Model of polar daily geomagnetic variation caused by ionospheric currents (AMPS model)
Thematic areas: Ionosphere/Magnetosphere
Applicable missions: Swarm
Applicable spacecraft: Swarm-A, Swarm-B, Swarm-C
Model of polar daily geomagnetic variation caused by ionospheric currents (AMPS model)
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(delivered separately)
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| Product identifier | MIO_SHA_2E |
| Definition | An empirical model of the Average Magnetic field and Polar current System (AMPS). See: - forward code at doi: 10.5281/zenodo.1182931 - science paper at doi: 10.1029/2018JA025387 |
| Input data | Swarm magnetic field (MAG-L) measurements, CHAMP magnetic field measurements, model predictions of core, lithospheric and large-scale magnetospheric (including Earth-induced) contributions, taken by the CHAOS geomagnetic field model, OMNI solar wind measurements, F10.7 index |
| Input time span | Entire Swarm mission + entire CHAMP mission |
| Spatial representation | Spherical harmonic expansion in QD/modified apex coordinates, with degree up to 45/65 for poloidal/toroidal magnetic field parts. Spherical harmonic order (in MLT) up to 3 |
| Time representation | Time dependence contained in parametrization in terms of external parameters: 20 min average solar wind speed and interplanetary magnetic field, dipole tilt angle, and F10.7 index |
| Units | Magnetic field in nT, horizontal sheet current density in mA/m, vertical current density in µA/m2 |
| Resolution | 0.1 nT, 1 mA/m, 0.01 µA/m2 |
| Uncertainty | See doi: 10.1029/2018JA025387 |
| Quality indicator | N/A |
| Data volume | 218 kB |
| Data format | ASCII |
| Output data | Spherical harmonic coefficient |
| Output time span | Model is based on data from entire CHAMP and Swarm missions, but it is in principle valid for any time when solar wind data was available |
| Update rate | Yearly (to be confirmed) |
| Latency | 2 months, due to update rate of OMNI data and computation time |
| Notes |
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