The correct option is Due to the absorption of solar radiation by electrically charged particles..
Explanation
The atmosphere is vertically divided into layers based on temperature gradients. The Ionosphere is an overlapping functional layer defined by electrical properties (ionization), situated primarily within the Thermosphere. In this region, the temperature profile shows a distinct increase with altitude, contrasting with the Mesosphere below it.Detailed Analysis
- Due to the presence of the ozone layer. is incorrect: The heating due to the ozone layer occurs in the Stratosphere. Ozone molecules absorb ultraviolet (UV) radiation, causing the temperature to rise in that specific layer, which lies below the Mesosphere.
- Due to the absorption of solar radiation by electrically charged particles. is correct: The Ionosphere and Thermosphere are characterized by low density and the presence of gas molecules that absorb high-energy solar radiation, such as X-rays and extreme ultraviolet (UV) rays. This absorption strips electrons from atoms, creating electrically charged particles (ions). The energy absorbed in this process significantly increases the kinetic energy of the molecules, leading to a sharp rise in temperature with increasing height.
- Due to heat transport from the troposphere. is incorrect: The Troposphere is the lowest atmospheric layer. It is separated from the Ionosphere by the Stratosphere and Mesosphere. Heat transport from the Troposphere is not the mechanism driving the high temperatures in the upper atmosphere.
- Due to the burning of meteors. is incorrect: Meteors primarily burn up in the Mesosphere due to friction with atmospheric gases. While this generates localized heat, it is not the fundamental cause of the sustained temperature increase observed in the Ionosphere/Thermosphere.
Key Takeaway:
The temperature in the Ionosphere (Thermosphere) increases with altitude because gas molecules absorb high-energy solar radiation (X-rays and UV), causing ionization and intense heating.