Timeseries of spherical harmonic expansion coefficients of the large-scale magnetospheric field from the comprehensive inversion chain
Thematic areas: Ionosphere/Magnetosphere, Space Weather
Applicable missions: Swarm
Applicable spacecraft: Swarm-A, Swarm-B, Swarm-C
Timeseries of spherical harmonic expansion coefficients of the large-scale magnetospheric field from the comprehensive inversion chain
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(delivered separately)
| Name | Type | Dim | Unit | Contents |
|---|---|---|---|---|
| t_qs_1 | CDF_EPOCH | 1 | ms | Time instants of external Gauss coefficients q (cosine) and s (sine) |
| qs_1 | CDF_DOUBLE | 1 | nT | External Gauss coefficients q (cosine) and s (sine) in dipole frame corresponding to time instants t_qs_1 |
| dqs_1 | CDF_DOUBLE | 1 | nT | Formal error estimate for qs_1 |
| nm_qs_1 | CDF_INT2 | 1 | - | First column: vector of spherical harmonic degrees of the coefficients qs_1. Second column: vector of spherical harmonic orders. Nonnegative values denote coefficients q (cosine) while negative values denote coefficients s (sine) |
| t_qs_2 | CDF_EPOCH | 1 | ms | Time instants of external Gauss coefficients q (cosine) and s (sine) |
| qs_2 | CDF_DOUBLE | 2 | nT | External Gauss coefficients q (cosine) and s (sine) in dipole frame corresponding to time instants t_qs_2 |
| dqs_2 | CDF_DOUBLE | 2 | nT | Formal error estimate for qs_2 |
| nm_qs_2 | CDF_INT2 | 2 | - | First column: vector of spherical harmonic degrees of the coefficients qs_2.Second column: vector of spherical harmonic orders. Nonnegative values denote coefficients q (cosine) while negative values denote coefficients s (sine) |
| t_gh_1 | CDF_EPOCH | 1 | ms | Time instants of induced Gauss coefficients g (cosine) and h (sine) |
| gh_1 | CDF_DOUBLE | 1 | nT | Internal induced Gauss coefficients g (cosine) and h (sine) in dipole frame |
| dgh_1 | CDF_DOUBLE | 1 | nT | Formal error estimate for gh_1 |
| nm_gh_1 | CDF_INT2 | 1 | - | First column: vector of spherical harmonic degrees of the coefficients gh_1.Second column: vector of spherical harmonic orders. Nonnegative values denote coefficients g (cosine) while negative values denote coefficients h (sine) |
| t_gh_2 | CDF_EPOCH | 1 | ms | Time instants of induced Gauss coefficients g (cosine) and h (sine) |
| gh_2 | CDF_DOUBLE | 2 | nT | Internal induced Gauss coefficients g (cosine) and h (sine) in dipole frame |
| dgh_2 | CDF_DOUBLE | 2 | nT | Formal error estimate for gh_2 |
| nm_gh_2 | CDF_INT2 | 2 | - | First column: vector of spherical harmonic degrees of the coefficients gh_2.Second column: vector of spherical harmonic orders. Nonnegative values denote coefficients g (cosine) while negative values denote coefficients h (sine) |
| t_qual | CDF_EPOCH | 1 | ms | Time instants of quality information (rms, n_data, and q_flag). |
| rms | CDF_DOUBLE | 2 | nT | Root-mean-square difference between models and input data (after processing to subtract non-magnetospheric sources) in dipole frame, for the time instants indicated by t_qualFirst column: RMS difference in radial direction. Second column: RMS difference in theta direction. Third column: RMS difference in phi direction. |
| n_data | CDF_UINT2 | 2 | - | Number of data used at each time-instant from each satellite.First column: Number of data from SWARM A. Second column: Number of data from SWARM B. Third column: Number of data from SWARM C. |
| Product identifier | MMA_SHA_2C |
|---|---|
| Definition | Spherical harmonic representation of the large scale magnetospheric field and of its induced counterpart |
| Input data | MMA_SHAi2C, MMA_VAL_2_ |
| Input time span | All available quiet time observations from the mission |
| Spatial representation | Spherical Harmonics of degree and order at least 1 for the external field and of degree and order at least 5 for its Earth induced counterpart |
| Time representation | Time series |
| Units | nT |
| Resolution | ≤ 1 pT |
| Uncertainty | Refer to product quality report |
| Quality indicator | Statistics of data misfit provided in the validation report |
| Data volume | ~2 MB/year |
| Output data | Time series of external and induced SH coefficients in dipole coordinate frame; root-mean-square differences between (processed) input data and models; number of data from each satellite used for each model; quality flag |
| Output time span | Time span as input |
| Update rate | First after 1 year, updated every year |
| Latency | 1.5 months |
| Notes |
Part of the CI (comprehensive inversion) chain, related to the "CM" model series, see e.g.:
Sabaka, T.J., Tøffner-Clausen, L., Olsen, N. et al. CM6: a comprehensive geomagnetic field model derived from both CHAMP and Swarm satellite observations. Earth Planets Space 72, 80 (2020). https://doi.org/10.1186/s40623-020-01210-5
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