A new technique for determining Substorm Onsets and Phases from Indices of the Electrojet ( SOPHIE )

  title={A new technique for determining Substorm Onsets and Phases from Indices of the Electrojet ( SOPHIE )},
  author={Colin Forsyth and I. Jonathan Rae and John C. Coxon and Mervyn P. Freeman and Caitriona M. Jackman and J. W. Gjerloev and Andrew N. Fazakerley},
We present a new quantitative technique that determines the times and durations of substorm expansion and recovery phases and possible growth phases based on percentiles of the rate of change of auroral electrojet indices. By being able to prescribe different percentile values, we can determine the onset and duration of substorm phases for smaller or larger variations of the auroral index or indeed any auroral zone ground-based magnetometer data. We apply this technique to the SuperMAG AL (SML… CONTINUE READING

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Publications referenced by this paper.
Showing 1-10 of 52 references

A statistical analysis of substorm associated tail activity, Adv

  • T. S. Hsu, R. L. McPherron
  • Space Res.,
  • 2012
Highly Influential
8 Excerpts

Substorm onset observations by IMAGE-FUV

  • H. U. Frey, S. B. Mende, V. Angelopoulos, E. F. Donovan
  • Substorms
  • 2007
Highly Influential
6 Excerpts

Observations of the phases of the substorm

  • I. O. Voronkov, E. F. Donovan, J. C. Samson
  • J. Geophys. Res.,
  • 2003
Highly Influential
4 Excerpts

Seasonal and solar cycle variations of the auroral electrojet indices

  • B. H. Ahn, H. W. Kroehl, Y. Kamide, E. A. Kihn
  • J. Atmos. Sol. Terr
  • 2000
Highly Influential
6 Excerpts

The development of the auroral substorm, Planet

  • S. I. 1301–1310. Akasofu
  • Space Sci.,
  • 1964
Highly Influential
4 Excerpts

Are steadymagnetospheric convection events prolonged substorms

  • S. E. Milan
  • J. Geophys. Res. Space Physics,
  • 2015
3 Excerpts

Solar cycle dependence of substorm occurrence and duration : Implications for onset

  • R. L. McPherron, T.-S. Hsu, V. Angelopoulos
  • J . Geophys . Res . Space Physics
  • 2015

Automated determination of auroral breakup during the substorm expansion phase using all - sky imager data

  • P. T. Newell, J. W. Gjerloev
  • J . Geophys . Res . Space Physics
  • 2014

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