What type of camera may these...

Why is the sun's corona temperature around millions of degrees celsius while the sun's surface is about 6000 degrees celsius? Doesn't that defies the laws of thermodynamics?

I want to photograph the solar corona and I don't know what type of ccd camera I need to purchase. Can anyone please help me?

Last night I watch a show about the birth of our sun on the Science channel. At one point they talked about how it takes thousands of years for the light in the suns core to travel from the center to the Corona "outer shell", and then only 11 minutes for the light to travel from the Corona to...

I've been trying to find out what's the curve for the solar corona luminosity vs distance like. I know that the corona can be practically observed up to 4 solar radii. I also found out that the curve is more or less exponential but I need the actuall equation of the curve. Can anyone help me?

can anyone tell me that how to calculate corona power loss for bundled conductor? I need formulae of it.

It isn't posted here, but my solar corona photo is posted on Space.com today. Format there allows larger size. http://www.space.com/amazingimages/cte.php?guid=42d0a2dc400360.56363193&cat=s

The photosphere is 4500 K The chromosphere is 10000 K The corona is 1,000,000 K The temperature increases as the distance from the core increases. This makes no sense to me. Any ideas? Thanks Nautica