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Solar Physics

, Volume 284, Issue 1, pp 17–46 | Cite as

The Solar Connection of Enhanced Heavy Ion Charge States in the Interplanetary Medium: Implications for the Flux-Rope Structure of CMEs

  • N. GopalswamyEmail author
  • P. Mäkelä
  • S. Akiyama
  • H. Xie
  • S. Yashiro
  • A. A. Reinard
Flux-Rope Structure of Coronal Mass Ejections

Abstract

We investigated a set of 54 interplanetary coronal mass ejection (ICME) events whose solar sources are very close to the disk center (within ± 15 from the central meridian). The ICMEs consisted of 23 magnetic-cloud (MC) events and 31 non-MC events. Our analyses suggest that the MC and non-MC ICMEs have more or less the same eruption characteristics at the Sun in terms of soft X-ray flares and CMEs. Both types have significant enhancements in ion charge states, although the non-MC structures have slightly lower levels of enhancement. The overall duration of charge-state enhancement is also considerably smaller than that in MCs as derived from solar wind plasma and magnetic signatures. We find very good correlation between the Fe and O charge-state measurements and the flare properties such as soft X-ray flare intensity and flare temperature for both MCs and non-MCs. These observations suggest that both MC and non-MC ICMEs are likely to have a flux-rope structure and the unfavorable observational geometry may be responsible for the appearance of non-MC structures at 1 AU. We do not find any evidence for an active region expansion resulting in ICMEs lacking a flux-rope structure because the mechanism of producing high charge states and the flux-rope structure at the Sun is the same for MC and non-MC events.

Keywords

Coronal mass ejections Flares Flux rope Magnetic cloud, charge state 

Notes

Acknowledgements

We thank the ACE, Wind, and SOHO teams for providing the data on line. SOHO is a project of international collaboration between ESA and NASA.

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Copyright information

© Springer Science+Business Media (outside the USA) 2013

Authors and Affiliations

  • N. Gopalswamy
    • 1
    Email author
  • P. Mäkelä
    • 2
  • S. Akiyama
    • 2
  • H. Xie
    • 2
  • S. Yashiro
    • 2
  • A. A. Reinard
    • 3
  1. 1.NASA Goddard Space Flight CenterGreenbeltUSA
  2. 2.The Catholic University of AmericaWashingtonUSA
  3. 3.NOAA Space Weather Prediction CenterBoulderUSA

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