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The JavaFx platform includes components that support creation of several types of charts for visualizing data.  In this series of articles I'll take a look at how the charting components can be used to display data that changes over time. 

For example, the bar chart below is displaying the Planetary K Index for the last four days. The Planetary K index shows the disturbance of the geomagnetic field measured by an instrument called a magnetometer. The K-index scale has a range from 0 to 9 and is directly related to the maximum amount of fluctuation (relative to a quiet day) of the geomagnetic field over a three-hour interval. The estimated Kp index is computed by the United States Airforce Weather Agency and distributed to the public by the NOAA Space Weather Prediction Center in Boulder, CO.

The Kp index is useful information for people who are interested in viewing aurora. The higher the index the further south the aurora may be observed.