Filters
Filters
Short product names
SW_IPDxIRR_2F
Full product name
Ionospheric Plasma IRregularities characterised by the Swarm satellites (Swarm IPIR)
Description
Time series of characteristics of the plasma density and plasma irregularities along the orbit from single satellite measurements. Time series of local plasma conditions, including background density and total electron content. Data related to geomagnetic regions in the ionosphere. Indication of severity of plasma irregularities for groundbased users provided. Contains ionospheric plasma characteristics from multiple instruments derived at 1 Hz, updated daily with 24hour timespan.
Data Access
 Files
 HTTPS (Product files): https://swarmdiss.eo.esa.int/#swarm/Level2daily/Latest_baselines/IPD/IRR
 FTP (Product files): ftp://swarmdiss.eo.esa.int/Level2daily/Latest_baselines/IPD/IRR
 Web services
Output variables
Variable  Units  Description  Dim  Type 

Timestamp    CDF_EPOCH of the measurement.  1  CDF_EPOCH 
Latitude  deg  Position in ITRF  Latitude.  1  CDF_DOUBLE 
Longitude  deg  Position in ITRF  Longitude.  1  CDF_DOUBLE 
Radius  m  Position in ITRF  Radius.  1  CDF_DOUBLE 
Ne  cm^3  Plasma density, directly copied from the Langmuir probe files.  1  CDF_DOUBLE 
Background_Ne  cm^3  Background density, as calculated from Ne using a percentile filter of 551 datapoints (2 Hz raw data) and 35 as the percentile.  1  CDF_DOUBLE 
Foreground_Ne  cm^3  Foreground density, as calculated from ndens using a percentile filter of 7 datapoints (2 Hz raw data) and 50 as the percentile.  1  CDF_DOUBLE 
Te  K  Electron temperature, directly copied from the Langmuir probe files.  1  CDF_DOUBLE 
PCP_flag    The polar cap patch flag: 0 if the plasma density measurement occurred OUTSIDE a polar cap patch. 1 if the plasma density measurement occurred at one of the edges of a polar cap patch (no plasma velocity measurements are available). 2 if the plasma density measurement occurred at the LEADING edge of a polar cap patch. 3 if the plasma density measurement occurred at the TRAILING edge of a polar cap patch. 4 if the plasma density measurement occurred INSIDE a polar cap patch proper. When no ion drift data is available, the leading and trailing edges cannot be distinguished. In this case the polar cap patch flag is set to 4 throughout the patch proper and to 1 throughout both edges.  1  CDF_INT4 
Grad_Ne_at_100km  cm^3/m  The electron density gradient in a running window calculated via linear regression over 27 data points for the 2 Hz electron density data.  1  CDF_DOUBLE 
Grad_Ne_at_50km  cm^3/m  The electron density gradient in a running window calculated via linear regression over 13 data points for the 2 Hz electron density data.  1  CDF_DOUBLE 
Grad_Ne_at_20km  cm^3/m  The electron density gradient in a running window calculated via linear regression over 5 data points for the 2 Hz electron density data.  1  CDF_DOUBLE 
Grad_Ne_at_PCP_edge  cm^3/m  The linear electron density gradient calculated over the edges of a patch. This variable is nonzero only at the edges of polar cap patches.  1  CDF_DOUBLE 
ROD  cm^3/s  Rate Of change of Density  1  CDF_DOUBLE 
RODI10s  cm^3/s  Rate Of change of Density Index (RODI) is the standard deviation of ROD over 10 seconds.  1  CDF_DOUBLE 
RODI20s  cm^3/s  Rate Of change of Density Index (RODI) is the standard deviation of ROD over 20 seconds.  1  CDF_DOUBLE 
delta_Ne10s  cm^3  Derived by subtracting Ne by its median filtered value in 10 seconds. As a result, delta_Ne10s indicates the electron density fluctuations smaller than 75 km.  1  CDF_DOUBLE 
delta_Ne20s  cm^3  Derived by subtracting Ne by its median filtered value in 20 seconds. As a result, delta_Ne20s indicates the electron density fluctuations smaller than 150 km.  1  CDF_DOUBLE 
