Last Updated: 12/08/2023


Version: 2.0

NRLMSIS 2.0 is an empirical atmospheric model that extends from the ground to the exobase and describes the average observed behavior of temperature, 8 species densities, and mass density via a parametric analytic formulation. The model inputs are location, day of year, time of day, solar activity, and geomagnetic activity. NRLMSIS 2.0 is a major, reformulated upgrade of the previous version, NRLMSISE-00. The model now couples thermospheric species densities to the entire column, via an effective mass profile that transitions each species from the fully mixed region below ~70 km altitude to the diffusively separated region above ~200 km. Other changes include the extension of atomic oxygen down to 50 km and the use of geopotential height as the internal vertical coordinate.


The inputs for the model are:

Year and day

time of day

geodetic altitude from 0 to 1,000 km

geodetic latitude longitude

local apparent solar time

81-day average of F10.7 solar flux

daily F10.7 solar flux for previous day

Daily magnetic index


Output of the model includes:

Helium number density

Oxygen(O) number density

Oxygen (O2) number density

Nitrogen (N) number density

Nitrogen (N2) number density

Argon number density

H Hydrogen number density

total mass density

Anomalous oxygen number density

Exospheric temperature

temperature at altitude


  • Thermosphere

Space Weather Impacts

  • Atmosphere variability (satellite/debris drag)



Code Languages: Fortran


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In addition to any model-specific policy, please refer to the General Publication Policy.