Operational News
March 2021
DOI and new scientific paper for Kp-Index
Kp was assigned a DOI and a dataset publication (Matzka, J., Bronkalla, O., Tornow, K., Elger, K. and Stolle, C., 2021. Geomagnetic Kp index, V. 1.0. GFZ Data Services,
doi.org/10.5880/Kp.0001
).
A new scientific publications (Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., 2021. The geomagnetic Kp index and derived indices of geomagnetic activity, Space Weather,
doi.org/10.1029/2020SW002641
) describes the Kp index and serves as reference for the DOI.
Since January 2020
Warning about ambiguous file names in 2020
Since January 2020, the conventional filenames for the Kp index in the WDC format would have become ambiguous on our server ftp://ftp.gfz-potsdam.de/pub/home/obs/kp-ap/wdc/ as Kp2001.wdc could mean a monthly file for January 2020 or a yearly file for the year 2001. Therefore are all yearly files on the FTP server available from the subdirectory 'yearly'.
Please find the correspondingly updated format description here: ftp://ftp.gfz-potsdam.de/pub/home/obs/kp-ap/wdc/wdc_fmt.txt
Despite the fact that each line in these files has its own, correct time stamp, we noticed that some of our users, depending on how they reformat the downloaded data files, have produced corrupted files on their side as a consequence of the filename ambiguity and our mitigation steps. We recommend our users to check their reformatted files, especially for the early 2000s and the early months of 2020 and especially if they are not sure how their downloading and reformatting algorithm deals with the filename ambiguity.
Warning about ambiguous file names in 2020
Since January 2020, the conventional filenames for the Kp index in the WDC format would have become ambiguous on our server ftp://ftp.gfz-potsdam.de/pub/home/obs/kp-ap/wdc/ as Kp2001.wdc could mean a monthly file for January 2020 or a yearly file for the year 2001. Therefore are all yearly files on the FTP server available from the subdirectory 'yearly'.
Please find the correspondingly updated format description here: ftp://ftp.gfz-potsdam.de/pub/home/obs/kp-ap/wdc/wdc_fmt.txt
Despite the fact that each line in these files has its own, correct time stamp, we noticed that some of our users, depending on how they reformat the downloaded data files, have produced corrupted files on their side as a consequence of the filename ambiguity and our mitigation steps. We recommend our users to check their reformatted files, especially for the early 2000s and the early months of 2020 and especially if they are not sure how their downloading and reformatting algorithm deals with the filename ambiguity.
Publications with descriptions of the K and Kp indices
- Siebert M. and Meyer, J., 1996. Geomagnetic Activity Indices. In: Dieminger, W., Hartmann, W. and Leitinger, G.K. (Eds.), The Upper Atmosphere, Springer, Berlin Heidelberg, ISBN 978-3-642-78717-1, 887-911
- Rangarajan, G.K., 1987. Indices of geomagnetic activity. In: Jacobs, J.A. (Ed.), Geomagnetism, 3, Academic Press, ISBN 0-12-378673-8, 323-384
- Mayaud, P.N., 1980. Derivation, Meaning, and Use of Geomagnetic Indices. Geophysical Monograph Serie, Volume 22, American Geophysical Union, ISBN:9780875900223, https://doi.org/10.1029/GM022
- Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O., & Morschhauser, A., 2021. The geomagnetic Kp index and derived indices of geomagnetic activity. Space Weather, 19, e2020SW002641, https://doi.org/10.1029/2020SW002641
- Matzka, J., Bronkalla, O., Tornow, K., Elger, K. and Stolle, C. (2020): Geomagnetic Kp index. V. 1.0. GFZ Data Services. https://doi.org/10.5880/Kp.0001
- Bartels, J., 1957b. The geomagnetic measures for the time-variations of solar corpuscular radiation, described for use in correlation studies in other geophysical fields, Ann. Intern. Geophys. Year 4, 227-236, https://doi.org/10.1016/b978-1-4832-1304-0.50007-5
- Bartels, J., 1957a. The technique of scaling indices K and Q of geomagnetic activity, Ann. Intern. Geophys. Year 4, 215-226
- Bartels, J., 1949, The standardized index, Ks, and the planetary index, Kp, IATME Bull., 12b, 97-120.
- Bartels, J, Heck, N.H. and Johnston, H.F., 1940. Geomangetic three-hour range indices for the years 1938 and 1939. Terr. Magn. Atmos. Electr., 45 (3), 309-337, https://doi.org/10.1029/TE045i003p00309
- Bartels, J., Heck, N.H. and Johnston, H.F., 1939. The three-hour-range index measuring geomagnetic activity. Terr. Magn. Atmos. Electr., 44 (4), p. 411-454, https://doi.org/10.1029/TE044i004p00411
- Bartels, J. and Johnston, H.F., 1939. Main features of daily magnetic variations at Sitka, Cheltenham, Tucson, San Juan, Honolulu, Huancayo, and Wateroo. Terr. Mag. 44, p 455 - 469, https://doi.org/10.1029/TE044i004p00455
- Bartels, J., 1939. Potsdamer erdmagnetische Kennziffern, 4. Mitteilung. Zeitschr. f. Geophys. 15, 214-221, https://doi.org/10.23689/fidgeo-3179
- Bartels, J., 1938. Potsdamer erdmagnetische Kennziffern, 1. Mitteilung. Zeitschr. f. Geophys. 14, 68-78, https://doi.org/10.23689/fidgeo-3165