Timeseries of spherical harmonic expansion coefficients of the large-scale magnetospheric field as a fast-track product
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 and its Earth-induced counterpart derived in Dedicated Inversion chain. This is a fast-track product which is provided without an independent regular validation
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(delivered separately)
| Name | Type | Dim | Unit | Contents |
|---|---|---|---|---|
| t_qs | CDF_EPOCH | 1 | ms | Time instants (CDFEPOCH) of external Gauss coefficients q (cosine) and s (sine) |
| qs_geo | CDF_DOUBLE | 2 | nT | External Gauss coefficients q (cosine) and s (sine) in Geographic frame |
| qs_sm | CDF_DOUBLE | 2 | nT | External Gauss coefficients q (cosine) and s (sine) in Solar Magnetic frame |
| nm_qs | CDF_INT2 | 2 | - | First column: vector of spherical harmonic degrees of the coefficients qs_geo and qs_sm. Nonnegative values denote coefficients q (cosine) while negative values denote coefficients s (sine)Second column: vector of spherical harmonic orders |
| t_gh | CDF_EPOCH | 1 | ms | Time instants (CDFEPOCH) of induced Gauss coefficients g (cosine) and h (sine) |
| gh_geo | CDF_DOUBLE | 2 | nT | Internal induced Gauss coefficients g (cosine) and h (sine) in Geographic frame |
| gh_sm | CDF_DOUBLE | 2 | nT | Internal induced Gauss coefficients g (cosine) and h (sine) in Solar Magnetic frame |
| nm_gh | CDF_INT2 | 2 | - | First column: vector of spherical harmonic degrees of the coefficients gh_geo and gh_sm. Nonnegative values denote coefficients g (cosine) while negative values denote coefficients h (sine)Second column: vector of spherical harmonic orders |
| t_qual | CDF_EPOCH | 1 | ms | Time instants (CDFEPOCH) 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 geographic frame.First 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. |
| q_flag | CDF_UINT1 | 1 | - | Product quality flag. Value of zero indicates good quality / no issues. |
| Product identifier | MMA_SHA_2F |
|---|---|
| Definition | Spherical harmonic representation of the large scale magnetospheric field and its induced counterpart |
| Input data | MAGx_LR_1B, AUX_IGR_2_, AUX_COR_2_, MCO_SHA_2F, MCO_SHA_2C, MCO_SHA_2D, AUX_LIT_2_, MLI_SHA_2C, MIO_SHA_2C, AUX_F10_2_, AUX_IMF_2F, AUX_DST_2_, AUX_KP__2_, AUX_OBS_2_ |
| Input time span | Full Swarm data set covering at least 30 days |
| Spatial representation | Degree 1 spherical Harmonics for the external and internally induced fields |
| Time representation | Snapshot values 1.5 hours apart. |
| Units | See variable ‘Units' in ‘Data format', below. |
| Resolution | See variable ‘Type' in ‘Data format', below. |
| Uncertainty | Overall uncertainty will include contributions from uncertainties in the Input Data, which are not calculated here. Estimates of the uncertainty resulting from the modeling process after the Input Data has been processed can be obtained from the ‘rms' output variable. |
| Quality indicator | Root-mean-square difference between model and (processed) input data; number of data used per model; quality flag. |
| Data volume | ~5 MB/year |
| Output data | Time series of external and induced SH coefficients in Solar Magnetic and Geographic coordinate frames; 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 | 1 day |
| Update rate | Daily |
| Latency | < 1 day |
| Notes |
Meaning of q_flag:
| Bit | Set if |
|---|---|
| 1 | Input time-series is shorter than 1-year filter used to separate internal and external coefficients. This is unavoidable at the start of the mission. |
| 2 | Internal/external separation filter has at least one bad/missing datum. This is not necessarily serious (check n_data, above and bits 3 and 4, below). |
| 3 | total n_data for this model is < 90% of the expected maximum available. |
| 4 | Internal/external separation filter has at least one bad/missing datum amongst the most recent (five) where it is most sensitive. |
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