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Short product names
SW_EFIx_LP_1B
Full product name
Electric field instrument (EFI) Langmuir probe (LP) measurements at 2Hz
Description
This product contains plasma data from the Langmuir Probe (LP) of the Electrical Field Instrument (EFI). The plasma product encompasses the plasma density and temperature. Data is provided at 2 Hz rate. The time instant are determined by the EFI instruments. No interpolation of the EFI data is performed, neither to shift the measurements in time nor to fill any gaps.
Data Access
- Files
- HTTPS (Product files): https://swarm-diss.eo.esa.int/#swarm/Level1b/Latest_baselines/EFIx_LP
- FTP (Product files): ftp://swarm-diss.eo.esa.int/Level1b/Latest_baselines/EFIx_LP
- Web services
Output variables
| Variable | Units | Description | Dim | Type |
|---|---|---|---|---|
| Timestamp | UTC | Time stamp | 1 | CDF_EPOCH |
| SyncStatus | - | Synchronization status | 1 | CDF_UINT2 |
| 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 – Radius | 1 | CDF_DOUBLE |
| U_orbit | m/s | Magnitude of spacecraft velocity in the ITRF | 1 | CDF_DOUBLE |
| Ne | cm-3 | Plasma density (electron) | 1 | CDF_DOUBLE |
| Ne_error | cm-3 | Error of the plasma density estimate | 1 | CDF_DOUBLE |
| Te | K | Plasma electron temperature | 1 | CDF_DOUBLE |
| Te_error | K | Error of the plasma electron temperature estimate | 1 | CDF_DOUBLE |
| Vs | V | Spacecraft potential | 1 | CDF_DOUBLE |
| Vs_error | V | Error of the spacecraft potential estimate | 1 | CDF_DOUBLE |
| Flags_LP | - | Flags indicating the source/method of LP measurements (ne, Te, Vs) | 1 | CDF_UINT1 |
| Flags_Ne | - | Flags characterizing the plasma density measurement | 1 | CDF_UINT1 |
| Flags_Te | - | Flags characterizing the electron temperature measurement | 1 | CDF_UINT1 |
| Flags_Vs | - | Flags characterizing the spacecraft potential measurement | 1 | CDF_UINT1 |
Details
| Flag |
Value |
Description |
|---|---|---|
| Flags_LP |
1 |
High gain probe has no errors |
| 3 |
High gain probe has errors, instead partially the low gain probe was used. See Flags_Te for implications. |
|
| 9 |
Data is from duplicated harmonic mode because of on-going sweep, it is recommended to discard these duplicate data |
|
| Flags_Ne |
10 |
Nominal data, calibration error for this sample is computed |
| 19 |
Nominal data, but calibration error not computed/out of range |
|
| 20 |
Nominal data, error for this sample is not computed |
|
| 30 |
The estimate is from low gain probe, Ne estimate probably has a larger random error than the nominal high gain probe |
|
| 40 |
Negative density (high positive values, even extremes, are not flagged) |
|
| Flags_Te |
10 |
Nominal data, calibration error for this sample is computed |
| 19 |
Nominal data, but calibration error not computed/out of range |
|
| 20 |
Nominal data, error for this sample is not computed |
|
| 12 |
Calibration error for this sample is computed, but ADC overflow at the linear bias, high gain probe, tracking ok, but discard Te is recommended |
|
| 15 |
Calibration error for this sample is computed, but ADC overflow at the linear bias, low gain probe, tracking ok, but discard Te is recommended |
|
| 22 |
Error for this sample is not computed, ADC overflow at the linear bias, high gain probe, tracking ok, but discard Te is recommended |
|
| 25 |
Error for this sample is not computed, ADC overflow at the linear bias, low gain probe, tracking ok, but discard Te is recommended |
|
| 32 |
Failed tracking, high gain probe, discard Te is recommended |
|
| 35 |
Failed tracking, low gain probe, discard Te is recommended |
|
| 36 |
Extreme value, discard Te is recommended |
|
| 40 |
Negative Te value, discard Te is recommended |
|
| 41 |
ADC overflow at the retarded bias, high gain probe, discard Te is recommended |
|
| 44 |
Wrong bias order, discard Te is recommended |
|
| 46 |
ADC overflow at the retarded bias, low gain probe, discard Te |
|
| Flags_Vs |
10 |
Nominal data, calibration error for this sample is computed |
| 20 |
Nominal data, error for this sample is not computed |
|
| 25 |
ADC overflow at the retard bias, discarding Vs is recommend |
|
| 26 |
ADC overflow at the linear bias, discarding Vs is recommend |
|
| 30 |
Failed tracking, discarding Vs is recommend |
|
| 33 |
Value of Vs is unreasonable, discarding Vs is recommended |
Related resources
Level 1B Product Descriptions:
- Swarm Level 1B Product Definition
- Swarm Level 1B Processor Algorithms
- Swarm Swarm Level 1B Plasma Processor Algorithm
Level 1B Product Format page:
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