Aerospace Blockset™

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.

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 1m³
`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 atmosnrlmsise00 function of the Aerospace Toolbox User's Guide). 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.

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

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

Input	Dimension Type	Description
First	Array	Contains `N` altitude, in meters.
Second	Array	Contains `N` latitudes, in degrees.
Third	Array	Contains `N` longitude, in degrees.
Fourth	Array	Contains `N` years.
Fifth	Array	Contains `N` days of a year (1 to 365 (or 366)).
Sixth	Array	Contains `N` seconds in a day, in universal time (UT).
Seventh	Array	Contains `N` local apparent solar time, in hours.
Eighth	Array	Contains `N` 81-day average of F10.7 flux, centered on day of year (doy).
Ninth	Array	Contains `N` daily F10.7 flux for previous day.
Tenth	N-by-7 array	Contains `N`-by-7 of magnetic index information.
Eleventh	Array of 23	Contains flags to enable or disable particular variations for the outputs. See following table.
Twelfth	String	Specifies total mass density output. `'Oxygen'` Total mass density outputs include anomalous oxygen number density. `'NoOxygen'` Total mass density outputs do not include anomalous oxygen number density.
Thirteenth	Action	Determines action for out-of-range input. Specify if out-of-range input invokes a `'Warning'`, `'Error'`, or no action (`'None'`). The default is `'Warning'`.

These flags, associated with the eleventh input, 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

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/SOLAR_DATA/SOLAR_RADIO/FLUX/

Non-Standard Day 310

Pack net_fdm Packet for FlightGear