COPYING.gfz

GFZ provides Kp and its derived indices and the figures on this website with
the Creative Commons Attribution 4.0 International (CC BY 4.0) license
(see file COPYING.CCby4.0 or online version at https://creativecommons.org/licenses/by/4.0/).
Please refer to GFZ German Research Centre for Geosciences as data source.
GFZ contributes with Kp to the International Service of Geomagnetic Indices (ISGI) of IAGA.
The indices and their provision (including a data publication with DOI)
are described in Matzka et al. (2021) [1].

[1] Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O., & Morschhauser, A. (2021),
The geomagnetic Kp index and derived indices of geomagnetic activity,
Space Weather, volume 19, issue 5, e2020SW002641. https://doi.org/10.1029/2020SW002641

data doi: 10.5880.Kp.0001
url: https://datapub.gfz-potsdam.de/download/10.5880.Kp.0001/