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Dynamics of Large-Scale Solar-Wind Streams Obtained by the Double Superposed Epoch Analysis: 2. Comparisons of CIRs vs. Sheaths and MCs vs. Ejecta

Abstract

This work is a continuation of our previous article (Yermolaev et al. in J. Geophys. Res. 120, 7094, 2015), which describes the average temporal profiles of interplanetary plasma and field parameters in large-scale solar-wind (SW) streams: corotating interaction regions (CIRs), interplanetary coronal mass ejections (ICMEs including both magnetic clouds (MCs) and ejecta), and sheaths as well as interplanetary shocks (ISs). As in the previous article, we use the data of the OMNI database, our catalog of large-scale solar-wind phenomena during 1976 – 2000 (Yermolaev et al. in Cosmic Res., 47, 2, 81, 2009) and the method of double superposed epoch analysis (Yermolaev et al. in Ann. Geophys., 28, 2177, 2010a). We rescale the duration of all types of structures in such a way that the beginnings and endings for all of them coincide. We present new detailed results comparing pair phenomena: 1) both types of compression regions (i.e. CIRs vs. sheaths) and 2) both types of ICMEs (MCs vs. ejecta). The obtained data allow us to suggest that the formation of the two types of compression regions responds to the same physical mechanism, regardless of the type of piston (high-speed stream (HSS) or ICME); the differences are connected to the geometry (i.e. the angle between the speed gradient in front of the piston and the satellite trajectory) and the jumps in speed at the edges of the compression regions. In our opinion, one of the possible reasons behind the observed differences in the parameters in MCs and ejecta is that when ejecta are observed, the satellite passes farther from the nose of the area of ICME than when MCs are observed.

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Acknowledgements

We thank the OMNI database team for the opportunity to use data obtained from GSFC/SPDF OMNIWeb ( http://omniweb.gsfc.nasa.gov ). YY is grateful to the SCOSTEP ”Variability of the Sun and Its Terrestrial Impact” (VarSITI) program for support of his participation in the workshop “International Study of Earth-Affecting Solar Transients (ISEST)/MiniMax” in Mexico City, Mexico, 26 – 30 October 2015. This work was supported by the Russian Science Foundation, project 16-12-10062.

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Correspondence to Y. I. Yermolaev.

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N.S. Nikolaeva is deceased.

Earth-affecting Solar Transients

Guest Editors: Jie Zhang, Xochitl Blanco-Cano, Nariaki Nitta, and Nandita Srivastava

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Yermolaev, Y.I., Lodkina, I.G., Nikolaeva, N.S. et al. Dynamics of Large-Scale Solar-Wind Streams Obtained by the Double Superposed Epoch Analysis: 2. Comparisons of CIRs vs. Sheaths and MCs vs. Ejecta. Sol Phys 292, 193 (2017). https://doi.org/10.1007/s11207-017-1205-1

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Keywords

  • Magnetic cloud
  • Ejecta
  • Sheath
  • CIR