SEET Magnetic Field
Computes the geomagnetic field and various parameters associated with the geomagnetic field. Valid for vehicles whose central body is earth.Available for these objects: LaunchVehicle, Missile, Satellite
Type: Time-varying data.
Availability: Reports | Graphs | Dynamic Displays | Strip Charts
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | Date | Real Number or Text | Time. |
| Total intensity F | MagneticField | Real Number | The magnitude of the magnetic field at the vehicle's location. |
| North intensity X | MagneticField | Real Number | The North component of the magnetic field vector, at the vehicle's location. |
| East intensity Y | MagneticField | Real Number | The East component of the magnetic field vector, at the vehicle's location. |
| Vertical intensity Z | MagneticField | Real Number | The vertical component of the magnetic field vector, at the vehicle's location. Vertical is measured positive toward the earth along the detic nadir direction. |
| Horizontal intensity H | MagneticField | Real Number | The horizontal component of the magnetic field vector, at the vehicle's location. This is the square root of X^2 + Y^2. |
| Magnetic declination D | Angle | Real Number or Text | The angle between the horizontal projection of the magnetic field vector and the direction to north, at the vehicle's location. The value is the arctan(Y/X). Also called magnetic variation. |
| Magnetic inclination I | Angle | Real Number or Text | The angle between vertical projection of the magnetic field vector and the north-east plane, at the vehicle's location. The value is the arcsin(Z/F). |
| Dipole L-shell parameter | Unitless | Real Number | The L value for the field line passing through the vehicle's location computed using the dipole approximation to the magnetic field. For a dipole field line, the L value corresponds to the distance, measured in earth mean radii, at the point on the field line at the magnetic equator. (For a dipole field, this point is also the furthest extent of the field line from the earth.). |
| McIlwain L-shell parameter | Unitless | Real Number or Text | A measure that indicates a particle's drift shell in the magnetic field at the vehicle's location, as defined by Carl McIlwain (J. Geophys. Res. 1961). The value is computed as a function of several magnetic invariants along a field line and thus its computation requires field line tracing. It is not strictly a constant over the entire field line. In cases where the field line is close to the dipole field line (i.e., the field line traced using only the dipole component of the magnetic field model), the value will be close to the dipole L-shell parameter. |
| McIlwain Abs(L-shell) parameter | Unitless | Real Number or Text | The absolute value of the McIlwain L-shell parameter. |
| B/Beq | Unitless | Real Number or Text | The ratio of the magnetic intensity at the vehicle's location to the minimum magnetic intensity along the field line through the vehicle's location. |
| Beq | MagneticField | Real Number or Text | The minimum magnetic intensity along the field line through the vehicle's location. The minimum value occurs at the magnetic equator, at the furthest extent of the field line from the earth. |
| B Field - ECF x | MagneticField | Real Number | The x-component of the magnetic field vector at the vehicle's location, expressed in Earth Fixed axes. |
| B Field - ECF y | MagneticField | Real Number | The y-component of the magnetic field vector at the vehicle's location, expressed in Earth Fixed axes. |
| B Field - ECF z | MagneticField | Real Number | The z-component of the magnetic field vector at the vehicle's location, expressed in Earth Fixed axes. |
| B Field - ECI x | MagneticField | Real Number | The x-component of the magnetic field vector at the vehicle's location, expressed in Earth ICRF axes. |
| B Field - ECI y | MagneticField | Real Number | The y-component of the magnetic field vector at the vehicle's location, expressed in Earth ICRF axes. |
| B Field - ECI z | MagneticField | Real Number | The z-component of the magnetic field vector at the vehicle's location, expressed in Earth ICRF axes. |
| B Field - Body x | MagneticField | Real Number | The x-component of the magnetic field vector at the vehicle's location, expressed in the vehicle's body axes. |
| B Field - Body y | MagneticField | Real Number | The y-component of the magnetic field vector at the vehicle's location, expressed in the vehicle's body axes. |
| B Field - Body z | MagneticField | Real Number | The z-component of the magnetic field vector at the vehicle's location, expressed in the vehicle's body axes. |