What is sky wave communication Why is this mode of propagation restriced to the frequenceies only upto few MHz?

Explanation

### Step-by-Step Solution:

1. **Definition of Sky Wave Communication**:
- Sky wave communication refers to a method of radio wave propagation where radio waves are transmitted from the ground, travel through the atmosphere, and are reflected back to Earth by the ionosphere. This allows for long-distance communication.

2. **Role of the Ionosphere**:
- The ionosphere is a layer of the Earth's atmosphere that is ionized by solar radiation. It acts as a reflector for certain frequencies of radio waves, allowing them to bounce back to the Earth's surface.

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