linerbanner.blogg.se - Photosphere

Tripod: Step out of the way before you take photos.

Keep your head down when you take photos.

Monopod: Keep the monopod steady above your head.

You can attach the camera to a monopod, tripod, or helmet to stabilize the camera at 1.20-1.80 m/4-6 ft.

Make sure your phone is fully charged and has enough available memory to store your images.

Acratech Spherical Panoramic Head (Sigma lens only).

Nodal Ninja Ultimate R10 with compact 90° rotator.

Canon 8-15mm f/4L fisheye lens (Canon mount only).

The outward pressure of photons may be a key factor too (I'm not 100% sure on that point). Plasma is a different state of matter than gas and it tends to be much more spread out. The answer, as others have pointed out is due to the high temperature and content that's mostly ionized hydrogen in a plasma state. The gist of your question is, how can the photosphere be so light and almost vacuum like over 500 km thickness under such high gravity (28 earth gravity), and that's a fair question. I just put this out there to show that the pressure and density at the bottom of the photosphere is still low, but not as low as 1 part in 6000 of Earth's surface. 14 psi - 1/100th the pressure on the surface of Earth - but these numbers are terrible and prone to high inaccuracy. 0002 kg/m^3, that's 100 kg or 220 lbs per column, worked out to square inches (PSI).

If you take a 500,000 meter column at the above density. I don't trust the numbers enough to calculate the pressure at the bottom of the photosphere with any accuracy. You could also compare the photosphere to Earth's Mesosphere and the photosphere probably becomes more dense, but no matter how you compare, it's always going to be apples to oranges and rather pointless. It's not clear if that density figure is an average for the entire photosphere or closer to the surface where we can measure, but if we measure the entire Earth's atmosphere, the density of our atmosphere drops significantly (how much depends on where you determine the top of the atmosphere is), but that's a problem, there's no absolute boundary, so comparing density is a futile exercise, but the ratio drops to far less than 6,000 to 1, when you take the density of Earth's entire atmosphere. That's about 1/6,000 (not a millionth) of Earth's atmospheric density at the surface (1.2 kg/m^3).

These numbers are rough approximations of a fluid, not fixed volume, and I'd take them with a grain of salt too, but Wikipedia gives the density of the photosphere as about 2×10−4 kg/m^3. In addition to the two answers above, I'll add that, first, your estimate of a million times seems wrong. And even above that height, gravity will be much higher than even at the current surface of the sun. As it cools, that atmosphere will cool so that it is no warmer than earth's atmosphere, but there will still be a point where the atmosphere is that thin. Its gravity will be hugely strong, but there will still be a top of the atmosphere were it is less than a millionth of earth's atmosphere. But some day the sun will be a white dwarf, about the size of the earth but with not that much less mass than it has now. With the sun, it just so happens that the part of the atmosphere that produces the light we see is close enough to the (imprecisely defined) edge of space that its density has gone down almost to nothing.Ĭertainly, if it were cooler, it would be denser. Similarly, above Jupiter's atmosphere, the gravity is still more than twice that of earth, but there is still vacuum. But yet the ISS is orbiting in the vacuum of space. At the height of the ISS, earth's gravity is around 80% of the gravity at sea level. It does sound natural that a stronger gravity would imply a thicker atmosphere, but no matter how strong the gravity is, there is a point where the atmosphere fades away almost to nothing.

So, shouldn't the density of gases at the photosphere of the sun be comparable to that on the surface of the Earth? You writeīut Solar surface gravity is about 28 times terrestrial surface gravity. I think there is a misconception underlying your question.