$LastChangedDate: 27-Juil-2011 $

# CL_mod_expDensity

Exponential density model

## Calling Sequence

       [ro]=CL_mod_expDensity(altitude [,prctl,h_ro])

## Description

- Computes the density value at a given altitude using an exponential model.

  The confidence index is given by the input percentile (prctl). The other parameters of the exponential model (reference density and altitude) are function of the input altitude and prctl values.

## Parameters

altitude:

  Altitude [m]

prctl:

  (optional) Percentile level. Possible values are 1, 5, 33, 67, 95, 99, 100. Default is 100

h_ro:

  (optional) Inverse of scale height (beta) [km^-1]. Default is 0.0153

ro :

  Density [kg/m^3]

## Authors

- CNES - DCT/SB

## See also

- CL_mod_atmUS76

- CL_mod_expDensityDrag

- CL_cw_diffDrag

## Bibliography

- 1) ATV-CC, Technical Note, Mission analysis input data ANNEX (Time, reference frames, conventions and models for mission analysis) [DCT/SB/MS 2004-543]

- 2) Space Station Program Natural Environment Definition for Desing, International Space Station, Alpha (Revision B, February 8, 1994) [SSP 30425 Revision B]

## Examples

    altitude=[350000 360000];
    [ro]=CL_mod_expDensity(altitude)
    [ro]=CL_mod_expDensity(altitude,67,0.0155)
    [ro]=CL_mod_expDensity(altitude,h_ro=0.0155)