Definition

1. Noun:
   • The atmospheric layer between the mesosphere and the exosphere: The thermosphere is the region of the Earth's atmosphere directly above the mesosphere and below the exosphere. In this layer, temperature increases with altitude due to the absorption of highly energetic solar radiation.

Usage

• The term "thermosphere" is used in scientific contexts, particularly in meteorology, atmospheric science, and astronomy, to describe a specific, high-altitude layer of a planet's atmosphere.
• It is a singular, countable noun. It is typically preceded by the definite article "the" when referring to this specific layer of Earth's atmosphere (e.g., ).

Examples

• Noun:
  • The International Space Station orbits within the thermosphere.
  • Auroras occur in the lower part of the thermosphere.
  • Temperatures in the thermosphere can reach very high values, but it would feel extremely cold due to the low density of particles.

Advanced Usage

• "The upper thermosphere": Refers to the region of the thermosphere closest to the exosphere.
  • Satellites in low Earth orbit experience drag in the upper thermosphere.
• "Thermospheric heating": Describes the process of temperature increase within this layer.
  • Solar activity is a primary driver of thermospheric heating.

Variants and Related Words

• Thermospheric (adj): Of or relating to the thermosphere.
  • Scientists study thermospheric density to predict satellite trajectories.
• Mesosphere (n): The atmospheric layer directly below the thermosphere.
• Exosphere (n): The outermost atmospheric layer directly above the thermosphere.

Synonyms

• Upper atmosphere: A broader, less precise term that can include the thermosphere and exosphere.
• Ionosphere (n): A region within the upper atmosphere that is ionized by solar radiation. It overlaps significantly with the thermosphere, but the terms are not perfectly synonymous. The ionosphere is defined by its electrical properties, while the thermosphere is defined by its thermal structure.

Related Phrases

• "Enter the thermosphere": To pass into this atmospheric layer.
  • During re-entry, the spacecraft begins to encounter significant heat as it enters the thermosphere.
• "Thermosphere boundary": The lower or upper limit of this layer.
  • The boundary between the mesosphere and the thermosphere is called the mesopause.

Noun

1. the atmospheric layer between the mesosphere and the exosphere