Extra exam question E3C04
Subelement E3, RADIO WAVE PROPAGATION· Group E3C
E3C04
What does the value of Bz (B sub z) represent?
- A.Geomagnetic field stability
- B.Critical frequency for vertical transmissions
- C.North-south strength of the interplanetary magnetic field (correct answer)
- D.Duration of long-delayed echoes
WhyBz represents the north-south strength of the interplanetary magnetic field. Bz measures the north-south component and strength of the interplanetary magnetic field carried by the solar wind, a key factor in how efficiently solar wind energy couples into Earth's own magnetic field, answer C. It has nothing to do with geomagnetic field stability as a general concept, isn't a critical frequency measurement, and doesn't describe long-delayed echo duration.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E3C01What is the cause of short-term radio blackouts?
- E3C02What is indicated by a rising A-index or K-index?
- E3C03Which of the following signal paths is most likely to experience high levels of absorption when the A- index or K-index is elevated?
- E3C05What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?
- E3C06How does the VHF/UHF radio horizon compare to the geographic horizon?