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One-Hour Averaged Plots


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

Time span: 1973-11-03 to 1974-09-18


This data set consists of color plots of one-hour averages of interplanetary magnetic field (IMF) parameters vs. the Carrington rotation number and the Carrington longitude of the subspacecraft point. The plots are from the data set of 73-085A-04P.

The magnitude of each IMF parameter is color coded as indicated above the plot. Each number shows the upper limit of the parameter in that color range; e.g., IMF energy densities from 1.91E-10 to 2.6E-10 are plotted in green. Lowest energies are in purple and the highest are in red. For the component data, the same scheme applies except that the passband limits are lower limits in the case of negative values, and zero is at the center. Each one-hour average data point is plotted 1 pixel wide and 3 pixels high. A blank line 3 pixels high is left between data lines.

The parameters include BXSE NT which equals the component of IMF along the X-axis in the solar equatorial system, positive toward the sun, in nanoteslas. Similarly, BYSE NT is along the Y-axis, BZSE NT is along the Z-axis, BTOT NT is the IMF vector, and MAG. ED is the IMF energy density in ergs/cc. Blank areas are data gaps. The Carrington longitude decreases as a function of time, thus the start of each line is at the right. Therefore, the rotation and year are correct at the right end. The rotation number given is the one seen by an earth-based observer at the start of the one-hour average data accumulation interval.


  • NASA Space Science Data Coordinated Archive


  • Planetary Science: Fields and Particles
  • Space Physics: Heliospheric Studies


  • 73-085A-04Q

Additional Information



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



NameRoleOriginal AffiliationE-mail
Dr. John W. FreemanGeneral ContactNASA Goddard Space Flight Center 
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