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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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

• This block has the limitations of the NRLMSISE-00 model. For more information, see https://ccmc.gsfc.nasa.gov/.

• This block is valid only for altitudes between 0 and 1,000,000 meters (1,000 kilometers).

• The F107 and F107A values used to generate the model correspond to the 10.7 cm radio flux at the actual distance of the Earth from the Sun rather than the radio flux at 1 AU. This site provide both classes of values: https://www.ngdc.noaa.gov/stp/space-weather/solar-data/solar-features/solar-radio/noontime-flux/penticton/

Ports

Input

Port_1 — Geodetic latitudes, longitude, and altitude

three-element matrix

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

Data Types: double

Port_2 — Years

array

N years, specified as an array.

Data Types: double

Port_3 — Days

array

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

Data Types: double

Port_4 — Seconds

array

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

Data Types: double

Port_5 — Local apparent solar time

array

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

Data Types: double

Port_6 — 81-day average F10.7 flux

array

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

Data Types: double

Port_7 — Daily average F10.7 flux

array

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

Data Types: double

Port_8 — Magnetic index information

N-by-7 array

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. See the limitations in Limitations for more information.

Data Types: double

Port_9 — Flags

array of 23

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

Field	Description
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

Port_1 — Temperature

N-by-2 array

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

Port_2 — Densities

N-by-9 array

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

Density	Description
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

Units — Input and output units

Metric (MKS) (default) | English

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)'

Input local apparent solar time — Apparent solar time

off (default) | on

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'

Input flux and magnetic index information — Daily F10.7 flux for previous day and magnetic index information

off (default) | on

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.

Programmatic Use

Block Parameter: flux_ap_input

Type: character vector

Values: 'off' | 'on'

Default: 'off'

Source for flags — Variation flag source

Internal (default) | External

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'

Flags — Variation flags

ones(1,23) (default)

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.

Field	Description
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)'

Include anomalous oxygen number density in total mass density — Anomalous oxygen

off (default) | on

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'

Action for out-of-range input — Out-of-range block behavior

None (default) | Warning | Error

Out-of-range block behavior, specified as:

Action	Description
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