STK Components for .NET 2021 r3

## ScalarDensityJacchia1970 Properties |

The ScalarDensityJacchia1970 type exposes the following members.

Properties

Name | Description | |
---|---|---|

AverageSolarRadioFluxLagSeconds |
Gets the value for the time lag used when modeling when to apply the values of
AverageSolarRadioFlux to the atmosphere.
Jacchia models use a time lag of one day.
| |

CentralBody |
Gets or sets the central body of the atmosphere described by the density model. This is set to the Earth by default.
(Inherited from ScalarAtmosphericDensity.) | |

Dimension |
Gets the dimension of the values produced by the object. For example, Vectors
would have a dimension of three, and Scalars of one. A PartialDerivativesEvaluator
created by this type will have a "RowDimension" equal to this
property, and a "ColumnDimension equal to the summation
of the dimensions of the independent variables that this object is dependent on.
| |

GeomagneticFluxLagSeconds |
Gets the value for the time lag used when modeling when to apply the values of
GeomagneticFlux to the atmosphere.
Jacchia models use a time lag of 24120.0 seconds.
| |

IsFrozen |
Gets a value indicating whether this object is frozen. A frozen object cannot be modified and an
ObjectFrozenException will be thrown if an attempt is made to do so.
(Inherited from DefinitionalObject.) | |

LowerHeightLimit |
Gets the lower bound of the height (in meters above the ellipsoid)
for which this density model is valid. Jacchia 1970 is only valid at and
above 90,000 meters. This model will still produce results at lower
altitudes, but should not be considered accurate.
(Overrides ScalarAtmosphericDensityLowerHeightLimit.) | |

SolarGeophysicalData |
Gets or sets the solar and magnetic flux information.
(Inherited from ScalarAtmosphericDensity.) | |

SolarRadioFluxLagSeconds |
Gets the value for the time lag used when modeling when to apply the values of
SolarRadioFlux to the atmosphere.
Jacchia models use a time lag of one day.
| |

TargetPoint |
Gets or sets the target point describing the time-varying position at which density is
to be calculated.
(Inherited from ScalarAtmosphericDensity.) | |

UpperHeightLimit |
Gets or sets the upper bound of the height (in meters above the ellipsoid)
above which this density model will return a value of zero. The default value is 2500000 meters.
(Overrides ScalarAtmosphericDensityUpperHeightLimit.) | |

UseApproximateAltitude |
Gets or sets a value indicating whether to use approximate altitude when computing the height above
the surface of the central body. Using approximate height will generally speed up the calculations
while only producing a small discrepancy in the density. By default, this value is true.
| |

VectorToSun |
Gets or sets the vector to the sun to use for modeling the effects of solar radiation on the atmosphere.
By default, this is set to represent the apparent displacement from the Earth
to the Sun based on light time delay and aberration from the relative
motion of the celestial bodies. Setting this to use the true displacement
will be slightly less accurate but take less time to compute. However, not all density models will use the Sun's position.
(Inherited from ScalarAtmosphericDensity.) |

See Also