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Angles and Electric Field Plots from ISEE 3 Data Pool Data on Microfiche


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1978-08-12 to 1984-03-02


Each frame of this microfiche data set contains 24-h plots of five parameters related to the solar wind and interplanetary magnetic field, and it is labeled with the start and end dates, the date of the production, the corresponding ISEE 1 and 2 orbit number and orbital phase, and the ISEE 3 position at the start of the plot in GSE and GSM coordinates in units of earth radii. The top panel is designed to indicate the sector polarity. It is the dot product of the nominal Parker spiral direction (direction cosines are: .707, -.707, 0) and the magnetic field direction. Positive values denote toward sectors and negative values away sectors. The second panel shows the cone angle (alpha), which is the angle between the solar direction and the magnetic field direction. The next panel, beta, is the orthogonal angle, i.e., the azimuth about the solar direction, measured in GSM coordinates with beta=0 deg along the positive Y direction and beta=90 deg along the positive Z direction. To minimize rollover of angles near + or -180 deg, the plot extends above 180 deg and below -180 deg if the previous point is close to + or -180 deg. The next panel labeled ZGSB, is the distance (earth radii) of ISEE 3 above the VB plane that contains the earth. (The VB plane is the plane containing both the solar wind velocity vector and the magnetic field direction.) This distance is important in using ISEE 3 to correlate with terrestrial data because it measures the distance between the earth and ISEE 3 perpendicular to the magnetic field, and the correlation length across the field is thought to be small (20 Re). The bottom panel is simply V Bz, in mV/m, which approximates Ey in GSM coordinates, the dawn to dusk electric field. Positive values are the geoeffective ones.


  • Space Physics: Heliospheric Studies
  • Space Physics: Magnetospheric Studies


  • 78-079A-02H

Additional Information



Questions or comments about this data collection can be directed to: Dr. H. Kent Hills.



NameRoleOriginal AffiliationE-mail
Dr. Christopher T. RussellGeneral ContactUniversity of California, Los
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