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


  1. Epoch-time (Epoch, 0.92 min)

  2. The standard CDHF time in day-month-hour-min-sec.msec. It is the center point of each 0.92 min interval. 
  3. Epoch6-time (Epoch6, 6 s)

  4. The standard CDHF time in day-month-hour-min-sec.msec. It is the sun crossing time.
  5. PB5-time (Time_PB5, 0.92 min):

  6. The standard CDHF epoch-time in year-day of year-sec. It is the center point of each 0.92 min interval. 
  7. Position-GSE (POS_GSE, 0.92 min):

  8. The spacecraft position vector at the epoch-time 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 (RE). 
  9. Position-GSM (POS_GSM, 0.92 min):

  10. The Y and Z components of the spacecraft position at the epoch-time in GSM coordinates (x toward the Sun, x-z plane contains the Earth's dipole axis, y completing the right-handed system) in Earth radii (RE). XGSM=XGSE. 
  11. Position-SM (POS_SM, 0.92 min):

  12. The X and Z components of the spacecraft position at the epoch-time in SM coordinates (z is along the Earth's dipole axis) in Earth radii (RE). YSM=YGSM. 
  13. Radial Distance (Rad_Dist, 0.92 min):

  14. The spacecraft radial distance from the center of the Earth in Earth radii (RE). 
  15. Dipole Tilt Angle (TILT, 0.92 min):

  16. The tilt angle in degrees of the Earth's dipole axis using dipole moment of date (IGRF95 model with secular correction). 
  17. Major Frame Number  (MF_Mum, 9.2 sec): 

  18. The major frame number for all the 9.2 sec major frames of the day
  19. Major Frame Timing (MF_Timing, 9.2 sec) 

  20. The time of the first vector in each major frame of the day.
  21. Magnetic Field Strength (BT, 6sec):

  22. The measured field magnitude at the spacecraft, obtained from the sums of the squares of the 6 sec sun crossing data. 
  23. Vector Magnetic Field in S/C Frame (BSC, 6 sec)

  24. 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 right-handed system) at sun-crossing time.
  25. Compressional Standard Deviation (COMP_DELTA, 0.92 min)

  26. 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 sun-crossing data. 
  27. Transverse Standard Deviation (TRANS_DELTA, 0.92 min)

  28. 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 sun-crossing data. It is the square root of the sum of the variance in the X, Y, and Z directions less the compressional variance. 
  29. Average Magnetic Field Strength (BTAV, 0.92 min):

  30. The average magnitude of the magnetic field over 1.84-min window centered at Epoch-time (every 0.92 min) from 6 sec sun-crossing data. 
  31. Vector Field-GSE (B_GSE, 0.92 min):

  32. The observed field vector tansformed to GSE coodinates averged over 1.84-min window centered at Epoch-time (every 0.92 min) from 6 sec sun-crossing data. 
  33. Vector Field-GSM (B_GSM, 0.92 min)

  34. The By and Bz components of the observed field vector tansformed to GSM coodinates averged over 1.84-min window centered at Epoch-time (every 0.92 min) from 6 sec sun-crossing data. BxGSM=BxGSE. 
  35. Vector Field-SM (B_SM, 0.92 min): 

  36. The Bx and Bz components of the observed field vector tansformed to SM coodinates averged over 1.84-min window centered at Epoch-time (every 0.92 min) from 6 sec sun-crossing data. BySM=ByGSM. 
  37. Model Field Strength-IGRF (MBTIGRF, 0.92 min):

  38. The IGRF magnetic field magnitude in nT calculated at the epoch of the measuremment using the IGRF-95 and secular terms. The value is calculated every 6 s and averaged over the 1.84-min window centered at the epoch-time. 
  39. Model Field-IGRF GSE (MBCIGRF_GSE, 0.92 min):

  40. The IGRF magnetic field in nT in GSE coordinates calculated at the epoch of the measuremment using the IGRF-95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84-min window centered at the epoch-time. 
  41. Model Field-IGRF GSM (MBCIGRF_GSM, 0.92 min):

  42. The Y and Z components of IGRF magnetic field in nT in GSM coordinates calculated at the epoch of the measuremment using the IGRF-95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84-min window centered at the epoch-time. 
  43. Model Field-IGRF SM (MBCIGRF_SM, 0.92 min):

  44. The X and Z components of IGRF magnetic field in nT in SM coordinates calculated at the epoch of the measuremment using the IGRF-95 and secular terms. The values are calculated every 6 sec and averaged over the 1.84-min window centered at the epoch-time. 
  45. Model Field Strength-IGRF95+TSY95 (MBTSY, 0.92 min) 

  46. The magnetic field magnitude from the IGRF-95 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 1.84-min window centered at the epoch-time. 
  47. Model Vector Field-IGRF95+TSY95 GSE (MBCTSYGSE, 0.92 min):

  48. The magnetic field in nT in GSE coordinates from the IGRF-95 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 1.84-min window centered at the epoch-time. 
  49. Model Vector Field-IGRF95+TSY95 GSM (MBCTSYGSM, 0.92 min):

  50. The Y and Z components of magnetic field in nT in GSM coordinates from the IGRF-95 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 1.84-min window centered at the epoch-time. 
  51. Model Vector Field-IGRF95+TSY95 SM (MBCTSYSM, 0.92 min):

  52. The X and Z components of magnetic field in nT in SM coordinates from the IGRF-95 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 1.84-min window centered at the epoch-time. 
  53. Northern Polar Foot Print (N_FOOT_PRINT, 0.92 min)

  54. The northern latitude and longitude (in GEO) of the foot print of the field line that passes through the spacecraft location at the epoch-time in the IGRF-95+TSY-95 model.
  55. Southern Polar Foot Print (S_FOOT_PRINT, 0.92 min)
    The southern latitude and longitude (in GEO) of the foot print of the field line that passes through the spacecraft location at the epoch-time in the IGRF-95+TSY-95 model.
  56. Sampling Interval Deviation (dt_var, 0.92 min):
    Deviation of the actual sampling interval dt from the ideal sampling interval of 120,000 microsecond (120 millisecond). dt_var=dt-120,000 (microsecond)
  57. Data Quality Flag (DQF, 0.92 min):

  58. The number of 6 s values contributing to each 1.84-min period used for key Parameter calculation. 
  59. Data Gap Flag (POST_GAP, 0.92 min):

  60. Data flag that equals 1 at the first value after a data gap. 


 

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