B-007-05: Solar activity, sunspots, sunspot cycle
B-007-05-01:
How do sunspots change the ionization of the atmosphere?
The more sunspots there are, the greater the ionization
The more sunspots there are, the less the ionization
Unless there are sunspots, the ionization is zero
They have no effect
B-007-05-02:
How long is an average sunspot cycle?
11 years
17 years
5 years
7 years
B-007-05-03:
What is solar flux?
The radio energy emitted by the sun
A measure of the tilt of the earth's ionosphere on the side toward the sun
The number of sunspots on the side of the sun facing the earth
The density of the sun's magnetic field
B-007-05-04:
What is the solar-flux index?
A measure of solar activity that is taken at a specific frequency
Another name for the American sunspot number
A measure of solar activity that compares daily readings with results from the last six months
A measure of solar activity that is taken annually
B-007-05-05:
What influences all radiocommunication beyond ground-wave or line-of-sight ranges?
Solar activity
The F2 region of the ionosphere
The F1 region of the ionosphere
Lunar tidal effects
B-007-05-06:
Which two types of radiation from the sun influence propagation?
Electromagnetic and particle emissions
Subaudible and audio-frequency emissions
Polar region and equatorial emissions
Infra-red and gamma-ray emissions
B-007-05-07:
When sunspot numbers are high, how is the ionosphere affected?
Frequencies up to 40 MHz or higher are normally usable for long-distance communication
High frequency radio signals are absorbed
Frequencies up to 100 MHz or higher are normally usable for long-distance communication
High frequency radio signals become weak and distorted
B-007-05-08:
All communication frequencies throughout the spectrum are affected in varying degrees by the:
sun
ionosphere
aurora borealis
atmospheric conditions
B-007-05-09:
Average duration of a solar cycle is:
11 years
3 years
6 years
1 year
B-007-05-10:
The ability of the ionosphere to reflect high frequency radio signals depends on:
the amount of solar radiation
the power of the transmitted signal
the receiver sensitivity
upper atmosphere weather conditions
B-007-05-11:
Propagation cycles have a period of approximately 11:
years
months
days
centuries
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● = Incorrect answer
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