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Van Allen Probe B Electric Fields and Waves (EFW) Spin-fit Electric field in modified-GSE (MGSE) coord, density, and other products

(2022). Van Allen Probe B Electric Fields and Waves (EFW) Spin-fit Electric field in modified-GSE (MGSE) coord, density, and other products [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/p4ze-4247 (CiteAs link). Accessed on .

ResourceID
spase://NASA/NumericalData/RBSP/B/EFW/L3/PT11S

Description

This data set contains Level 3 wave electric field and search coil wave magnetic fields data from the Electric Field and Waves Suite (EFW) onboard Van Allen Probe A. The spin-fit electric field (spin period resolution) tends to be the most accurate electric field measurement. However, as always, due diligence by the user/scientists must be exercised in using these data. The spin-fit electric field is provided in both an inertial and co-rotating frame. The electric field is presented in a MGSE (modified GSE) coordinate system. We provide two components (Y MGSE and Z MGSE) of the electric field. Both components are in the spin plane of the spacecraft and are measured with the long 50 m booms. The X MGSE component is along the spin-axis. The spin-axis of the spacecraft is oriented within 37 degrees of the Earth sun line. So the Y GSE direction is most nearly aligned with the Y MGSE axis and the Z MGSE direction is most nearly aligned with Z GSE.

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Details

Version:2.4.1

NumericalData

ResourceID
spase://NASA/NumericalData/RBSP/B/EFW/L3/PT11S
ResourceHeader
ResourceName
Van Allen Probe B Electric Fields and Waves (EFW) Spin-fit Electric field in modified-GSE (MGSE) coord, density, and other products
DOI
https://doi.org/10.48322/p4ze-4247
ReleaseDate
2022-08-18 12:34:56.789
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2022-08-18 12:34:56.789
Note
Added DOI and PublicationInfo minted by LFB, updated InformationURL URLs as needed, updated the SPDF MetadataContact Person to Robert M. Candey, metadata updated to SPASE 2.4.1, reviewed by LFB 20220818
Description

This data set contains Level 3 wave electric field and search coil wave magnetic fields data from the Electric Field and Waves Suite (EFW) onboard Van Allen Probe A. The spin-fit electric field (spin period resolution) tends to be the most accurate electric field measurement. However, as always, due diligence by the user/scientists must be exercised in using these data. The spin-fit electric field is provided in both an inertial and co-rotating frame. The electric field is presented in a MGSE (modified GSE) coordinate system. We provide two components (Y MGSE and Z MGSE) of the electric field. Both components are in the spin plane of the spacecraft and are measured with the long 50 m booms. The X MGSE component is along the spin-axis. The spin-axis of the spacecraft is oriented within 37 degrees of the Earth sun line. So the Y GSE direction is most nearly aligned with the Y MGSE axis and the Z MGSE direction is most nearly aligned with Z GSE.

Acknowledgement
NASA Space Physics Data Facility (SPDF) CDAWeb. The work by the EFW team was conducted under JHU/APL contract 922613 (RBSP-EFW)
PublicationInfo
Authors
J.R. Wygant
PublicationDate
2022-01-01 00:00:00
PublishedBy
NASA Space Physics Data Facility
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/John.R.Wygant
2.GeneralContactspase://SMWG/Person/Robert.M.Candey
3.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
EFW home page at the University of Minnesota
URL
Description

EFW Data Required Reading

InformationURL
Name
The Van Allen Probes Home Page
URL
Description

Science Gateway (including Mission Rules of the Road for Data Usage)

PriorIDs
spase://VWO/NumericalData/RBSP/B/EFW/L3/PT11S
spase://VSPO/NumericalData/RBSP/B/EFW/L3/PT11S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

In CDF via ftp from CDAWeb

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

Format
CDF
Acknowledgement
Please acknowledge the PI and the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Format
Text
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
RBSPB_EFW-L3
Description

Web Service to this product using the HAPI interface.

Format
CSV
InstrumentIDs
MeasurementType
ElectricField
MeasurementType
Waves
TemporalDescription
TimeSpan
StartDate
2012-09-18 00:00:06.000Z
StopDate
2019-10-18 16:30:00Z
Cadence
PT11S
Parameter #1
Name
Time, UTC
ParameterKey
epoch
Description

Time tags for the data quantities

Units
UTC
Support
SupportQuantity
Temporal
Parameter #2
Name
Density estimation from sc potential
ParameterKey
density
Description

Density estimation from sc potential, determined from the form density = A1exp(bx)+A2exp(cx), where x=(V1 + V2)/2, where the constants are found by comparison to upper hybrid line from EMFISIS. The fit is updated approximately monthly. For a more accurate density (or verification) for a specific time period contact the EFW team. Values below 10cm-3 and above 3000 cm-3 are untrustworthy and are removed

Units
cm-3
Particle
ParticleType
Electron
ParticleQuantity
NumberDensity
Parameter #3
Name
EFW Global Data Quality
ParameterKey
flag_global
Description

0=OK

Structure
Size
20
Support
SupportQuantity
Other
Parameter #4
Name
EFW Data Quality Flags
ParameterKey
flags_all
Description

The quality of EFW data products can be affected by a variety of observatory and instrument-level conditions. efw_qual is a collection of flags that show the estimate of each of these contributors over time. ..See the EFW-FAQ (http://www.space.umn.edu/rbspefw-data-policy-the-rules-of-the-road/) for a detailed description of the determination and meaning of each of the elements of efw_qual...If the value of a particular element of efw_qual is not relevant to the quality of a particular data product, it shall receive the value -2...If the value of a particular element of efw_qual is relevant to the quality of a particular data product but is not known at the time lf L2 data production, it shall receive the value -1...A quality value of 0 indicates that there are no known issues with the data product due to that particular element of efw_qual...The quality values are meant to be conservative, and values other than 0 should lead the user back to a member of the EFW instrument team for discussion and advice on the nature of the data quality as needed.

