Parameters of the start point and the lowest observed height of the fireball are used as input data for a DFMC simulation. In the parameter file for our code, there are several other inputs, like time code and limit to calculated trajectories, but they are part of the programme execution and do not belong to the algorithm of the simulation.
| Symbols . | Parameter . | Unit . | Remarks . | Default error . |
|---|---|---|---|---|
| λ0 | Longitude | degrees | WGS84 (west < 0° < east) | Included in e0 |
| φ0 | Latitude | degrees | WGS84 (south < 0° < north) | Included in e0 |
| h0 | Altitude | m | Above the sea level | Included in e0 |
| e0 | Spatial error at the start point | m | An uncertainty sphere | ±300 m |
| δ0 | Direction of trajectory | degrees | 0°–360° (0° = N, clockwise) | ±1|${_{.}^{\circ}}$|8 |
| γ0 | Trajectory slope | degrees | 0°–90° (90° = vertical) | ±1|${_{.}^{\circ}}$|8 |
| V0 | Velocity | m s−1 | Velocity at the start point | ±300 m s−1 |
| a0 | Deceleration limit | m s−2 | Defines acceptable deceleration at the start point | a ≥ 0.99a0 |
| he | End height of fireball | m | Lowest observed altitude | No variations |
| ρm | Density of meteoroid | kg m−3 | For chondrites 3300 kg m−3 | ±500 kg m−3 |
| Symbols . | Parameter . | Unit . | Remarks . | Default error . |
|---|---|---|---|---|
| λ0 | Longitude | degrees | WGS84 (west < 0° < east) | Included in e0 |
| φ0 | Latitude | degrees | WGS84 (south < 0° < north) | Included in e0 |
| h0 | Altitude | m | Above the sea level | Included in e0 |
| e0 | Spatial error at the start point | m | An uncertainty sphere | ±300 m |
| δ0 | Direction of trajectory | degrees | 0°–360° (0° = N, clockwise) | ±1|${_{.}^{\circ}}$|8 |
| γ0 | Trajectory slope | degrees | 0°–90° (90° = vertical) | ±1|${_{.}^{\circ}}$|8 |
| V0 | Velocity | m s−1 | Velocity at the start point | ±300 m s−1 |
| a0 | Deceleration limit | m s−2 | Defines acceptable deceleration at the start point | a ≥ 0.99a0 |
| he | End height of fireball | m | Lowest observed altitude | No variations |
| ρm | Density of meteoroid | kg m−3 | For chondrites 3300 kg m−3 | ±500 kg m−3 |
Parameters of the start point and the lowest observed height of the fireball are used as input data for a DFMC simulation. In the parameter file for our code, there are several other inputs, like time code and limit to calculated trajectories, but they are part of the programme execution and do not belong to the algorithm of the simulation.
| Symbols . | Parameter . | Unit . | Remarks . | Default error . |
|---|---|---|---|---|
| λ0 | Longitude | degrees | WGS84 (west < 0° < east) | Included in e0 |
| φ0 | Latitude | degrees | WGS84 (south < 0° < north) | Included in e0 |
| h0 | Altitude | m | Above the sea level | Included in e0 |
| e0 | Spatial error at the start point | m | An uncertainty sphere | ±300 m |
| δ0 | Direction of trajectory | degrees | 0°–360° (0° = N, clockwise) | ±1|${_{.}^{\circ}}$|8 |
| γ0 | Trajectory slope | degrees | 0°–90° (90° = vertical) | ±1|${_{.}^{\circ}}$|8 |
| V0 | Velocity | m s−1 | Velocity at the start point | ±300 m s−1 |
| a0 | Deceleration limit | m s−2 | Defines acceptable deceleration at the start point | a ≥ 0.99a0 |
| he | End height of fireball | m | Lowest observed altitude | No variations |
| ρm | Density of meteoroid | kg m−3 | For chondrites 3300 kg m−3 | ±500 kg m−3 |
| Symbols . | Parameter . | Unit . | Remarks . | Default error . |
|---|---|---|---|---|
| λ0 | Longitude | degrees | WGS84 (west < 0° < east) | Included in e0 |
| φ0 | Latitude | degrees | WGS84 (south < 0° < north) | Included in e0 |
| h0 | Altitude | m | Above the sea level | Included in e0 |
| e0 | Spatial error at the start point | m | An uncertainty sphere | ±300 m |
| δ0 | Direction of trajectory | degrees | 0°–360° (0° = N, clockwise) | ±1|${_{.}^{\circ}}$|8 |
| γ0 | Trajectory slope | degrees | 0°–90° (90° = vertical) | ±1|${_{.}^{\circ}}$|8 |
| V0 | Velocity | m s−1 | Velocity at the start point | ±300 m s−1 |
| a0 | Deceleration limit | m s−2 | Defines acceptable deceleration at the start point | a ≥ 0.99a0 |
| he | End height of fireball | m | Lowest observed altitude | No variations |
| ρm | Density of meteoroid | kg m−3 | For chondrites 3300 kg m−3 | ±500 kg m−3 |
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