MSIS Density Models
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The MSIS-00, MSIS-90, and MSIS-86 atmospheric models use a combination of F10.7 flux and Ap data to determine atmospheric density as a function of geopotential height. For more information on the MSIS models courtesy of the Naval Research Laboratory, see this website: NRL Mass Spectrometer, Incoherent Scatter Radar Extended Model.
By default, FreeFlyer will use the CSSI Space Weather file included in the installation with the MSIS models, but you can specify a different file or a custom drag model using a User-Created Atmospheric Drag File. This is useful for performing analysis using different predicted magnitudes and phases of the solar cycle.
This page is divided into the following sections:
The default atmospheric density model used for modeling the Earth's atmosphere is the Analytic Density Model. To enable an MSIS Density Model for a Spacecraft, edit the Spacecraft, proceed to the Force Model page, and select Earth from the list of celestial bodies as shown in the image below.
Then ensure that "MSIS-2000", "MSIS-90", or "MSIS-86" is selected in the Density Model drop-down menu.
To enable MSIS atmospheric density modeling via FreeFlyer script, use the following syntax:
Where the AtmosphericDensityModel can be one of the following:
By default, FreeFlyer uses the "solar_flux_cssi_space_weather.txt" data file for MSIS atmospheric modeling, but you can specify a different file using the "Solar Flux Predictor File" file browser shown in the image above or via FreeFlyer script using this syntax:
Where "MSISdragfile.dat" specifies the path and filename of the predictor file.
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