SW_EFIx_LP_1B

Electric field instrument (EFI) Langmuir probe (LP) measurements at 2Hz

Thematic areas: Plasma measurements, Space Weather

Applicable missions: Swarm

Applicable spacecraft: Swarm-A, Swarm-B, Swarm-C

Description

The EFIx_LP_1B 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

FAST processing

N/A

Preview image

(delivered separately)

File contents

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

More 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:

Level 1B Product Format page:

Changelog

N/A