Filters
Filters
Short product names
SW_AOBxFAC_2F
Full product name
Auroral oval boundaries derived from FACs
Description
Auroral oval boundaries, associated with auroral precipitation, estimated from the presence of small-scale (<150 km) field-aligned currents.
Data Access
- Files
- HTTPS (Product files): https://swarm-diss.eo.esa.int/#swarm/Level2daily/Latest_baselines/AOB/FAC
- FTP (Product files): ftp://swarm-diss.eo.esa.int/Level2daily/Latest_baselines/AOB/FAC
- Web services
Output variables
| 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 |
| Radius | m | Position in ITRF - Geocentric radius (from the Earth center) | 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 |
| Boundary_Flag | Indicator for equatorward (=1) or poleward (=2) boundary | 1 | CDF_UINT1 | |
| Quality | Quality indicator of equatorward/poleward boundary (Pa, Sigma) | 2 | CDF_DOUBLE | |
| Pair_Indicator | Indicator of equatorward/poleward boundary of auroral oval. If the auroral oval boundaries are detectable as one pair, the pair indicator represents the record of previous (-1) or next (1) equatorward/poleward boundary within one pair; otherwise, the pair indicator is set to 0 | 1 | CDF_INT1 |
Details
| Product identifier | AOBxFAC_2F | ||||||
| Definition | Auroral Oval Boundaries using the FAC method | ||||||
| Input Data | FACxTMS_2F1 | ||||||
| Input Time Span | Up to one year | ||||||
| Spatial representation | One geographic and quasi-dipole latitude/longitude as well as magnetic local time for each output value at the nearest magnetic-field measurement. | ||||||
| Time representation | One timestamp for each boundary represented by the geographic and quasi-dipole latitude/longitude as well as magnetic local time. | ||||||
| Units | Degrees | ||||||
| Resolution | Full resolution (Double precision) | ||||||
| Uncertainty | 3 deg, c.f. Xiong, C. and Lühr, H., doi: 10.5194/angeo-32-623-2014 | ||||||
| Quality indicator |
|
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| Data volume | Up to 2.5 MB | ||||||
| Data format | CDF | ||||||
| Output time span | Up to one year2 | ||||||
| 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 year until the end of the last oval crossing starting that year, i.e., may contain data from the next year if oval crossing occurs around midnight. |
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