The high cadence, open-ended Hpo indices is similar to the Kp index, but have a time resolution of 30 and 60 minutes, called the Hp30 and Hp60, respectively. The Hpo indices were developed in the H2020-project Swami. Hpo goes back to 1995. It is accompanied by the linear apo indices referred to as ap30 and ap60.
We acknowledge the following geomagnetic observatories and the institutes that maintain them for providing data that allow us to calculate Hpo:
All index data and graphs on this website are subject to the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Please refer to GFZ German Research Centre for Geosciences as data source for the Hpo data files and plots.
July 2020: On this website, we are currently establishing links for data download for the Hpo and apo indices. A description of the index will follow.