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.
Version:2.2.9
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.
| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/John.R.Wygant |
| 2. | GeneralContact | spase://SMWG/Person/Robert.E.McGuire |
EFW Data Required Reading
Science Gateway (including Mission Rules of the Road for Data Usage)
In CDF via ftp from CDAWeb
In CDF via HTTP from SPDF
Time tags for the data quantities
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
0=OK
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.
For Spacecraft Charging Issues see http://www.space.umn.edu/rbspefw-data-policy-the-rules-of-the-road/
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
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
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
Vsc x B in MGSE coord, where Vsc is the spacecraft velocity and B is the DC magnetic field
GSE position (km) from SPICE
GSE position (km) from SPICE
Spinaxis unit vector in GSE coord
Average of opposing boom potentials (V1+V2)/2. This is a proxy for plasma density. Positive excursions can indicate negative spacecraft charging.
MLT, Lshell and Mlat
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.
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.
EFW_QUAL_GOOD is the value (0) of an element of efw_qual that indicates good data.
EFW_QUAL_UNK is the value (typ. -1) an element of efw_qual that indicates the quality is unknown.