National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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

The 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 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.

Cite this dataset when used as a source.

Search and Download
  • K Indices (download)
    FTP site of K Indices for download
Distribution Formats
  • ASCII
Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Point of Contact Don Herzog
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
303 497 6135
justin.mabie@noaa.gov
Documentation links not available.
Originator
  • User Services
    DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Originator
  • User Services
    DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Publisher
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Date(s)
  • publication: 1957-01-01
Edition: First
Dataset Progress Status Under development
Data Update Frequency: Irregular
Purpose: Magnetic Activity Research
Use Limitations
  • While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Time Period: 1938-01-01  to  Present
Spatial Bounding Box Coordinates:
N: 90.000000
S: -90.000000
E: 180.000000
W: -180.000000
Spatial Coverage Map:
Themes
  • EARTH SCIENCE > SOLID EARTH > Geomagnetism > Geomagnetic Indices
  • Earth Science > Interior & Crust
  • Geomagnetism
  • Earth Science > Land
  • WDC/STP, BOULDER > World Data Center for Solar-Terrestrial Physics, Boulder
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Places
  • Global
Use Constraints
  • Use Constraints: None
Access Constraints
  • Access Constraints: No Constraints
Fees
  • No cost for download
Lineage Statement Lineage statement not available.
Processing Steps
  • Mission Start Date

Metadata Last Modified: 2013-05-24

For questions about the information on this page, please email: Justin.Mabie@noaa.gov