How does solar variability affect the production of HOx and Nox and the tidal drivers of the upper atmosphere?

Theme: Natural & Biological Hazards

Main Supervisor:

Anasuya Aruliah

Physics and Astronomy, UCL

Project Description:

Over the last 15 years the strength of the interrelationship of the lower, middle and upper layers of the Earth’s atmosphere has been recognised. This has largely arisen through huge advances in computing power; and a wealth of satellite and ground-based observations that have been combined into empirical and reanalysis models.

These have allowed weak atmospheric signatures to be identified, and non-linear coupling mechanisms that can magnify these effects to be proposed. UCL have a physics-based model of the middle and upper atmosphere called the Coupled Middle Atmosphere Thermosphere model (CMAT2).

We would now like to implement more recent models of particle precipitation and middle atmosphere chemistry, in recognition of the coupling mechanisms involved. This would improve the spatial and temporal structure of auroral particle precipitation and production of NOx and HOx. Consequently we would have a better representation of the tidal forcing of the upper atmosphere from below.

Policy Impact of Research:

We will contribute to building a UK Whole Atmosphere Model to improve tropospheric weather forecasting and Space Weather prediction by investigating the coupling between the layers of the lower, middle and upper atmosphere.

Space Weather affects, for example, satellite drag and telecommunications.

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