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Amateur Extra Class: 2020–2024
Today
Sections
E1: Commission's Rules
E2: Operating Procedures
E3: Radio Wave Propagation
E4: Amateur Practices
E5: Electrical Principles
E6: Circuit Components
E7: Practical Circuits
E8: Signals and Emissions
E9: Antennas and Transmission Lines
E0: Safety
Quick Index
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Element 4
E3
E3C
E3C02
E3C02:
What is indicated by a rising A or K index?
Increasing disruption of the geomagnetic field
Decreasing disruption of the geomagnetic field
Higher levels of solar UV radiation
An increase in the critical frequency
E3C01
E3C02
E3C03
E3C04
E3C05
E3C06
E3C07
E3C08
E3C09
E3C10
E3C11
E3C12
E3C13
E3C14
E3C15