RCAIDE.Library.Attributes.Atmospheres.Earth.US_Standard_1976

US_Standard_1976#

class US_Standard_1976(*args, **kwarg)[source]#

Bases: Atmosphere

Implementation of the 1976 U.S. Standard Atmosphere model.

This class provides a complete implementation of the U.S. Standard Atmosphere (1976), defining atmospheric properties at various altitudes based on empirical data.

fluid_properties#

Air properties object containing gas characteristics

Type:

Air

planet#

Earth properties object containing planetary parameters

Type:

Earth

breaks#
Container for atmospheric property breakpoints
  • altitudearray

    Geopotential altitude points in kilometers, ranging from -2 km to 84.852 km

  • temperaturearray

    Temperature values at break points in Kelvin

  • pressurearray

    Pressure values at break points in Pascal

  • densityarray

    Density values at break points in kg/m³

Type:

Data

Notes

The U.S. Standard Atmosphere 1976 is a model defining atmospheric properties up to 1000 km. This implementation covers the range from -2 km to 84.852 km, which encompasses the primary region of interest for most aircraft operations.

The model divides the atmosphere into layers with different temperature gradients and provides standardized values for Temperature, Pressure, Density, Speed of sound, and Viscosity.

Major Assumptions

  • Hydrostatic equilibrium

  • Perfect gas behavior

  • Homogeneous composition below 80 km

  • Gravity variation with geometric height

References

[1] NOAA, NASA, USAF, U.S. Standard Atmosphere, 1976 (1976). Retrieved December 30, 2024, from https://www.ngdc.noaa.gov/stp/space-weather/online-publications/miscellaneous/us-standard-atmosphere-1976/us-standard-atmosphere_st76-1562_noaa.pdf.

See also

RCAIDE.Library.Attributes.Atmospheres.Earth.Constant_Temperature

Simplified constant temperature model