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#1
October 21st 09, 09:06 AM
posted to rec.radio.amateur.antenna
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Ground antenna?
In message , Szczepan Bialek
writes "Richard Clark" wrote .. . On Fri, 16 Oct 2009 12:27:02 -0700 (PDT), wrote: I think the height of the object relative to it's surroundings, and it's ability to stream mean more than anything. Hi Mark, There's another angle to be observed here. Globally, there is a potential difference between earth and sky that runs to several hundred volts per meter, The Earth has the excess of electrons. The Earth produce the electric field about one hundred volts per meter. In a suuny day the electrons migrate up with the heavy ions (aggregates of H2O molecukes). with a current flow on the order of femtoAmperes per square cM. Not much locally, but for the full surface area of earth it is the electron conveyor belt charging the clouds through dust migration. This "electron conveyor belt" charge the air. Next the air becomes cooler and the condensation take place. Clouds appear. The condensation cause the voltage rise. All types of sparks jump. Under clouds the electric field has the opposite direction and thousands volts per meter. At this potential and current, absolutely everything is a short circuit that penetrates the voltage isoclines raising earth towards the clouds. The high voltagi in the clouds is lowered by the "electron conveyor belt" and the lightning. The "electron conveyor belt" is more effective if the Earth have many sharp needle. So there are the two possibilities: 1. If "The intention is to PREVENT a direct lightning strike," - many sharp needle is used, 2. If the intention is to CATCH a direct lightning strike and conduct a strike to ground - a polished big ball is used. S* In the early days of lightning conductors, I believe that the French didn't like the nasty pointy things which the British had installed. Instead, they decorated theirs with fancy balls at the top - with sometimes disastrous results. -- Ian |
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#2
October 21st 09, 06:02 PM
posted to rec.radio.amateur.antenna
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Ground antenna?
"Ian Jackson" wrote ... In message , Szczepan Bialek writes "Richard Clark" wrote . .. On Fri, 16 Oct 2009 12:27:02 -0700 (PDT), wrote: I think the height of the object relative to it's surroundings, and it's ability to stream mean more than anything. Hi Mark, There's another angle to be observed here. Globally, there is a potential difference between earth and sky that runs to several hundred volts per meter, The Earth has the excess of electrons. The Earth produce the electric field about one hundred volts per meter. In a suuny day the electrons migrate up with the heavy ions (aggregates of H2O molecukes). with a current flow on the order of femtoAmperes per square cM. Not much locally, but for the full surface area of earth it is the electron conveyor belt charging the clouds through dust migration. This "electron conveyor belt" charge the air. Next the air becomes cooler and the condensation take place. Clouds appear. The condensation cause the voltage rise. All types of sparks jump. Under clouds the electric field has the opposite direction and thousands volts per meter. At this potential and current, absolutely everything is a short circuit that penetrates the voltage isoclines raising earth towards the clouds. The high voltagi in the clouds is lowered by the "electron conveyor belt" and the lightning. The "electron conveyor belt" is more effective if the Earth have many sharp needle. So there are the two possibilities: 1. If "The intention is to PREVENT a direct lightning strike," - many sharp needle is used, 2. If the intention is to CATCH a direct lightning strike and conduct a strike to ground - a polished big ball is used. S* In the early days of lightning conductors, I believe that the French didn't like the nasty pointy things which the British had installed. Instead, they decorated theirs with fancy balls at the top - with sometimes disastrous results. Now everywhere are "the nasty pointy things" but most people do not know why and if they PREVENT or CATCH. S* |
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