The figure below shows IMF azimuthal angles computed from daily averages of hourly GSE X and Y IMF components as contained in the OMNI data set. Blue denotes angles in the range 90-180 deg., typical away or positive polarity. Red denotes angles in the range 270-360 deg., typical toward or negative polarity. Yellow denotes angles in either of the other two azimuthal quadrants. White means no data. Data for two successive solar rotations (54 days) are shown on each line. The data for one solar rotation are shown on the right side of one 54-day line and on the left side of the next line. Further display options are given below the plot.
To view an alternative version of this figure with most recent data at the top rather than bottom, click HERE.
For a version of this which lets you see the time of any feature, click HERE.
Any use of the IMF polarity plot(s) for presentations or publications should acknowledge the National Space Science Data Center.
We thank Vladimir Papitashvili, U. Michigan, for fruitful discussions about this figure. - JHK & NEP