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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

Library

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). 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.

This block has the limitations of the NRLMSISE-00 model. For more information, see the NRLMSISE-00 model documentation.

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

Dialog Box

Units

Specifies the input and output units:

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

Input local apparent solar time

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

Input flux and magnetic index information

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 Aerospace Toolbox atmosnrlmsise00 function). Otherwise, the block inputs the default value.

Source for flags

Specify the variation flag source. If you specify External, you must enter the variation flag as an array of 23. If you specify Internal, the flag source is internal to the block.

Flags

Specify the variation flag as an array of 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

Include anomalous oxygen number density in total mass density

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.

Action for out of range input

Specify if out-of-range input invokes a warning, error, or no action.

Inputs and Outputs

InputDimension TypeDescription

First

Three-element matrix

Contains geodetic latitudes, in degrees, longitude, in degrees, and altitude, in selected length units.

Second

Array

Contains N years.

Third

Array

Contains N days of a year (1 to 365 (or 366)).

Fourth

Array

Contains N seconds in a day, in universal time (UT).

Fifth (Optional)

Array

Contains N local apparent solar time, in hours.

Sixth (Optional)

Array

Contains N 81-day average of F10.7 flux, centered on day of year (doy).

Seventh (Optional)

Array

Contains N daily F10.7 flux for previous day.

Eight (Optional)

N-by-7 array

Contains an array of N-by-7 of magnetic index information. If you specify magneticIndex, you must also specify f107Average and f107Daily. This 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 function sets the default value to 4. See the limitations in Description for more information.

Ninth (Optional)

Array of 23

Contains flags to enable or disable particular variations for the outputs. See following table.

These flags, associated with the ninth input, 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

The outputs are:

OutputDimension TypeDescription

First

Array

Contains N-by-2 values of temperature, in selected temperature units. The first column is exospheric temperature, the second column is temperature at altitude.

Second

Array

Contains N-by-9 values of densities in selected density units. See the following table:

These densities are associated with the second output.

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

Assumptions and Limitations

The F107 and F107A values that are 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. The following site provides both classes of values:

ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/KP_AP/

The format for the data indices for these values are located here:

ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/KP_AP/kp_ap.fmt

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