The Model of the Upper Atmosphere of the Earth ( English Upper Atmosphere Model, UAM ) is a global mathematical model of the Earth’s upper atmosphere (mesosphere, thermosphere, ionosphere, plasmasphere and inner magnetosphere).
| Uam | |
|---|---|
| Type of | Geophysics |
| Developer | Murmansk Arctic State University |
| operating system | Windows |
| Site | uamod.wordpress.com |
The model calculates the physical parameters of the upper atmosphere by numerically integrating the equations that formulate the basic physical laws for the near-Earth environment; calculates variations in global distributions of parameters of the Earth’s upper atmosphere at altitudes from 60 to 100,000 km depending on helio-geophysical conditions (time of day, season, levels of solar and magnetic activity, etc.).
Content
Mathematical calculations
Calculated Parameters
The model calculates the following parameters of the Earth’s upper atmosphere:
- Concentrations of the main neutral (O, O2, N2, H) and charged (O2 +, NO +, O +, H +, electrons) components of the Earth’s upper atmosphere;
- The temperature of a neutral gas, ions and electrons;
- Components of the velocity vectors of neutral and charged particles;
- Potential and components of the electric field vector.
Parameter Calculation Method
The program uses several methods of calculation [1] :
- In the base case, calculations are performed by numerical integration of quasi-hydrodynamic equations describing the dynamics of the Earth’s upper atmosphere;
- Using a number of empirical models of the parameters of the thermosphere, ionosphere, and electric fields, or in various combinations of theoretical and empirical models;
- By numerical integration of non-stationary three-dimensional equations of continuity, motion and heat balance for neutral, ion and electron gases, together with the equation for the potential of the electric field;
- Finite difference methods for numerical integration of modeling equations.
Benefits
The model describes the upper atmosphere of the Earth as a single system. The main difference between this global model and others is that it calculates together not only the winds, ionic velocities, densities and temperatures of the thermosphere and ionosphere, but also the parameters of the plasmasphere, high-latitude external ionosphere, internal magnetosphere and electric fields of both magnetospheric and thermospheric ( dynamo) of origin.
The model uses variable steps of integration over coordinates and time, allowing you to vary the spatial and temporal resolutions.
Application
- Investigations of physical processes in near-Earth space.
- Interpretation of geophysical observations.
- The tasks of tele-radio communications and navigation, including the tasks of calculating the delays in the transmission of signals from communication satellites and GPS signals.
- The tasks of taking into account the influence of space weather on the functioning of spacecraft and systems, including the tasks of calculating and correcting satellite orbits, as well as long transmission lines.
See also
- Jacchia (atmospheric model)
- List of atmospheric parameters standard
- Geochemical carbon cycle
- Sky diffuse radiation
- Changing of the climate
- Air pollution
- Ozone layer
- Greenhouse effect
Notes
- ↑ Global numerical model of the Earth’s upper atmosphere . Upper Atmosphere Model .