Temporal Field Variations

doi:10.1017/9781108290135.014

13 - Temporal Field Variations

from Part III - Spatial and Temporal Variations of the Geomagnetic Field

Published online by Cambridge University Press: 25 October 2019

Edited by

Andrew Yau and

Mioara Mandea: Affiliation:
Centre National d'études Spatiales, France
Monika Korte: Affiliation:
GeoforschungsZentrum, Helmholtz-Zentrum, Potsdam
Andrew Yau: Affiliation:
University of Calgary
Eduard Petrovsky: Affiliation:
Academy of Sciences of the Czech Republic, Prague

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Summary

The geomagnetic field supports a wide range of magnitudes, spatial scales and temporal variations. Outlined here are particular recent advances in temporal variability, stretching from geomagnetic field polarity reversals over millions of years, through secular field variations and ultra-low frequency (ULF) waves (1mHz – 5Hz), to very low frequency(VLF) emissions with frequencies in the kHz range. Long-term variations are discussed with respect to paleomagnetic, geological and archaeological records. Both external and internal fields contribute to temporal variations on decadal to daily time scales. More rapid oscillations at ULF wave frequencies associated with Sun-Earth connection contribute to weather in space. These involve the magnetosphere, ionosphere and atmosphere system, and may affect charged/neutral particle populations. Waves are generated external and internal to the magnetosphere and through integration of global magneto-hydrodynamic or local magneto-ionic modelling with satellite and ground observations, progress has been made in understanding the dynamics of waves and energy transfer within the coupled system. Equally important to space weather is the understanding of ULF and VLF waves on energetic charged particles in the Van Allen radiation belts during geomagnetic storms.

Keywords

Reversals geomagnetic spectrum internal/external fields ULF waves generation mechanisms mode coupling wave-particle interaction diffusion energetic particles diagnostics ground observations satellite observations future research

Type: Chapter
Information: Geomagnetism, Aeronomy and Space Weather
A Journey from the Earth's Core to the Sun
, pp. 181 - 206

DOI: https://doi.org/10.1017/9781108290135.014 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2019

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13 - Temporal Field Variations

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