Deep Dive: E3C08
The correct answer is D: G5. Which of the following is the space-weather term for an extreme geomagnetic storm is G5. Geomagnetic storms are classified G1-G5, with G5 being extreme. For amateur radio operators, this is important for understanding space weather. Understanding this helps when evaluating geomagnetic conditions.
Why Other Answers Are Wrong
Option A (B9): Incorrect. B9 isn't a geomagnetic storm classification - geomagnetic storms are G1-G5. B9 doesn't exist. Option B (X5): Incorrect. X5 is a solar flare classification, not geomagnetic storm - geomagnetic storms are G1-G5. X5 is solar flare. Option C (M9): Incorrect. M9 is a solar flare classification, not geomagnetic storm - geomagnetic storms are G1-G5. M9 is solar flare.
Exam Tip
Extreme geomagnetic storm = G5. Think 'E'xtreme 'G'eomagnetic = 'G'5. Geomagnetic storms are classified G1-G5, with G5 being extreme. Not B9, not X5 (solar flare), not M9 (solar flare) - just G5.
Memory Aid
Extreme geomagnetic storm = G5. Think 'E'xtreme 'G'eomagnetic = 'G'5. Geomagnetic storms are classified G1-G5, with G5 being extreme. Important for understanding space weather.
Real-World Example
Space-weather terminology: Geomagnetic storms are classified G1 (minor) through G5 (extreme). G5 is the space-weather term for an extreme geomagnetic storm. This is different from solar flare classifications (A, B, C, M, X). This is the term - G5 for extreme geomagnetic storm.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E3C
Reference: 2024-2028 Question Pool · E3 - Radio Wave Propagation
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E3C topic.