K Index of magnetic activity in the Antarctic

  1. A. H. Waynick
  1. Gerald F. Rourke

Published Online: 14 MAR 2013

DOI: 10.1029/AR004p0123

Geomagnetism and Aeronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise

Geomagnetism and Aeronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise

How to Cite

Rourke, G. F. (1965) K Index of magnetic activity in the Antarctic, in Geomagnetism and Aeronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise (ed A. H. Waynick), American Geophysical Union, Washington, D. C.. doi: 10.1029/AR004p0123

Author Information

  1. Research and Advanced Development Division, AVCO Corporation, Wilmington, Massachusetts

Publication History

  1. Published Online: 14 MAR 2013
  2. Published Print: 1 JAN 1965

ISBN Information

Print ISBN: 9780875901046

Online ISBN: 9781118664537

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Keywords:

  • Aurora;
  • Magnetic activity;
  • Method of K-index analysis;
  • Solar particle radiation;
  • Winter diurnal variation

Summary

Based on a study of the K index at thirteen antarctic magnetic observatories, the geographic distribution of magnetic activity is examined. Days of the month are ranked according to the degree of activity, and analysis is performed on all days, quiet days, and disturbed days. Times of maxima in the winter, summer, and yearly diurnal variations are shown in addition to the monthly mean variations. Latitudinal variations in activity are best described as a function of distance from the auroral zone rather than in geomagnetic or geographic coordinates. Seasonal movements of the auroral zone width change the relative position of the Stagg transition zone. Winter and summer maxima in magnetic activity are dependent on geomagnetic time and occur at geomagnetic noon and midnight. This dependence on geomagnetic time is generally attributed to the noncoincidence of the Earth's rotational axis and geomagnetic dipole axis and their seasonal angular variation with the ecliptic plane.