G3A14: Coronal holes: How is long distance radio communication

Q: How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

The correct answer is B: HF communication is disturbed. The correct answer is B: HF communication is disturbed. How long-distance radio communication is usually affected by charged particles from solar coronal holes is that HF communication is disturbed. Coronal holes allow high-speed solar wind to escape, which can cause geomagnetic disturbances that disrupt HF propagation. For amateur radio operators, this means poor HF conditions when coronal holes are active. Understanding this helps explain coronal hole effects.

Updated: Dec 9, 2025 | Source: 2023-2027 Question Pool | Topic: G3A

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How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

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Deep Dive: G3A14

The correct answer is B: HF communication is disturbed. How long-distance radio communication is usually affected by charged particles from solar coronal holes is that HF communication is disturbed. Coronal holes allow high-speed solar wind to escape, which can cause geomagnetic disturbances that disrupt HF propagation. For amateur radio operators, this means poor HF conditions when coronal holes are active. Understanding this helps explain coronal hole effects.

Why Other Answers Are Wrong

Option A: Incorrect. Coronal holes don't improve HF communication - they disturb it. The high-speed solar wind from coronal holes causes geomagnetic disturbances. Option C: Incorrect. Coronal holes don't improve VHF/UHF ducting - they affect HF propagation, not VHF/UHF ducting. Ducting is a different phenomenon. Option D: Incorrect. Coronal holes don't disturb VHF/UHF ducting - they affect HF propagation, not VHF/UHF. The effect is on HF, not VHF/UHF.

Exam Tip

Coronal holes effect = HF communication is disturbed. Think 'C'oronal 'H'oles = 'C'ause 'H'F disturbance. Charged particles from coronal holes cause geomagnetic disturbances that disrupt HF propagation. Not improvement, not VHF/UHF - just HF disturbance.

Memory Aid

Real-World Example

A coronal hole on the Sun allows high-speed solar wind to escape. When this reaches Earth, it causes geomagnetic disturbances that disrupt HF propagation. HF communication becomes difficult or impossible, especially at high latitudes. The disturbance typically lasts for days as the coronal hole rotates across the Sun.

Source & Coverage

Question Pool: 2023-2027 Question Pool

Subelement: G3A

Reference: 2023-2027 Question Pool · G3 - Radio Wave Propagation

Key Concepts

Coronal holes Charged particles HF communication Propagation disturbance

Verified Content

Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G3A topic.