XPost: sci.physics.relativity   
   From: relativity@paulba.no   
      
   Den 23.06.2025 11:56, skrev Stefan Ram:   
   >   
   >    Found this in the internet:   
   >   
   > |Could the displacement of star images near the sun be caused   
   > |by refraction in the atmosphere of the Sun, not by general   
   > |relativity?   
   > |   
   > |No. Long wavelength electromagnetic radio waves are, in fact,   
   > |refracted by the plasma in the solar photosphere, chromosphere   
   > |and corona, but this effect can be accounted for, leaving a   
   > |frequency-independent bending of the amount predicted by   
   > |general relativity.   
   > |   
   > |In 1974-75 a series of radio observations were made of the   
   > |occultation by the sun of the quasars 3C273 and 3C279 by   
   > |astronomers Fomalont and Sramek. The measurements were made at   
   > |2.7 and 8.1 gigacycles. Because refraction from the solar   
   > |corona varies with the square of the observing frequency as   
   > |n^2 - 1, where n is the plasma index of refraction, it is   
   > |possible from a 2-frequency observation to eliminate most of   
   > |the effects caused by refraction in the solar atmosphere.   
   > |General relativity predicts that the 'lensing' of light by a   
   > |gravitational field does NOT depend on the frequency of the   
   > |light, unlike lensing of light by optical means.   
   > |   
   > quoted from the internet.   
   >   
      
   https://paulba.no/paper/Fomalont.pdf   
      
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   Paul   
      
   https://paulba.no/   
      
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