Kennelly-Heaviside layer

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/kennelly-heaviside-layer

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How high is Kennelly-Heaviside layer?Approximately 90 to 150 kilometers (56 to 93 miles)
2. Who discovered Kennelly-Heaviside layer?1902
3. What is the atmospheric region?Part of the ionosphere, specifically the E region
4. What is the primary reflective frequencies?Medium frequencies (MF) and some high frequencies (HF), notably AM radio
5. How does the Kennelly-Heaviside layer help radio waves travel far?When a radio wave hits the layer, the free electrons wiggle and send the wave back down. This reflection lets the signal go over the horizon, so we can hear radio stations from far away.
6. Why does the layer work better at night?At night, the lower parts of the ionosphere fade away, making the Kennelly-Heaviside layer more dominant and better at reflecting radio waves.

Ionosphere: A shell of charged particles in Earth's upper atmosphere, crucial for radio wave propagation and space weather interactions.
Plasma: An ionized gas consisting of ions and free electrons, exhibiting unique electromagnetic properties.
Skywave Propagation: The bending or reflection of radio waves off the ionosphere, enabling long-distance communication beyond the horizon.
Critical Frequency: The highest radio frequency that will be reflected by a specific layer of the ionosphere at a given time and location.