SW_AEJxPBS_2F

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Short product names

CH_DNS_ACC_2_CH_TEC_TMS_2F CH_WND_ACC_2_CS_MAG GF_DNSxACC_2_GF_NE__KBR_2F GF_TECxTMS_2F GF_WNDxACC_2_GFx_FGM_ACAL_CORR GO_MAG_ACAL_CORR GR_DNSxACC_2_GR_NE__KBR_2F GR_TECxTMS_2F GR_WNDxACC_2_GRACE_x_MAG MM_CON_EPH_2_SW_ACCx_AE_2_SW_ACCxCAL_2_SW_ACCxPOD_2_SW_AEJxLPL_2F SW_AEJxLPS_2F SW_AEJxPBL_2F SW_AEJxPBS_2F SW_AOBxFAC_2F SW_ASMxAUX_1B SW_ASMxBUR_1B SW_AUXxORBCNT SW_CFW_SHA_2Y SW_DNSxACC_2_SW_DNSxPOD_2_SW_EEFxTMS_2F SW_EFIx_LP_1B SW_EFIx_LP_FP SW_EFIx_LP_HM SW_EFIx_TCT02 SW_EFIx_TCT16 SW_EFIx_TII1B SW_EFIxIDM_2_SW_EFIxLPI_1B SW_EFIxTIE_2_SW_EFIxTISH1B SW_EFIxTISL1B SW_EGF_SHA_2_SW_FAC_LLS_2F SW_FAC_SVD_2F SW_FAC_TMS_2F SW_FACxTMS_2F SW_GPSx_RN_1B SW_GPSx_RO_1B SW_GPSxNAV_1B SW_IBIxTMS_2F SW_IBP_CLI_2_SW_IPDxIRR_2F SW_LP_x_CA_1B SW_MAGx_CA_1B SW_MAGx_HR_1B SW_MAGx_LR_1B SW_MCO_SHA_2C SW_MCO_SHA_2D SW_MCO_SHA_2F SW_MCO_SHA_2X SW_MCO_SHA_2Y SW_MCR_1DM_2_SW_MIN_1DM_2_SW_MIO_SHA_2C SW_MIO_SHA_2D SW_MIO_SHA_2E SW_MITx_LP_2F SW_MITxTEC_2F SW_MLI_SHA_2C SW_MLI_SHA_2D SW_MLI_SHA_2E SW_MMA_SHA_2C SW_MMA_SHA_2F SW_MODx_SC_1B SW_MTI_SHA_2C SW_NIX_TMS_2F SW_PC1xMAG_2F SW_PPIxFAC_2F SW_SC_xDYN_1B SW_SP3xCOM_2_SW_SP3xKIN_2_SW_STRxATT_1B SW_STRxEPF_1B SW_TECxTMS_2F SW_TIX_TMS_2F SW_ULFxMAG_2F SW_VFMxAUX_1B SW_VOBS_1M_2_SW_VOBS_4M_2_SW_WHIxEVT_2_

Full product name

Auroral electrojets peaks and boundaries from SECS

DOI:

European Space Agency, Finnish Meteorological Institute, 2020, "SW_AEJxPBS_2F", European Space Agency, https://doi.org/10.57780/esa-4d79355

Description

Characterization of the auroral electrojets and auroral oval boundaries (by using SECS method).

Data Access

Files
- HTTPS (Product files): https://swarm-diss.eo.esa.int/#swarm/Level2daily/Latest_baselines/AEJ/PBS
- FTP (Product files): ftp://swarm-diss.eo.esa.int/Level2daily/Latest_baselines/AEJ/PBS
Web services

Output variables

Variable	Units	Description	Dim	Type
t_Peak		Time of WEJ and EEJ peaks in the order as they appear in the satellite flight direction, UTC⁴	2	CDF_EPOCH
Latitude_Peak	deg	Geocentric latitude in ITRF of WEJ and EEJ peaks in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_Peak	deg	Geocentric longitude in ITRF of WEJ and EEJ peaks in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Latitude_Peak_QD	deg	QD latitude of WEJ and EEJ peaks in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_Peak_QD	deg	QD latitude of WEJ and EEJ peaks in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
MLT_Peak	hour	Magnetic Local Time (QD) of WEJ and EEH peaks in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
J_DF	A/km	Peaks (minimum (WEJ) and maximum (EEJ)) of the divergence-free sheet current density in semiQD¹ frame in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
t_EB		Time of WEJ and EEJ equatorward boundaries in the order as they appear in the satellite flight direction, UTC⁴	2	CDF_EPOCH
Latitude_EB	deg	Geocentric latitude of WEJ and EEJ equatorward boundaries in ITRF in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_EB	deg	Geocentric longitude of WEJ and EEJ equatorward boundaries in ITRF in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Latitude_EB_QD	deg	QD latitude of WEJ and EEJ equatorward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_EB_QD	deg	QD longitude of WEJ and EEJ equatorward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
MLT_EB	hour	Magnetic Local Time (QD) of WEJ and EEJ equatorward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
t_PB		Time of WEJ and EEJ poleward boundaries in the order as they appear in the satellite flight direction, UTC⁴	2	CDF_EPOCH
Latitude_PB	deg	Geocentric latitude of WEJ and EEJ poleward boundaries in ITRF in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_PB	deg	Geocentric longitude of WEJ and EEJ poleward boundaries in ITRF in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Latitude_PB_QD	deg	QD latitude of WEJ and EEJ poleward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_PB_QD	deg	QD longitude of WEJ and EEJ poleward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
MLT_PB	hour	Magnetic Local Time (QD) of WEJ and EEJ poleward boundaries in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Latitude_B	deg	Geodetic latitude of peaks (minimum and maximum) in ground magnetic field disturbance in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
Longitude_B	deg	Geodetic longitude of peaks (minimum and maximum) in ground magnetic field disturbance in the order as they appear in the satellite flight direction	2	CDF_DOUBLE
B	nT	Maximum (first row) and minimum (second row) of ground magnetic field disturbance. First (second) column gives the north (east) component geodetic frame	[2, 2]	CDF_DOUBLE
Flags		Quality indicator	1	CDF_UINT2

