EM & Terrestrial Weather Considerations

Question 1

What are the 5 (+1) layers of the atmosphere?

Answer 1

1) Troposphere
2) Stratosphere
3) Mesosphere
4) Thermosphere
5) Exosphere

+1) Ionosphere

Question 2

Regions in the EM spectrum where energy can be fully transmitted are known as…

Answer 2

Atmospheric windows

Question 3

What are the 3 types of atmospheric scattering?

Answer 3

1) Rayleigh
2) Mie
3) Non-selective

Question 4

What 2 things affect the degree of atmospheric refraction?

Answer 4

Atmospheric pressure and air temp

Question 5

A term for variations in strength, position, and polarization of transmitted signals passing through a medium is…

Answer 5

Scintillation

Question 6

Absorption + scattering =…

Answer 6

Attenuation

Question 7

Atmospheric effects (absorption) are HIGHER or LOWER at higher freqs?

Answer 7

Higher

Question 8

Scintillation is HIGHER or LOWER at lower freqs?

Answer 8

Higher

Question 9

The “sweet spot” between scintillation and absorption takes place at UHF, SHF or EHF?

Answer 9

SHF

Question 10

1) Protected comm is best at…
2) Mobile comm is best at…
3) High-capacity comm is best at…

Answer 10

1) EHF
2) UHF
3) SHF