What is the cause of short-term radio blackouts?

1. A Coronal mass ejections
2. B Sunspots on the solar equator
3. C North-oriented interplanetary magnetic field
4. D Solar flares

What is indicated by a rising A-index or K-index?

1. A Increasing disturbance of the geomagnetic field
2. B Decreasing disturbance of the geomagnetic field
3. C Higher levels of solar UV radiation
4. D 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?

1. A Transequatorial
2. B Through the auroral oval
3. C Sporadic-E
4. D NVIS

What does the value of Bz (B sub z) represent?

1. A Geomagnetic field stability
2. B Critical frequency for vertical transmissions
3. C North-south strength of the interplanetary magnetic field
4. D Duration of long-delayed echoes

What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?

1. A Southward
2. B Northward
3. C Eastward
4. D Westward

How does the VHF/UHF radio horizon compare to the geographic horizon?

1. A It is approximately 15 percent farther
2. B It is approximately 20 percent nearer
3. C It is approximately 50 percent farther
4. D They are approximately the same

Which of the following indicates the greatest solar flare intensity?

1. A Class A
2. B Class Z
3. C Class M
4. D Class X

Which of the following is the space-weather term for an extreme geomagnetic storm?

1. A B9
2. B X5
3. C M9
4. D G5

What type of data is reported by amateur radio propagation reporting networks?

1. A Solar flux
2. B Electric field intensity
3. C Magnetic declination
4. D Digital-mode and CW signals

What does the 304A solar parameter measure?

1. A The ratio of X-ray flux to radio flux, correlated to sunspot number
2. B UV emissions at 304 angstroms, correlated to the solar flux index
3. C The solar wind velocity at an angle of 304 degrees from the solar equator, correlated to geomagnetic storms
4. D The solar emission at 304 GHz, correlated to X-ray flare levels

What does VOACAP software model?

1. A AC voltage and impedance
2. B VHF radio propagation
3. C HF propagation
4. D AC current and impedance

Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?

1. A A temperature inversion has occurred
2. B A coronal mass ejection impact or a solar flare has occurred
3. C Transequatorial propagation on 6 meters is likely
4. D Long-path propagation on the higher HF bands is likely