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Jim Sinclair

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About Jim Sinclair

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    Work interest in HF radio technology, hobby interest in astronomy.

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  1. Hi Drax Spacex, All you say is true but I was referring to the continuous thermal noise. When a geostationary satellite passes across the face of the sun or within a couple of degrees of that direction the thermal noise is strong enough to swamp out the satellite signal. Jim.
  2. There are a couple of possibilities could be added. Neutrinos from the solar interior to Earth's interior. Heavy neutral particles from the solar wind to all layers of the atmosphere and from Cosmic rays. These are both hard things to measure so we don't know a lot about either of them. Radio noise mainly from the photo-sphere I think. Causes a blackout period for geostationary satellites. Jim.
  3. Hi Christopher S., You report an interesting history. Practical experience learning is rare these days so congratulations! In my case it was a spin-off from dealing with H F radio. In WW11 my father was in the Australian Air-force, he was stationed on a bomber airfield, his job was each morning to go to each plane and re-tune the transmitter and receiver to the day frequency then in the evening go to each plane again and re-tune all to the night frequency. When I was 10 years old I found one of his instruction books in a back shed, it looked interesting. I was in a one teacher primary school in a rural area and a year later the school committee decided to give a book prize to every child (about 25 of us I think). Mine was called, "Foundations of wireless" and it was given, "For being a good trier". It took me most of my high school years to understand it enough to try out practical construction projects. In my later teens I sat for the Amateur Operator's Certificate and passed the exam then it took me about six months to get some equipment working on a relevant amateur band. Home construction was the standard in those days. When I was 23 I got a job with what was then the Australian PMGs Department working on construction and later operation of the Radio Australia Relay Station at Cox Peninsula. I worked for that organization for 21 years started as a technician's assistant and worked up to a senior technician and finally acting as a senior technical officer. For most of that time I had something to do with H F radio of one sort or another. As a sideline I had an interest in astronomy. I have been learning about radio for 67 years and still learning and the effect of the sun on the ionosphere has been part of the learning all that time. Things have changed a bit in that time. Hope this helps, Jim.
  4. Hi KieleMoani, Have a look at cloudiness! In Central Australia the degree of cloud cover very definitely is modified by the position of the moon in its orbit so presumably that is due to some effect on the solar wind. The suggestion would be that the same factors would be affected by variations of the solar wind at its source. I think that aspect of the subject is still fairly wide open for research projects. Good luck, Jim Sinclair.
  5. I think you might be on to something I remember reading about the thermonuclear reaction that the carbon-nitrogen cycle proceeds at lower temperature but its dependence on temperature is related to the 3.5 power. On the other hand the hydrogen - helium cycle requires a higher temperature to get started but its dependence on temperature is related to the 14th power of temp. In the sun the internal temperature is thought to be close to that at which the H-He reaction is taking over from the C-N reaction. All that was in a book called, "A star called 'The Sun'" written by George Gamow some time in about the 1960s I think. The inference is that slight changes in pressure (tidal effects) which will slightly affect temperature will have a much more significant effect on the rate of reaction. Not sure where the trail of effects goes from there. Also the relative tidal effects can be calculated from the mass of the planet and its distance from the sun. The relationship is M/D^2 For numbers referred to Earth the inner planets are:- Mercury 0.369 Venus 1.558 Earth 1 Mars 0.046 Jupiter 11.745 Saturn 1.046 Uranus 0.039 Neptune 0.019 I have noticed over the years that charts of monthly sunspot number appear to have a small periodic variation which seems to have period of about 6 to 8 months (Venus orbit?). This is just from looking over the charts by eye, not an exact mathematical analysis. Keep up the good work, Jim.
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