The layer of the atmosphere that is bombarded with rays from the sun is the thermosphere.

Here's why:

* Thermosphere: This layer is characterized by extremely high temperatures due to the absorption of solar radiation. This layer is where the International Space Station orbits, and it's also where auroras occur.

* Other Layers: While other layers of the atmosphere are also exposed to solar radiation, the thermosphere is the most directly affected.

Let me know if you have any other questions!