Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Magnetic Indices

  • Jeffrey J. Love
  • K. J. Remick
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_178
Magnetic indices are simple measures of magnetic activity that occurs, typically, over periods of time of less than a few hours and which is recorded by magnetometers at ground‐based observatories (Mayaud, 1980; Rangarajan, 1989; McPherron, 1995). The variations that indices measure have their origin in the Earth's ionosphere and magnetosphere. Some indices having been designed specifically to quantify idealized physical processes, while others function as more generic measures of magnetic activity. Indices are routinely used across the many subdisciplines in geomagnetism, including direct studies of the physics of the upper atmosphere and space, for induction studies of the Earth's crust and mantle, and for removal of disturbed‐time magnetic data in studies of the Earth's deep interior and core. Here we summarize the most commonly used magnetic indices, using data from a worldwide distribution of observatories, those shown in Figure M31and whose sponsoring agencies are given in...
This is a preview of subscription content, log in to check access.

Bibliography

  1. Bartels, J., 1938. Potsdamer erdmagnetische Kennziffern, 1 Mitteilung. Zeitschrift für Geophysik, 14: 68–78, 699–718.Google Scholar
  2. Davis, T.N., and Sugiura, M., 1966. Auroral electrojet activity index AE and its universal time variations. Journal of Geophysical Research, 71: 785–801.Google Scholar
  3. Mayaud, P.N., 1980. Derivation, Meaning, and Use of Geomagnetic Indices, Geophysical Monograph 22. Washington, DC: American Geophysical Union.Google Scholar
  4. McPherron, R.L., 1995. Standard indices of geomagnetic activity. In Kivelson, M.G., Russell, C.T. Introduction to Space Physics. Cambridge, UK: Cambridge University Press, pp. 451–458.Google Scholar
  5. Menvielle, M., and Berthelier, A., 1991. The K‐derived planetary indices—description and availability. Reviews of Geophysics, 29: 415–432.Google Scholar
  6. Moos, N.A.F., 1910. Colaba Magnetic Data, 1846 to 1905. 2. The Phenomenon and its Discussion. Bombay, India: Central Government Press.Google Scholar
  7. Rangarajan, G.K., 1989. Indices of geomagnetic activity. In Jacobs, J.A. (ed.), Geomagnetism, Vol. 2. London, UK: Academic Press, pp. 323–384.Google Scholar
  8. Sugiura, M., 1964. Hourly values of equatorial D st for the IGY. Annals of the International Geophysical Year, 35: 945–948.Google Scholar
  9. Thomsen, M.F., 2004. Why K p is such a good measure of magnetospheric convection. Space Weather, 2: S11004, doi:10.1029/2004SW000089.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Jeffrey J. Love
  • K. J. Remick

There are no affiliations available