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arXiv · 1111.6914

Recovery phase of magnetic storms induced by different interplanetary drivers

Yu. I. Yermolaev·I. G. Lodkina·N. S. Nikolaeva·M. Yu. Yermolaev
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Abstract

Statistical analysis of Dst behaviour during recovery phase of magnetic storms induced by different types of interplanetary drivers is made on the basis of OMNI data in period 1976-2000. We study storms induced by ICMEs (including magnetic clouds (MC) and Ejecta) and both types of compressed regions: corotating interaction regions (CIR) and Sheaths. The shortest, moderate and longest durations of recovery phase are observed in ICME-, CIR-, and Sheath-induced storms, respectively. Recovery phases of strong ($Dst_{min} < -100$ nT) magnetic storms are well approximated by hyperbolic functions $Dst(t)= a/(1+t/τ_h)$ with constant $τ_h$ times for all types of drivers while for moderate ($-100 < Dst_{min} < -50$ nT) storms $Dst$ profile can not be approximated by hyperbolic function with constant $τ_h$ because hyperbolic time $τ_h$ increases with increasing time of recovery phase. Relation between duration and value $Dst_{min}$ for storms induced by ICME and Sheath has 2 parts: $Dst_{min}$ and duration correlate at small durations while they anticorrelate at large durations.

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Yu. I. Yermolaev, I. G. Lodkina, N. S. Nikolaeva, M. Yu. Yermolaev. 2011-11-29. Recovery phase of magnetic storms induced by different interplanetary drivers. https://doi.org/10.1029/2012ja017716

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