# atmoscoesa

Use 1976 COESA model

## Syntax

```[T, a, P, Rho] = atmoscoesa(height, action) ```

## Description

Committee on Extension to the Standard Atmosphere has the acronym COESA. ```[T, a, P, Rho] = atmoscoesa(height, action)``` implements the mathematical representation of the 1976 COESA United States standard lower atmospheric values. These values are absolute temperature, pressure, density, and speed of sound for the input geopotential altitude.

Below the geopotential altitude of 0 m (0 feet) and above the geopotential altitude of 84,852 m (approximately 278,386 feet), the function extrapolates values. It extrapolates temperature values linearly and pressure values logarithmically.

## Input Arguments

`height`

Scalar, vector, or matrix of geopotential heights, in meters.

`action`

Action for out-of-range input. Specify one:

 `'Error'` `'Warning'` (default) `'None'`

## Output Arguments

 `T` Scalar, vector, or matrix of temperatures, the same size as the input height argument, in kelvin. `a` Scalar, vector, or matrix of speeds of sound, the same size as the input height argument, in meters per second. The function calculates speed of sound using a perfect gas relationship. `P` Scalar, vector, or matrix of pressures, the same size as the input height argument, in pascal. `Rho` Scalar, vector, or matrix of densities, the same size as the input height argument, in kilograms per meter cubed. The function calculates density using a perfect gas relationship.

## Examples

Calculate the COESA model at 1000 m with warnings for out-of-range inputs:

```[T, a, P, rho] = atmoscoesa(1000) T = 281.6500 a = 336.4341 P = 8.9875e+004 rho = 1.1116```

Calculate the COESA model at 1000, 11,000, and 20,000 m with errors for out-of-range inputs:

```[T, a, P, rho] = atmoscoesa([1000 11000 20000], 'Error') T = 281.6500 216.6500 216.6500 a = 336.4341 295.0696 295.0696 P = 1.0e+004 * 8.9875 2.2632 0.5475 rho = 1.1116 0.3639 0.0880```

## Compatibility Considerations

expand all

Behavior changed in R2021b

## References

U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C. 