K Indices of Magnetic Activity Relative to an assumed Quiet-day for each 3-Hour Period

Description

The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) receives the K indices on a current basis from approximately 85 observatories. The K index is a quasi-logarithmic local index of the 3-hourly range in magnetic activity relative to an assumed quiet-day curve for the recording site. First introduced by J. Bartels in 1938, it consists of a single digit 0 through 9 for each 3-hourly interval. The K indices are received on a monthly basis from the various observatories and are available from 1938 to present. The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) also receives KP indices from the Institute for Geophysik in Gottingen, Germany on a monthly basis. The KP index is a planetary index based on the K index from 12 or 13 selected stations and has been derived routinely from 1932.

Resources

Name Format Description Link
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
0 FTP site of K Indices for download ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/RELATED_INDICES/K_INDICES
0 ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/RELATED_INDICES/K_INDICES
21 Home page for magnetic K, Kp, and ap indices https://www.ngdc.noaa.gov/stp/geomag/kp_ap.html
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords

Tags

  • international council for science - world data system
  • geomagnetic indices
  • nesdis
  • icsu-wds
  • national geophysical data center
  • noaa
  • global
  • interior & crust
  • u.s. department of commerce
  • earth science
  • doc/noaa/nesdis/ngdc
  • solid earth
  • doc/noaa/nesdis/ncei
  • land
  • geomagnetism
  • national centers for environmental information

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