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Origins of Solar Minimum CMEs with ICMEs

This study investigates the sources and characteristics of solar minimum coronal mass ejections (CMEs) associated with interplanetary CMEs (ICMEs). It examines the initiation, propagation, and destination of CMEs, as well as provides an update on ICME events at ~1AU. The study identifies the sources of CMEs with ICMEs by analyzing low-corona activity and initiation sites. Forward modeling results of STEREO CMEs are also presented.

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Origins of Solar Minimum CMEs with ICMEs

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  1. Origins of Solar Minimum CMEs with ICMEs Yan Li 1 B. J. Lynch1, J. G. Luhmann1, A. Thernisien2, A. Vourlidas2, E. Kilpua3, L. Jian4 , A. B. Gavin5 Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA, 94720 Space Science Division, Naval Research Laboratory, Washington, DC 20375 Department of Physics, Theoretical Physics Division, University of Helsinki, Finland Institute of Geophysics & Planetary Physics, UC Los Angeles, Los Angeles, CA 90095 Space Science Center, University of New Hampshire, Durham, NH 03824

  2. ICME source CME HI Where did a CME arise? - source How did a CME arise? - initiation Where does a CME go? How does a CME go? - propagation

  3. An update of ICME events at ~1AU

  4. ICME (shock and ejecta) dates, times and duration2007

  5. ICME (shock and ejecta) dates, times and duration2008 January - June

  6. ICME (shock and ejecta) dates, times and duration2008 July - December

  7. ICME (shock and ejecta) dates, times and duration2009 January - July

  8. ICME (shock and ejecta) dates, times and duration2009 August - October

  9. Identify the Sources of CMEs with ICMEs • Begin with ICMEs and identify the corresponding coronagraph CMEs. • Identify low-corona-activity / initiation-sites of this group of CMEs (a small fraction of CME population).

  10. CMEs with ICMEs in 2007

  11. CMEs with ICMEs in 2008

  12. CMEs with ICMEs in 2008

  13. CMEs with ICMEs in 2009

  14. CMEs with ICMEs (MCs) in 2009

  15. Forward Modeling Results of STEREO CMEs Thernisien et al. (2009) • 26 bright STEREO • CMEs (Nov07 to Aug08) • were fitted with • Forward Modeling; • Three CMEs • encountered STB; • One CME • encountered STA. 6 10 9 7

  16. Parameters in Forward modeling Thirnisien et al. (2006, 2009)

  17. FWM 3D Parameters forFour Source CMEs of ICMEs in 2008

  18. 2008-March-17 small magnetic region and double dimming CME FWM

  19. 2008-April-26 flare related CME FWM

  20. 2008-June-02 quiet Sun streamer blow-out CME - CME source location by FWM FWM MC axis

  21. 2008-Jul-07 CME with unclear source near a coronal hole boundary - CME source location by FWM

  22. Long term variation of Bz polarity within Magnetic Cloud MIN MIN MAX MAX MIN

  23. Summary • The small group of CMEs with ICMEs during STEREO time had variety of solar sources, including small magnetic regions, weak flares, small EUV dimmings and quiet Sun, and lack of large active regions and large flares. • Almost all of these CMEs are slow and so as to the resulted ICMEs. • We have worked on detailed case studies for a few cases (not shown today), and are carrying on these studies further by other case studies and statistical studies.

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