Typical intesities of electromagnetic spectrum found outside
Typical intesities of electromagnetic spectrum found outside
(OP)
Does anyone know where I can find a chart of intensity vs frequency of electromagnetic radiation that can be found outside for a typical day.





RE: Typical intesities of electromagnetic spectrum found outside
RE: Typical intesities of electromagnetic spectrum found outside
RE: Typical intesities of electromagnetic spectrum found outside
Maximum solar incident radiation levels are well defined, but keep in mind that this would be the maximum. You should be able to find this online.
Going back to the main point, by way of example: If you tune into a very strong international broadcast signal on a certain shortwave frequency, its signal amplitude might be described as "+40 dB over S9" or more. Tune the radio dial to a nearby empty channel and you might be listening to weak background noise at "S0" or less. Each S-unit is approx 6dB, so there's basically a 100+dB range of amplitudes from one radio frequency to the next. 100 dB is ten billion to one power ratio.
RE: Typical intesities of electromagnetic spectrum found outside
TV and Radio stations put out the most RF. The antennas have to be physically high for safe transmission levels to humans, in addition to better aerial coverage. They put out many tens of kilowatts power.
Everything else, even cell towers transmit relatively tiny amounts of power.
RE: Typical intesities of electromagnetic spectrum found outside
RE: Typical intesities of electromagnetic spectrum found outside
RE: Typical intesities of electromagnetic spectrum found outside
The RF spectrum has an incredible range of amplitudes. One could look up the license conditions of AM and FM broadcast stations to see what field strengths are the goal for the coverage area. But the adjacent channels might be more than 100 dB lower in amplitude. 100 dB is ten orders of magnitude.
By way of example, the ratio of the length of a bacteria (~1µm) to the length of a Blue Whale (~30m) is only "75dB" (so to speak, excuse the horrible parallel). So how long is a "typical" lifeform?