Electric field instrument (EFI) Langmuir probe (LP) measurements at 1Hz
Thematic areas: Plasma measurements, Space Weather
Applicable missions: Swarm
Applicable spacecraft: Swarm-A, Swarm-B, Swarm-C
The EFIXLPI_1B Product contains the EFIX_LP_1B plasma data, which are data from the Langimur Probe (LP) of the Electrical Field Instrument (EFI), interpolated at full UTC seconds, the same as the low resolution magnetic data MAG_LR.
N/A
(delivered separately)
| Variable | Units | Description | Dim | Type |
|---|---|---|---|---|
| Timestamp | UTC | Time stamp | 1 | CDF_EPOCH |
| SyncStatus | - | Synchronization status | 1 | CDF_UINT2 |
| Latitude | deg | Geocentric latitude | 1 | CDF_DOUBLE |
| Longitude | deg | Geocentric longitude | 1 | CDF_DOUBLE |
| Radius | m | Distance from the Earth’s center | 1 | CDF_DOUBLE |
| U_orbit | m/s | Spacecraft velocity in the ITRF | 1 | CDF_DOUBLE |
| Ne | cm-3 | Plasma density (electron) | 1 | CDF_DOUBLE |
| Ne_error | cm-3 | Error estimate of plasma density (ne) | 1 | CDF_DOUBLE |
| Te | K | Plasma electron temperature | 1 | CDF_DOUBLE |
| Te_error | K | Error estimate of plasma electron temperature (T_elec) | 1 | CDF_DOUBLE |
| Vs | V | Spacecraft potential | 1 | CDF_DOUBLE |
| Vs_error | V | Error estimate of spacecraft potential (U_pol) | 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 |
| Flag |
Value |
Description |
|---|---|---|
| Flags_LP |
1 |
High gain probe has no errors |
| 3 |
High gain probe had errors, instead the low gain probe had to be used. See Flags_Te for implications. |
|
| 7 |
Only one original data point was used due to sweep or error with a time |
|
| Flags_Ne |
10 |
Nominal data, calibration error for this sample is computed |
| 19 |
Nominal data, but calibration error is not computed/out of range for at least one of the original data points. |
|
| 20 |
Nominal data, calibration error is not computed for both of the original data points. |
|
| 30 |
The estimate for one of the original data points is from the low gain probe. Ne estimate probably has a large random error |
|
| 31 |
The estimate for both data points is from the low gain probe. Ne estimate probably has a very large random error |
|
| 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, calibration error for at least one of the data points is not computed/out of range |
|
| 20 |
Nominal data, error for both data points is not computed |
|
| 12 |
Calibration error for this sample is computed, but at least one data point had ADC overflow at the linear bias, high gain probe, tracking ok, discard Te is recommended |
|
| 15 |
Calibration error for this sample is computed, but at least one data point had ADC overflow at the linear bias, low gain probe, tracking ok, discard Te is recommended |
|
| 22 |
Error is not computed, at least one data point had ADC overflow at the linear bias, high gain probe, tracking ok, discard Te is recommended |
|
| 25 |
Error is not computed, at least one data point had ADC overflow at the linear bias, low gain probe, tracking ok, discard Te is recommended |
|
| 32 |
Failed tracking, both data points, high gain probe, discard Te is recommended |
|
| 35 |
Failed tracking, both data points, low gain probe, discard Te is recommended |
|
| 36 |
Extreme value, both data points, discard Te is recommended |
|
| 40 |
Negative Te, both data points, discard |
|
| Flags_Vs |
10 |
Nominal data, calibration error for this sample is computed |
| 20 |
Nominal data, error for both data points is not computed |
|
| 25 |
ADC overflow at the retarded bias, both data points, discarding Vs is recommend |
|
| 26 |
ADC overflow at the linear bias, both data points, discarding Vs is recommend |
|
| 32 |
Failed tracking, both data points, discarding Vs is recommend |
|
| 33 |
Value unreasonable, both data points, discarding is recommended |
Level 1B Product Descriptions:
Level 1B Product Format page:
N/A