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Amateur Extra Class (Element 4) • 2024-2028

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Question E3C02

From subelement E3 - E3C

E3C02
Answer: A

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

AIncreasing disturbance of the geomagnetic field
BDecreasing disturbance of the geomagnetic field
CHigher levels of solar UV radiation
DAn increase in the critical frequency