Filters
Filters
Short product names
SW_MITx_LP_2F
Full product name
Midlatitude Ionospheric Trough Boundaries and Minima derived from LP (Langmuir Probe)
Description
Midlatitude Ionospheric Trough Boundaries and Minima derived from LP (Langmuir Probe)
Data Access
- Files
- HTTPS (Product files): https://swarm-diss.eo.esa.int/#swarm/Level2daily/Latest_baselines/MIT/LP
- FTP (Product files): ftp://swarm-diss.eo.esa.int/Level2daily/Latest_baselines/MIT/LP
- Web services
Output variables
Variable | Units | Description | Dim | Type |
---|---|---|---|---|
Timestamp | ms | Time of observation, UTC | 1 | CDF_EPOCH |
Counter | Swarm orbit counter and quarter orbit (four per Swarm orbit) counter that are based on magnetic coordinates as defined in [AD-2] (Sect. 4.1.2.2) | 2 | CDF_UINT4 | |
Latitude | deg | Position of the MIT minimum in ITRF - Geocentric latitude | 1 | CDF_DOUBLE |
Longitude | deg | Position of the MIT minimum in ITRF - Geocentric longitude | 1 | CDF_DOUBLE |
Radius | m | Position of the MIT minimum in ITRF - Geocentric radius (from the Earth center) | 1 | CDF_DOUBLE |
Latitude_QD | deg | QD latitude of the MIT minimum | 1 | CDF_DOUBLE |
Longitude_QD | deg | QD longitude of the MIT minimum | 1 | CDF_DOUBLE |
MLT | h | Magnetic Local Time of MIT minimum | 1 | CDF_DOUBLE |
L_value | L-value of the MIT minimum | 1 | CDF_DOUBLE | |
SZA | deg | Solar zenith angle of the MIT minimum | 1 | CDF_DOUBLE |
Ne | cm^{-3} | LP electron densities of the MIT minimum | 1 | CDF_DOUBLE |
Te | K | LP electron temperatures of the MIT minimum | 1 | CDF_DOUBLE |
Depth | cm^{-3} | Depth of the MIT | 1 | CDF_DOUBLE |
DR | % | Relative change in density within the MIT | 1 | CDF_DOUBLE |
Width | deg | Width of the MIT calculated from QD latitudes | 1 | CDF_DOUBLE |
dL | Width of the MIT calculated from L-values | 1 | CDF_DOUBLE | |
PW_Gradient | log(cm^{-3})/deg | Change in log electron density at the poleward wall of the MIT divided by QD latitude difference | 1 | CDF_DOUBLE |
EW_Gradient | log(cm^{-3})/deg | Change in log electron density at the equatorward wall of the MIT divided by QD latitude difference | 1 | CDF_DOUBLE |
Quality | Characterizes the detection quality of the MIT as a whole | 8 | CDF_INT1 | |
Timestamp_ID | Vector of times of observation, UTC | 7 | CDF_EPOCH | |
Latitude_ID | deg | Vector of Positions in ITRF - Geocentric latitude | 7 | CDF_DOUBLE |
Longitude_ID | deg | Vector of Positions in ITRF - Geocentric longitude | 7 | CDF_DOUBLE |
Radius_ID | m | Vector of Positions in ITRF - Geocentric radius (from the Earth centre) | 7 | CDF_DOUBLE |
Latitude_QD_ID | deg | Vector of QD latitudes | 7 | CDF_DOUBLE |
Longitude_QD_ID | deg | Vector of QD longitudes | 7 | CDF_DOUBLE |
MLT_ID | h | Vector of Magnetic Local Times | 7 | CDF_DOUBLE |
L_value_ID | Vector of L-values in Earth radii | 7 | CDF_DOUBLE | |
SZA_ID | deg | Vector of solar zenith angles | 7 | CDF_DOUBLE |
Ne_ID | cm^{-3} | Vector of LP electron densities | 7 | CDF_DOUBLE |
Te_ID | K | Vector of LP electron temperatures | 7 | CDF_DOUBLE |
Position_Quality_ID | Vector of quality indicators characterizing the detection quality of each single positions | 7 | CDF_INT1 |
Details
Product identifier | MITx_LP_2F |
Definition | Midlatitude Ionospheric Trough Boundaries and Minima from LP |
Input data | EFIx_LP_1B^{1}, TECxTMS_2F^{1}, FACxTMS_2F^{1}, AOBxFAC_2F^{1}, AUXxORBCNT |
Input time span | Up to one year^{2} |
Spatial representation | One geographic and QD-latitude/longitude pair, the McIlwain L-value as well as radius for each output position at the nearest LP measurement for each trough crossing, i.e., up to four per orbit. |
Time representation | Up to four records per orbit (up to one record per orbit quarter) |
Units | see at Output Data below |
Resolution | 0.1 degree for coordinates, 0.01 for L-value |
Uncertainty | ~1 degree for coordinates, ~0.1 for L-value |
Quality indicator | Quality vector flag values are integers ranging from 3 to -1. Positive values indicate good or acceptable observation, while -1 means a likely false observation. For all flags, a 0 value means that the information needed to derive the flag is not available. In general, greater numbers indicate higher quality. A detailed description of the derivation of these flags is given in Swarm PRISM processing algorithm description (see also related resources) Position_Quality_ID describes the overall quality of the corresponding boundary/position identified by ID. The possible values and their meaning are 3: highest quality; 2: fair quality; 1: uncertain detection; -1: a likely false positive detection; -2: the corresponding boundary/position is not defined. A detailed description of the derivation of these flags is given in Swarm PRISM processing algorithm description (see also related resources) |
Data volume | Up to 4.2 MB |
Output data | See file contents |
Output time span | Up to one year^{2} |
Latency | < 5 minutes |
Update rate | Daily |
Notes | ^{1} Version information of Input Data are available in the CDF global attributes. ^{2} Product always contains data from the start of the first boundary crossing of the first day until the end of the last boundary-crossing starting the latest day available for that year, i.e., may contain data from the next day if boundary crossing occurs around midnight. ^{3} The meaning of ID: 1 – LP MIT equatorward edge of the equatorward wall; 2 – LP MIT poleward edge of the equatorward wall; 3 – LP MIT equatorward edge of poleward wall; 4 – LP MIT poleward edge of the poleward boundary; 5 – LP SETE equatorward bounding position; 6 – LP Te peak position; 7 – LP SETE poleward bounding position. ^{4} NaN values: if an ID is not identified Timestamp_ID is set to {the value of} Timestamp and corresponding variable values will be set to NaNs, while the corresponding Position_Quality_ID is set to -2. |