75 lines
3.1 KiB
Markdown
75 lines
3.1 KiB
Markdown
E3C Propagation prediction and reporting: radio horizon; effects of space-weather phenomena
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- [[E3C01]] (D)
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What is the cause of short-term radio blackouts? #card
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- [[A.]] Coronal mass ejections
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- [[B.]] Sunspots on the solar equator
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- [[C.]] North-oriented interplanetary magnetic field
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- [[D.]] Solar flares
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- [[E3C02]] (A)
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What is indicated by a rising A-index or K-index? #card
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- [[A.]] Increasing disturbance of the geomagnetic field
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- [[B.]] Decreasing disturbance of the geomagnetic field
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- [[C.]] Higher levels of solar UV radiation
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- [[D.]] An increase in the critical frequency
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- [[E3C03]] (B)
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Which of the following signal paths is most likely to experience high levels of absorption when the A-index or K-index is elevated? #card
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- [[A.]] Transequatorial
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- [[B.]] Through the auroral oval
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- [[C.]] Sporadic-E
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- [[D.]] NVIS
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- [[E3C04]] (C)
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What does the value of Bz (B sub z) represent? #card
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- [[A.]] Geomagnetic field stability
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- [[B.]] Critical frequency for vertical transmissions
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- [[C.]] North-south strength of the interplanetary magnetic field
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- [[D.]] Duration of long-delayed echoes
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- [[E3C05]] (A)
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What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions? #card
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- [[A.]] Southward
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- [[B.]] Northward
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- [[C.]] Eastward
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- [[D.]] Westward
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- [[E3C06]] (A)
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How does the VHF/UHF radio horizon compare to the geographic horizon? #card
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- [[A.]] It is approximately 15 percent farther
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- [[B.]] It is approximately 20 percent nearer
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- [[C.]] It is approximately 50 percent farther
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- [[D.]] They are approximately the same
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- [[E3C07]] (D)
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Which of the following indicates the greatest solar flare intensity? #card
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- [[A.]] Class A
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- [[B.]] Class Z
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- [[C.]] Class M
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- [[D.]] Class X
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- [[E3C08]] (D)
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Which of the following is the space-weather term for an extreme geomagnetic storm? #card
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- [[A.]] B9
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- [[B.]] X5
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- [[C.]] M9
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- [[D.]] G5
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- [[E3C09]] (D)
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What type of data is reported by amateur radio propagation reporting networks? #card
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- [[A.]] Solar flux
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- [[B.]] Electric field intensity
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- [[C.]] Magnetic declination
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- [[D.]] Digital-mode and CW signals
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- [[E3C10]] (B)
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What does the 304A solar parameter measure? #card
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- [[A.]] The ratio of X-ray flux to radio flux, correlated to sunspot number
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- [[B.]] UV emissions at 304 angstroms, correlated to the solar flux index
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- [[C.]] The solar wind velocity at an angle of 304 degrees from the solar equator, correlated to geomagnetic storms
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- [[D.]] The solar emission at 304 GHz, correlated to X-ray flare levels
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- [[E3C11]] (C)
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What does VOACAP software model? #card
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- [[A.]] AC voltage and impedance
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- [[B.]] VHF radio propagation
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- [[C.]] HF propagation
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- [[D.]] AC current and impedance
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- [[E3C12]] (B)
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Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum? #card
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- [[A.]] A temperature inversion has occurred
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- [[B.]] A coronal mass ejection impact or a solar flare has occurred
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- [[C.]] Transequatorial propagation on 6 meters is likely
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- [[D.]] Long-path propagation on the higher HF bands is likely
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