

MissionsPolarProductsKey Parameter Desc.  
MFE Key Parameters Description  
The MFE Key Parameters are generated at UCLA from the sun crossing vector data every 6 sec in the spacecraft level zero telemetry stream. They are calculated at .92 minute resolution except as noted for parameters 9, 10, 11 and 12. Key Parameter Descriptions
The standard CDHF time in daymonthhourminsec.msec. It is the center point of each 0.92 min interval. The standard CDHF time in daymonthhourminsec.msec. It is the sun crossing time. The standard CDHF epochtime in yearday of yearsec. It is the center point of each 0.92 min interval. The spacecraft position vector at the epochtime in GSE coordinates (x toward the Sun, y in the ecliptic plane in the direction of Earth's orbital motion, z perpendicular to the ecliptic plane) in Earth radii (R_{E}). The Y and Z components of the spacecraft position at the epochtime in GSM coordinates (x toward the Sun, xz plane contains the Earth's dipole axis, y completing the righthanded system) in Earth radii (R_{E}). XGSM=XGSE. The X and Z components of the spacecraft position at the epochtime in SM coordinates (z is along the Earth's dipole axis) in Earth radii (R_{E}). YSM=YGSM. The spacecraft radial distance from the center of the Earth in Earth radii (R_{E}). The tilt angle in degrees of the Earth's dipole axis using dipole moment of date (IGRF95 model with secular correction). The major frame number for all the 9.2 sec major frames of the day The time of the first vector in each major frame of the day. The measured field magnitude at the spacecraft, obtained from the sums of the squares of the 6 sec sun crossing data. The measured field vector (components) in spacecraft coordinates (x in the spin plane along the projection of the solar direction, z along the spacecraft spin axis, y completing the righthanded system) at suncrossing time. The compressional standard deviation of the magnetic field in nT calculated over a 1.84 min window (centered at 0.92 min Epoch time) using the 6 sec suncrossing data. The transverse standard deviation of the field in nT over a 1.84 min window (centered at 0.92 min Epoch time) using the 6 sec suncrossing data. It is the square root of the sum of the variance in the X, Y, and Z directions less the compressional variance. The average magnitude of the magnetic field over 1.84min window centered at Epochtime (every 0.92 min) from 6 sec suncrossing data. The observed field vector tansformed to GSE coodinates averged over 1.84min window centered at Epochtime (every 0.92 min) from 6 sec suncrossing data. The By and Bz components of the observed field vector tansformed to GSM coodinates averged over 1.84min window centered at Epochtime (every 0.92 min) from 6 sec suncrossing data. BxGSM=BxGSE. The Bx and Bz components of the observed field vector tansformed to SM coodinates averged over 1.84min window centered at Epochtime (every 0.92 min) from 6 sec suncrossing data. BySM=ByGSM. The IGRF magnetic field magnitude in nT calculated at the epoch of the measuremment using the IGRF95 and secular terms. The value is calculated every 6 s and averaged over the 1.84min window centered at the epochtime. The IGRF magnetic field in nT in GSE coordinates calculated at the epoch of the measuremment using the IGRF95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84min window centered at the epochtime. The Y and Z components of IGRF magnetic field in nT in GSM coordinates calculated at the epoch of the measuremment using the IGRF95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84min window centered at the epochtime. The X and Z components of IGRF magnetic field in nT in SM coordinates calculated at the epoch of the measuremment using the IGRF95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84min window centered at the epochtime. The magnetic field magnitude from the IGRF95 field model plusTsyganenko 1995 empirical magnetosphere field model using the tilt of the dipole and fixed Dst=0, solar wind dynamic pressure =2 nPa. The value is calculated every 6 s and averaged over the 1.84min window centered at the epochtime. The magnetic field in nT in GSE coordinates from the IGRF95 plus Tsyganenko 1995 empirical magnetosphere field model using the tilt of the dipole and fixed Dst=0, solar wind dynamic pressure =2 nPa. The values are calculated every 6 s and averaged over the 1.84min window centered at the epochtime. The Y and Z components of magnetic field in nT in GSM coordinates from the IGRF95 plus Tsyganenko 1995 empirical magnetosphere field model using the tilt of the dipole and fixed Dst=0, solar wind dynamic pressure =2 nPa. The values are calculated every 6 s and averaged over the 1.84min window centered at the epochtime. The X and Z components of magnetic field in nT in SM coordinates from the IGRF95 plus Tsyganenko 1995 empirical magnetosphere field model using the tilt of the dipole and fixed Dst=0, solar wind dynamic pressure =2 nPa. The values are calculated every 6 s and averaged over the 1.84min window centered at the epochtime. The northern latitude and longitude (in GEO) of the foot print of the field line that passes through the spacecraft location at the epochtime in the IGRF95+TSY95 model. The number of 6 s values contributing to each 1.84min period used for key Parameter calculation. Data flag that equals 1 at the first value after a data gap.


