Auroral electrojets line profile - Line current method (LC)
Thematic areas: Ionosphere/Magnetosphere, Space Weather
Applicable missions: Swarm
Applicable spacecraft: Swarm-A, Swarm-B, Swarm-C
Characterization of the electrojet sheet current density as well as the total horizontal sheet and associated large-scale field-aligned current density along the Swarm orbit ionospheric footprints at auroral latitudes (by using LC method).
N/A
(delivered separately)
| Variable | Units | Description | Dim | Type |
|---|---|---|---|---|
| t | Time of observation, UTC | 1 | CDF_EPOCH | |
| Latitude | deg | Position in ITRF - Geocentric latitude | 1 | CDF_DOUBLE |
| Longitude | deg | Position in ITRF - Geocentric longitude | 1 | CDF_DOUBLE |
| Latitude_QD | deg | Quasi-dipole latitude | 1 | CDF_DOUBLE |
| Longitude_QD | deg | Quasi-dipole longitude | 1 | CDF_DOUBLE |
| MLT | hour | Magnetic Local Time (QD) | 1 | CDF_DOUBLE |
| J | A/km | North and East component of horizontal sheet current density vector in geocentric frame | 2 | CDF_DOUBLE |
| J_QD | A/km | East component of horizontal sheet current density in QD frame | 1 | CDF_DOUBLE |
| t_qual | Time instants of quality information (RMS_misfit and Confidence), UTC | 1 | CDF_EPOCH | |
| RMS_misfit | nT | Root Mean Square error misfit between observations and model values for the oval crossings3 | 1 | CDF_DOUBLE |
| Confidence | - | Goodness of fit computed as 1 - (residual rms / signal rms) for the oval crossings3 | 1 | CDF_DOUBLE |
| Product identifier | AEJxLPL_2F |
| Definition | Latitude profiles of high-latitude ionospheric horizontal sheet current densities using the Line Current method |
| Input Data | MAGx_LR_1B, Latest CHAOS model1 including, core, lithosphere, magnetosphere and secondary currents. |
| Input Time Span | 24 h |
| Spatial representation | One geographic and quasi-dipole latitude/longitude pair for each output value. Longi-tudes and latitudes of nearest magnetic-field measurement. Given at Swarm footprints (at 110 km altitude) according to the time representation of this product2. The footprints have been determined with radial mapping. |
| Time representation | 1 deg latitude corresponding to ~ 15 s |
| Units | A/km |
| Resolution | Full resolution (Double precision) |
| Uncertainty | c.f. Olsen, N, Geophys. Res. Lett., 23, 3635-3638 and Aakjaer, C. D. et al., doi:10.1186/s40623-016-0509-y |
| Quality indicator | RMS characterizing the misfit between modelled and measured magnetic field by Swarm |
| Data volume | ~250 kB |
| Data format | CDF |
| Output time span | 24 h2 |
| Update rate | Daily |
| Latency | < 1 day |
| Notes | 1 Version information of Input Data are available in the CDF global attributes. 2 Product always contain data from the start of the first oval crossing of the day until the end of the last oval crossing starting that day, i.e. may contain data from the next day if oval crossing occurs around midnight. 3 In Line Current method the equatorward boundary of oval crossing is always at +/- 50 QD latitude and the poleward boundary is at the most poleward point in QD latitude of the satellite trajectory. |
N/A