Question
Which of the following is the space-weather term for an extreme geomagnetic storm?
Answer Options
- A) B9
- B) X5
- C) M9
- D) G5
Correct Answer: D
Explanation
Geomagnetic storms are disturbances in the Earth’s magnetic field, usually caused by coronal mass ejections (CMEs) hitting the magnetosphere. NOAA (National Oceanic and Atmospheric Administration) uses a standardized scale to categorize the severity of these storms, from minor to extreme.
The NOAA Space Weather Scales classify geomagnetic storms using the letter G followed by a number from 1 (minor) to 5 (extreme). Therefore, G5 is the space-weather term that indicates an extreme geomagnetic storm. A G5 storm can cause severe damage to power grids, widespread degradation of GPS and satellite navigation, and prolonged, massive disruption to HF radio communication.
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