Kp index archive

Structure of the FTP archive site

As a member of the International Service of Geomagnetic Indices, the GFZ, Adolf-Schmidt-Observatory Niemegk, supplies historical and current Kp and derived indices per anonymous FTP:


Note: FTP site may refuse connections due to excessive traffic.

The kp-ap/ directory contains:

readme.txtASCII text fileA plain text copy of the Geomagnetic Indices www page.
music.exeBinary executable fileA PC executable program for 386 or higher machines. music.exe reads Kp/ap values in WDC format and produces a PostScript file with Bartels Kp music diagram. Download music.exe using binary mode! The data file ssc.dat is also required to run music.exe.
ssc.datASCII text fileList of (storm) sudden commencements (ssc), partly preliminary.
tab/SubdirectoryContains the monthly Kp/ap tables in a simple text format readable for both humans and computers (*.tab). The file tab_fmt.doc provides a format description. The tables distributed by regular mail (PostScript format) are also provided in this directory.
wdc/SubdirectoryContains the monthly (respectively yearly) Kp/ap tables and much more information in condensed tables (ASCII format). The format is nearly identical to the format of Kp/ap tables distributed by the World Data Center A for Solar-Terrestrial Physics. The file wdc_fmt.doc provides a format description. This format does not contain any information on the quiet and most disturbed days as the tables in the tab directory do.
music/SubdirectoryContains the Kp values in the Bartels musical diagram (Postscript format), which is very helpful in visualizing the indices.
Contains tables of the quietest and most disturbed days for all months since Jan 1932. (Values since 1900 also supplied, use with caution.)
kp-freq/SubdirectoryContains tables of frequencies of Kp indices.
ap_monyr.aveASCII text fileA table with monthly and yearly averages of Ap.

Kp index data from this website is distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0)


Dr. Jürgen Matzka

Section 2.3: Geomagnetism

Lindenstr. 7
Gebäude H 1, Raum 213
14823 Niemegk
Tel.: +49 331 33843 624-18