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NRLMSISE-00 Atmosphere Model

Implement mathematical representation of 2001 United States Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Exosphere

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  • NRLMSISE-00 Atmosphere Model block

Libraries:
Aerospace Blockset / Environment / Atmosphere

Description

The NRLMSISE-00 Atmosphere Model block implements the mathematical representation of the 2001 United States Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Exosphere (NRLMSISE-00) of the MSIS® class model. This block calculates the neutral atmosphere empirical model from the surface to lower exosphere (0 to 1,000,000 meters). When configuring the block for this calculation, you can also take into account the anomalous oxygen, which can affect the satellite drag above 500,000 meters.

Limitations

Ports

Input

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Geodetic latitudes, in degrees, longitude, in degrees, and altitude, in selected length units, specified as three-element matrix.

Data Types: double

N years, specified as an array.

Data Types: double

N days of a year (1 to 365 (or 366)), specified as an array.

Data Types: double

N seconds in a day, specified as an array, in universal time (UT).

Data Types: double

N local apparent solar timed, specified as an array, in hours.

Data Types: double

N 81-day averages of F10.7 flux, centered on day of year (doy), specified as an array.

Data Types: double

N daily F10.7 fluxes for previous days, specified as an array.

Data Types: double

Magnetic index information, specified as an N-by-7. If you specify magneticIndex, you must also specify f107Average and f107Daily. The magnetic index information consists of:

Daily magnetic index (AP)
3 hour AP for current time
3 hour AP for 3 hours before current time
3 hour AP for 6 hours before current time
3 hour AP for 9 hours before current time
Average of eight 3 hour AP indices from 12 to 33 hours before current time
Average of eight 3 hour AP indices from 36 to 57 hours before current time

The effects of daily magnetic index are not large or established below 80,000 m. As a result, the block sets the default value to 4. It sets all other indices to 0 by default. See the limitations in Limitations for more information.

Data Types: double

Flags, specified as an array of 21, to enable or disable particular variations for the outputs.

FieldDescription
Flags(1)

F10.7 effect on mean

Flags(2)

Independent of time

Flags(3)

Symmetrical annual

Flags(4)

Symmetrical semiannual

Flags(5)

Asymmetrical annual

Flags(6)

Asymmetrical semiannual

Flags(7)

Diurnal

Flags(8)

Semidiurnal

Flags(9)

Daily AP. If you set this field to -1, the block uses the entire matrix of magnetic index information (APH) instead of APH(:,1)

Flags(10)

All UT, longitudinal effects

Flags(11)

Longitudinal

Flags(12)

UT and mixed UT, longitudinal

Flags(13)

Mixed AP, UT, longitudinal

Flags(14)

Terdiurnal

Flags(15)

Departures from diffusive equilibrium

Flags(16)

All exospheric temperature variations

Flags(17)

All variations from 120,000 meter temperature (TLB)

Flags(18)

All lower thermosphere (TN1) temperature variations

Flags(19)

All 120,000 meter gradient (S) variations

Flags(20)

All upper stratosphere (TN2) temperature variations

Flags(21)

All variations from 120,000 meter values (ZLB)

Flags(22)

All lower mesosphere temperature (TN3) variations

Flags(23)

Turbopause scale height variations

Data Types: double

Output

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Temperature values, returned in a N-by-2 array of values, in selected temperature units. The first column contains exospheric temperatures, the second column contains temperature at altitude.

Data Types: double

Density values, returned in a N-by-9 array, in selected density units.

DensityDescription
Density(1)

Density of He

Density(2)

Density of O

Density(3)

Density of N2

Density(4)

Density of O2

Density(5)

Density of Ar

Density(6)

Total mass density

Density(6), total mass density, is defined as the sum of the mass densities of He, O, N2, O2, Ar, H, and N. Optionally, Density(6) can include the mass density of anomalous oxygen making Density(6), the effective total mass density for drag.

