2016-E3C: Radio-path horizon; less common propagation modes; propagation prediction techniques and modeling; space weather parameters and amateur radio
What does the term ray tracing describe in regard to radio communications?
Modeling a radio wave's path through the ionosphere
The process in which an electronic display presents a pattern
Determining the radiation pattern from an array of antennas
Evaluating high voltage sources for X-Rays
What is indicated by a rising A or K index?
Increasing disruption of the geomagnetic field
Decreasing disruption of the geomagnetic field
Higher levels of solar UV radiation
An increase in the critical frequency
Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?
What does the value of Bz (B sub Z) represent?
Direction and strength of the interplanetary magnetic field
Geomagnetic field stability
Critical frequency for vertical transmissions
Duration of long-delayed echoes
What orientation of Bz (B sub z) increases the likelihood that incoming particles from the Sun will cause disturbed conditions?
By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?
By approximately 15 percent of the distance
By approximately twice the distance
By approximately 50 percent of the distance
By approximately four times the distance
Which of the following descriptors indicates the greatest solar flare intensity?
What does the space weather term G5 mean?
An extreme geomagnetic storm
Very low solar activity
Moderate solar wind
Waning sunspot numbers
How does the intensity of an X3 flare compare to that of an X2 flare?
Twice as great
10 percent greater
50 percent greater
Four times as great
What does the 304A solar parameter measure?
UV emissions at 304 angstroms, correlated to solar flux index
The ratio of X-Ray flux to radio flux, correlated to sunspot number
The solar wind velocity at 304 degrees from the solar equator, correlated to solar activity
The solar emission at 304 GHz, correlated to X-Ray flare levels
What does VOACAP software model?
AC voltage and impedance
VHF radio propagation
AC current and impedance
How does the maximum distance of ground-wave propagation change when the signal frequency is increased?
It stays the same
It peaks at roughly 14 MHz
What type of polarization is best for ground-wave propagation?
Why does the radio-path horizon distance exceed the geometric horizon?
Downward bending due to density variations in the atmosphere
Downward bending due to aurora refraction
What might a sudden rise in radio background noise indicate?
A solar flare has occurred
A meteor ping
Increased transequatorial propagation likely
Long-path propagation is occurring
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer