The 3-hourly KGBI index is a regional version of the planetary Kp magnetic activity index. It is based on a quasi-logarithmic 28 point scale, ranging from 0 to 9, with sub-divisions of one third between each whole value.

The KGBI index forecasts are for the next 72 hours (or 3 days). They are derived from auto-regressive, integrated, moving-average (ARIMA) linear models built using the KGBI time series as input.

The forecast models are normally re-run every 10 minutes as the most recent KGBI (estimates and nowcast) are updated. The plot of the forecast shows a mixture of forecast and estimated data. A grey background is shown on the plot to indicate the section of data that is not a forecast.

Main page

To select the data set you want to see, and the range of dates and/or times you want to see it over, click the Select Data button and enter the relevant information in the dialog.

For data sets that can be viewed at different dates and/or times, use the Previous and Next buttons to step backward and forward by the date/time range currently shown on the page. Use the Most Recent button to see the most recently available data. The Next and Most Recent buttons will be disabled when the most recent data is displayed. The Previous button will be disabled when the page is showing the earliest data available for the current data set.

Select Data dialog

Select the data set you want to see from the drop-down menu.

Where applicable, select the observatory (observatories) or region(s) from the drop-down menu.

Where applicable, enter two dates/times separated by '-' in the input box to specify the date/time you want to see. Alternatively, select a date/time range using the date picker.