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mcgucken
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When we look at the sun, does light emitted from the edges of the sun have a different wavelength than light emitted from the center of the disk?
You would be referring to the Doppler effect. It would be a simple matter to take the speed of the emitting surface and calculate the Doppler effect. One could confirm by looking at the Doppler shift of emission lines from the edge of the sun rotating toward and the edge rotating away, to which GOD__AM alluded. I don't believe the effect is significant, IIRC.mcgucken said:When we look at the sun, does light emitted from the edges of the sun have a different wavelength than light emitted from the center of the disk?
mcgucken said:When we look at the sun, does light emitted from the edges of the sun have a different wavelength than light emitted from the center of the disk?
Being just gas of increasing density, I don't really know if we can call it (the photosphere) a surface.(?) Also, since the Sun has a differential rotation of about 25 days at the equator and ~29 days at high latitudes, does anyone know (legit question) if we have instruments sensitive enough to measure the very small difference (doppler) between the approaching and receding "edges"? 25 days in a long time for one rotation...Creator said:Yes, and the difference in wavelength (doppler shift) between the eastern to the western solar limb (at the equator) is how we can determine the amount of rotation of the solar surface...
Creator
The Michelson Doppler Imager has a resolution of about 20m/s [compared to the solar equatorial revolution speed of about 2000m/s].Labguy said:...does anyone know (legit question) if we have instruments sensitive enough to measure the very small difference (doppler) between the approaching and receding "edges"? 25 days in a long time for one rotation...
I had always thought that we observed the rotation rate by observing sunspots and convection granules at different latitudes.
The layer of gas in the sun that emits visible light (the photosphere) is relatively thin, and from Earth it looks like a surface.Labguy said:Being just gas of increasing density, I don't really know if we can call it (the photosphere) a surface.(?) .
Light wavelengths are different frequencies of electromagnetic radiation that make up the visible spectrum. They are important to explore from the Sun's surface because they contain valuable information about the Sun's composition, temperature, and activity.
Scientists use specialized instruments, such as spectroscopes, to measure light wavelengths from the Sun's surface. These instruments split the incoming light into different wavelengths and then analyze their intensity and patterns to gather data about the Sun.
Studying different light wavelengths from the Sun's surface allows scientists to understand the processes and phenomena happening on the Sun, such as solar flares and sunspots. It also provides valuable insights into the behavior of other stars in the universe.
The light wavelengths from the Sun's surface are essential for life on Earth. The visible light spectrum, which is a small portion of the overall electromagnetic spectrum, is responsible for photosynthesis in plants and allows humans to see. Other types of radiation, such as ultraviolet and infrared, can also impact life on Earth in both positive and negative ways.
Yes, certain light wavelengths from the Sun's surface, such as ultraviolet and X-rays, can be harmful to living organisms. Fortunately, the Earth's atmosphere acts as a shield and absorbs most of these harmful wavelengths before they reach the surface. However, it is still important to protect ourselves from excessive exposure to these types of radiation.