delta_Ne40s  cm^3  Derived by subtracting Ne by its median filtered value in 40 seconds. As a result, delta_Ne40s indicates the electron density fluctuations smaller than 300 km.  1  CDF_DOUBLE 
Num_GPS_satellites    Total number of tracked GPS satellites above 20 degrees.  1  CDF_INT4 
mVTEC  TECU  Median of VTEC from all available GPS satellites above 30 degrees.  1  CDF_DOUBLE 
mROT  TECU/s  Median of Rate Of change of TEC (ROT) from all available GPS satellites above 30 degrees.  1  CDF_DOUBLE 
mROTI10s  TECU/s  Median of Rate Of change of TEC Index (ROTI) from all available GPS satellites above 30 degrees. The ROTI of each satellite is the standard deviation of ROT over 10 seconds.  1  CDF_DOUBLE 
mROTI20s  TECU/s  Median of Rate Of change of TEC Index (ROTI) from all available GPS satellites above 30 degrees. The ROTI of each satellite is the standard deviation of ROT over 20 seconds.  1  CDF_DOUBLE 
IBI_flag    Plasma Bubble Index, copied from the level2 Ionospheric Bubble Index product, IBIxTMS_2F.  1  CDF_INT4 
Ionosphere_region_flag    0: equator, 1: midlatitudes; 2: auroral oval; 3: polar cap.  1  CDF_INT4 
IPIR_index    The numeric index for plasma fluctuations and irregularities: 03 low, 45 medium, and > 6 high level of ionosphericplasma irregularities.  1  CDF_INT4 
Ne_quality_flag    Quality flag for the Ne data and the derived data from Ne, e.g., background density, foreground density etc.  1  CDF_INT4 
TEC_STD  TECU  STD of VTEC from all GPS satellites.  1  CDF_DOUBLE 
Details
Product Identifier  IPDxIRR_2F 
Data Access  Can be downloaded directly via an ftp client at ftp://swarmdiss.eo.esa.int/Level2daily/Latest_baselines/IPD/IRR/ or via any HTTP browser at https://swarmdiss.eo.esa.int/ 
Science Paper 

Definition  Time series of characteristics of the plasma density and plasma irregularities along the orbit from single satellite measurements. Time series of local plasma conditions, including background density and total electron content. Data related to geomagnetic regions in the ionosphere. Indication of severity of plasma irregularities for groundbased users provided 
Input data  EFI_LP_1B, TECxTMS_2F, AOBxFAC_2F, IBIxTMS_2F, PCP – Polar Cap Products 
Input time span  3 days 
Spatial representation  Data provided along entire orbits at positions of Swarm A, B, and C 
Time representation  1 second time series (the electron density data are downsampled to 1 second resolution; the timestamp of the electron density and TEC data are rounded to the nearest integer UTC seconds) 
Units  See data format table 
Resolution  Temporal data resolution of 1 second, density variations estimated at 0.5 second resolution 
Uncertainty  N/A 
Quality indicator  Quality flags are handed through from Level 1b and Level 2 processing which is used as input data 
Data volume  ca.10 MB per day, per satellite 
Data format  CDF 
Output time span  1 day 
Update rate  1 per day 
Latency  10 min 
Notes  The meanings of the PCP_flag are as follows: 0 if the plasma density measurement occurred outside a polar cap patch. 1 if the plasma density measurement occurred at one of the edges of a polar cap patch (no plasma velocity measurements are available). 2 if the plasma density measurement occurred at the leading edge of a polar cap patch. 3 if the plasma density measurement occurred at the trailing edge of a polar cap patch. 4 if the plasma density measurement occurred inside a polar cap patch proper. When no ion drift data is available, the leading and trailing edges cannot be distinguished. In this case the polar cap patch flag is set to 4 throughout the patch proper and to 1 throughout both edges 