Details

Product identifier

AEJxPBS_2F

Definition

High-latitude ionospheric sheet current boundary locations, the locations of minimum (WEJ) and maximum (EEJ) eastward current density in semiQD¹ frame, the locations of minimum and maximum ground northward magnetic field disturbance (in semiQD¹).

Input Data

MAGx_LR_1B, Latest CHAOS model² including, core, lithosphere, magnetosphere and secondary currents.

Input Time Span

Up to one year

Spatial representation

One geographic and QD latitude/longitude pair for each output value. The Swarm footprints at 110 km altitude have been determined with mapping along the geomagnetic field line.

Time representation

One timestamp for each latitude/longitude pair

Units

Degrees (locations), A/km (for peak currents) and nT (for ground B)

Resolution

Full resolution (Double precision)

Uncertainty

c.f. Juusola et al., doi: 10.1002/2016JA022961

Quality indicator

Note: Flag values are specified in binary. If two or more situations occurs simultaneously, the Flag value will be a sum of the different Flags values. For more information and examples (see SW-DS-GFZ-GS-001_AEBS_DPA, Swarm-AEBS Description of the Processing Algorithm)

Value	Meaning
0000000000000	Both EEJ and WEJ are detected, and their current densities are zero at all boundaries.
0000000000001	No eastward currents detected.
0000000000010	No westward currents detected.
0000000000100	Equatorward EEJ boundary occurs at the edge of the analysis area², and the density is larger than 20% of peak value.
0000000001000	Poleward EEJ boundary occurs at the edge of the analysis area², and the density is larger than 20% of peak value.
0000000010000	Equatorward WEJ boundary occurs at the edge of the analysis area², and the density is larger than 20% of peak value.
0000000100000	Poleward WEJ boundary occurs at the edge of the analysis area², and the density is larger than 20% of peak value.
0000001000000	Swarm orbit does not fully cover the predefined oval latitude range². Latitude gap is 2 degrees or larger.
0000010000000	Equatorward EEJ boundary occurs at the edge of the analysis area².
0000100000000	Poleward EEJ boundary occurs at the edge of the analysis area².
0001000000000	Equatorward WEJ boundary occurs at the edge of the analysis area².
0010000000000	Poleward WEJ boundary occurs at the edge of the analysis area².
0100000000000	Peak value of EEJ occurs at the edge of the analysis area².
1000000000000	Peak value of WEJ occurs at the edge of the analysis area².

Data volume

Up to 6 MB

Data format

CDF

Output time span

Up to one year⁴

Update rate

Daily

Latency

< 1 day

Notes

¹ Horizontal current components will be given both in geographic frame and in a spherical frame whose north pole is defined by the QD frame (SW-DS-GFZ-GS-001_AEBS_DPA, Swarm-AEBS Description of the Processing Algorithm). The latitude and longitude of QD north pole are available in the CDF global attributes Latitude_POLEQD and Longitude_POLEQD respectively. These are vectors of two elements. The 1^st (2^nd) value is for the case when Swarm is in the northern (southern) hemisphere.
² Version information of Input Data are available in the CDF global attributes.
³ QD latitudes from 50 to 85 (Northern hemisphere) or -50 to -85 (Southern hemisphere). Note that Swarm orbits does not always cover this area completely.
⁴ If only eastward current detected timestamps for westward peak and boundaries are set to time of eastward peak and predefined oval boundaries, and vice versa.
⁵ Ground magnetic field caused by the ionospheric currents is determined in the semiQD frame, where its horizontal part has only the North component. Geodetic vector components are derived from the minimum and maximum of that North component.
⁶ Product contain data from the start of the first oval crossing of the year up until the end of the last oval crossing starting that year, i.e., may contain data from the next year if oval crossing occurs around midnight on the last day of the year.

SW_AEJxPBS_2F

Filters

Short product names

SW_AEJxPBS_2F

Description

Data Access

Output variables

Details

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