Hyperbolic decay of the Dst Index during the recovery phase of intense geomagnetic storms

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  • J. Aguado
    Departamento de Física Universidad de Alcalá Alcalá de Henares Spain
  • C. Cid
    Departamento de Física Universidad de Alcalá Alcalá de Henares Spain
  • E. Saiz
    Departamento de Física Universidad de Alcalá Alcalá de Henares Spain
  • Y. Cerrato
    Departamento de Física Universidad de Alcalá Alcalá de Henares Spain

書誌事項

公開日
2010-07
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009ja014658
公開者
American Geophysical Union (AGU)

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説明

<jats:p>What one commonly considers for reproducing the recovery phase of magnetosphere, as seen by the Dst index, is exponential function. However, the magnetosphere recovers faster in the first hours than in the late recovery phase. The early steepness followed by the late smoothness in the magnetospheric response is a feature that leads to the proposal of a hyperbolic decay function to reproduce the recovery phase instead of the exponential function. A superposed epoch analysis of recovery phases of intense storms from 1963 to 2003 was performed, categorizing the storms by their intensity into five subsets. The hyperbolic decay function reproduces experimental data better than what the exponential function does for any subset of storms, which indicates a nonlinear coupling between <jats:italic>d</jats:italic>Dst<jats:italic>/dt</jats:italic> and Dst. Moreover, this kind of mathematical function, where the degree of reduction of the Dst index depends on time, allows for explaining different lifetimes of the physical mechanisms involved in the recovery phase and provides new insights for the modeling of the Dst index.</jats:p>

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