Question
What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the E region?
Answer Options
- A) 180 miles
- B) 1,200 miles
- C) 2,500 miles
- D) 12,000 miles
Correct Answer: B
Explanation
The E region of the ionosphere is located below the higher F regions. Because the E region is much lower in altitude (around 100km}) than the F2 region, a radio wave refracted by it returns to Earth much sooner.
Assuming a shallow take-off angle, the approximate maximum distance covered in a single E region hop is about 1,200 miles. The E region is most noticeable during the day when it is heavily ionized, and occasionally at night when dense, irregular patches form (known as Sporadic E), which can support surprisingly long-distance VHF contacts.
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