Structure
Size
20
Support
SupportQuantity
Other
Parameter #5
Name
Charging, Bias and Eclipse flags
ParameterKey
flags_charging_bias_eclipse
Description

For Spacecraft Charging Issues see http://www.space.umn.edu/rbspefw-data-policy-the-rules-of-the-road/

Support
SupportQuantity
Other
Parameter #6
Name
Ein - Inertial frame spinfit electric field in MGSE coord system
ParameterKey
efield_inertial_frame_mgse
Description

Inertial frame spinfit electric field in MGSE coord system. Derived from the V1 and V2 spinplane booms. The Vsc x B field is subtracted off, where Vsc is the spacecraft velocity and B is the measured ambient magnetic field

Units
mV/m
Structure
Size
3
Field
FieldQuantity
Electric
Parameter #7
Name
Eco - Corotation frame spinfit electric field in MGSE coord system
ParameterKey
efield_corotation_frame_mgse
Description

Corotation frame spinfit electric field in MGSE coord system. Derived from the V1 and V2 spinplane booms. The Vsc x B field is subtracted off, where Vsc is the spacecraft velocity and B is the measured ambient magnetic field

Units
mV/m
Structure
Size
3
Field
FieldQuantity
Electric
Parameter #8
Name
Vco x B - Corotation vxB Efield in MGSE coord.
ParameterKey
VcoroxB_mgse
Description

Corotation Efield calculated from Omega x R x B in MGSE coord. Omega is the Earth's spin axis vector and R is the vector from the Earth's center to the satellite

Units
mV/m
Structure
Size
3
Field
FieldQuantity
Electric
Parameter #9
Name
Vsc x B - Spacecraft vxB Efield calculated in MGSE coord.
ParameterKey
VscxB_mgse
Description

Vsc x B in MGSE coord, where Vsc is the spacecraft velocity and B is the DC magnetic field

Units
mV/m
Structure
Size
3
Field
FieldQuantity
Electric
Parameter #10
Name
GSE position (km) from SPICE
ParameterKey
pos_gse
Description

GSE position (km) from SPICE

Units
km
Structure
Size
3
Support
SupportQuantity
Positional
Parameter #11
Name
GSE velocity in km/s from SPICE
ParameterKey
vel_gse
Description

GSE position (km) from SPICE

Units
km/s
Structure
Size
3
Support
SupportQuantity
Velocity
Parameter #12
Name
Spinaxis unit vector in GSE coord
ParameterKey
spinaxis_gse
Description

Spinaxis unit vector in GSE coord

Structure
Size
3
Support
SupportQuantity
Positional
Parameter #13
Name
Vavg - SCpot (neg) as average of opposing boom potentials (V1+V2)/2 and a proxy for plasma density.
ParameterKey
Vavg
Description

Average of opposing boom potentials (V1+V2)/2. This is a proxy for plasma density. Positive excursions can indicate negative spacecraft charging.

Units
volts
Field
FieldQuantity
Potential
Parameter #14
Name
MLT, Lshell and Mlat
ParameterKey
mlt_lshell_mlat
Description

MLT, Lshell and Mlat

Structure
Size
3
Support
SupportQuantity
Positional
Parameter #15
Name
Nominal Sensor Saturation Voltage (V)
ParameterKey
vsvy_maxval
Description

The maximum magnitude of the sensor potential relative to SC potential at which the sensor preamp likely to be saturated during nominal biasing conditions..If the magnitude of a given sensor potential exceeds vsvy_maxval then the corresponding element of efw_qua.l (v1_saturation .. v6-saturation) shall be set to indicate that state. vsvy_maxval is set in the L1>L2 processing scripts, and shall be copied into this variable during L2 CDF creation.

Support
SupportQuantity
Other
Parameter #16
Name
EFW_QUAL_NR
ParameterKey
EFW_QUAL_NR
Description

EFW_QUAL_NR is the value (typ. -2) an element of efw_qual takes when the criterion represented by that element is not relevant for the given data product.

Support
SupportQuantity
Other
Parameter #17
Name
EFW_QUAL_GOOD
ParameterKey
EFW_QUAL_GOOD
Description

EFW_QUAL_GOOD is the value (0) of an element of efw_qual that indicates good data.

Support
SupportQuantity
Other
Parameter #18
Name
EFW_QUAL_UNK
ParameterKey
EFW_QUAL_UNK
Description

EFW_QUAL_UNK is the value (typ. -1) an element of efw_qual that indicates the quality is unknown.

Support
SupportQuantity
Other