Density(7)

Density of H

Density(8)

Density of N

Density(9)

Anomalous oxygen number density

Data Types: double

Parameters

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Input and output units, specified as:

Units

Temperature

Height

Density

Metric (MKS)

Kelvin

Meters

kg/m3, some density outputs 1/m3

English

Rankine

Feet

lbm/ft3, some density outputs 1/ft3

Programmatic Use

Block Parameter: units
Type: character vector
Values: 'Metric (MKS)' | 'English'
Default: 'Metric (MKS)'

Select this check box to input the local apparent solar time, in hours. Otherwise, the block inputs the default value.

Programmatic Use

Block Parameter: 1st input
Type: character vector
Values: 'off' | 'on'
Default: 'off'

Select this check box to input the 81-day average of F10.7, the daily F10.7 flux for the previous day, and the array of 7 magnetic index information (see the aph argument in the atmosnrlmsise00 function). Otherwise, the block inputs the default value of 150 for F10.7 and F10.7a, and [4, 0, 0, 0, 0, 0, 0] for geomagnetic index.

Programmatic Use

Block Parameter: flux_ap_input
Type: character vector
Values: 'off' | 'on'
Default: 'off'

Variation flag source, specified as Internal or External. If you specify External, specify the variation flag as an array of 23. If you specify Internal, the flag source is internal to the block.

Dependencies

Setting Source for flags to Internal enables the Flags parameter.

Programmatic Use

Block Parameter: flags_input
Type: character vector
Values: 'Internal' | 'External'
Default: 'Internal'

Variation flag, specified as an array of 23 (ones(1,23)). This parameter applies only when Source for flags has a value of Internal. You can specify one of the following values for a field. The default value for each field is 1.

  • 0.0

    Removes that value's effect on the output.

  • 1.0

    Applies the main and the cross-term effects of that value on the output.

  • 2.0

    Applies only the cross-term effect of that value on the output.

The array has the following fields.

FieldDescription
Flags(1)

F10.7 effect on mean

Flags(2)

Independent of time

Flags(3)

Symmetrical annual

Flags(4)

Symmetrical semiannual

Flags(5)

Asymmetrical annual

Flags(6)

Asymmetrical semiannual

Flags(7)

Diurnal

Flags(8)

Semidiurnal

Flags(9)

Daily AP. If you set this field to -1, the block uses the entire matrix of magnetic index information (APH) instead of APH(:,1)

Flags(10)

All UT, longitudinal effects

Flags(11)

Longitudinal

Flags(12)

UT and mixed UT, longitudinal

Flags(13)

Mixed AP, UT, longitudinal

Flags(14)

Terdiurnal

Flags(15)

Departures from diffusive equilibrium

Flags(16)

All exospheric temperature variations

Flags(17)

All variations from 120,000 meter temperature (TLB)

Flags(18)

All lower thermosphere (TN1) temperature variations

Flags(19)

All 120,000 meter gradient (S) variations

Flags(20)

All upper stratosphere (TN2) temperature variations

Flags(21)

All variations from 120,000 meter values (ZLB)

Flags(22)

All lower mesosphere temperature (TN3) variations

Flags(23)

Turbopause scale height variations

Dependencies

Setting Source for flags to Internal enables the Flags parameter.

Programmatic Use

Block Parameter: flags
Type: character vector
Values: 'ones(1,23)'
Default: 'ones(1,23)'

Select this check box to take into account the anomalous oxygen when calculating the neutral atmosphere empirical model from the surface to lower exosphere (0 to 1,000,000 meters). Taking into account this number can affect the satellite drag above 500,000 meters.

Programmatic Use

Block Parameter: oxygen_in
Type: character vector
Values: 'off' | 'on'
Default: 'off'

Out-of-range block behavior, specified as:

ActionDescription

None

No action.

Warning

Warning in the Diagnostic Viewer, model simulation continues.

Error (default)

Error in the Diagnostic Viewer, model simulation stops.

Programmatic Use

Block Parameter: action
Type: character vector
Values: 'None' | 'Warning' | 'Error'
Default: 'Warning'

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2007b

See Also

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External Websites