This data was collected on day 259 (September 16) of 1999. The top plot shows the magnitude of the magnetic field (|B|) versus time. The lower two plots show the root-mean-square (RMS) values for the X and Y components, respectively, of the magnetic field versus time. The RMS is a measure of the variability or scatter in the data which is used to evaluate the quality of the data. The diamonds on the x-axis mark the times of crossing of the descending node (think of them as orbit separators).
Contributors: David Brain, Monte Kaelberer, and Cisco Perin