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- W1748791780 abstract "This paper (the second of a series) presents the results of statistical investigation of relationship between the interplanetary electric field EKL and the Polar Cap (PC) index in case of magnetic substorms (1998–2001), which have been analyzed in Troshichev et al. (J. Geophys. Res. Space Physics, 119, 2014). The PC index is directly related to the EKL field variations on interval preceding the substorm sudden onset (SO): correlation R > 0.5 is typical of more than 90 % of isolated substorms, 80 % of expanded substorms, and 99 % of events with coordinated EKL and PC jumps. The low or negative correlation observing in ~10 % of examined substorms suggests that the solar wind flow measured by the Advanced Composition Explorer (ACE) spacecraft in the Lagrange point L1 did not encounter the magnetosphere in these cases. Examination of the delay times ΔT in the response of PC index to EKL variations provides the following results: (1) delay times do not depend on separate solar wind parameters, such as solar wind speed VX and interplanetary magnetic field (IMF) BZ component, contrary to general conviction, (2) the ΔT value is best controlled by the EKL field growth rate (dEKL/dt), (3) the lower ΔT limit (5–7 min is attained under conditions of the higher EKL growth rate, and (4) the PC index provides the possibility to verify the solar wind flow transportation time from ACE position (where the solar wind speed is estimated) to magnetosphere. These results, in combination with data testifying that the substorm onsets are related to the PC precursors, demonstrate that the PC index is an adequate ground-based indicator of the solar wind energy incoming into the magnetosphere." @default.
- W1748791780 created "2016-06-24" @default.
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- W1748791780 date "2015-10-21" @default.
- W1748791780 modified "2023-10-13" @default.
- W1748791780 title "PC index as a proxy of the solar wind energy that entered into the magnetosphere: 2. Relation to the interplanetary electric field E KL before substorm onset" @default.
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- W1748791780 doi "https://doi.org/10.1186/s40623-015-0338-4" @default.
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