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Rainer Schwenn Max-Planck-Institut für Aeronomie Katlenburg-Lindau

CME Mythology: Do Global CMEs or Sympathetic CMEs Exist?. International Solar Cycle Studies 2001 (ISCS), June 13-16, 2001 Longmont, Colorado. Rainer Schwenn Max-Planck-Institut für Aeronomie Katlenburg-Lindau. Halo CMEs: a new quality from SOHO.

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Rainer Schwenn Max-Planck-Institut für Aeronomie Katlenburg-Lindau

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  1. CME Mythology: Do Global CMEs or Sympathetic CMEs Exist? International Solar Cycle Studies 2001 (ISCS), June 13-16, 2001 Longmont, Colorado Rainer Schwenn Max-Planck-Institut für Aeronomie Katlenburg-Lindau

  2. Halo CMEs: a new quality from SOHO A classical “halo” CME, observed by LASCO-C2 on 4.11.1998 Towards or away from Earth? That knowledge would grant space weather predictions a new quality

  3. Front or backside: a new quality from SOHO A pressure wave (EIT Wave) in the solar atmosphere, pushed by a flare on 7.4.1997. A halo CME was launched towards Earth that caused a geomagnetic storm on 10.4.97.

  4. This CME began as a “global” CME, i.e. in two parts simultaneously on both limbs. Later, the envelope turned into a full halo. Note: the source “axis” was about parallel to the lobes’ axis

  5. Another apparent halo CME, also from two parts on opposite limbs This was the obvious source, on the front side. The bright flash occurred at 05:58 UT, and the axes were parallel. However…

  6. Morale: better look twice, in particular if you are about to create a myth… …close inspection of C2 images proves: the east limb event started more than one hour ahead of time! An independent backside source?

  7. The typical “global” CME? No: two lobes contained in one single halo CME, a “split halo”

  8. The same event: the source axis was perpendicular to the lobes’ axis!

  9. No “global “ event, just two lobes contained in a halo CME, a backside event by the way

  10. Another split halo CME, “butterfly type”

  11. In this “butterfly type” halo CME, the axis was about 450 off

  12. 2 lobes under a common halo envelope. The source was oriented almost parallel to the lobes’ axis.

  13. The source axis is perpendicular to the lobes’ axis

  14. One more example: a “butterfly-type” halo CME, on the backside

  15. A perfect halo, originating close to to disc center

  16. Close relatives of “global” CMEs: Cannibals! Gopalswamy, 2000 A halo CME, “cannibalizing” a limb CME

  17. Close relatives of “global” CMEs: Cannibals! Gopalswamy, 2000 A halo CME, “cannibalizing” a limb CME Note: the “light bulb” CME had occurred behind the limb

  18. Close relatives of “global” CMEs: Cannibals! Gopalswamy, 2000 2 succeeding halo CMEs, “cannibalizing” a limb CME

  19. Other suspects in context with global CMEs: magnetic chains Chertok, 1997 ff Suggestion: “…the chains are visible manifestations of separators or quasi-separatrix layers formed between different interacting large-scale magnetic flux systems in the evolving global magnetic solar atmosphere”

  20. Alternative explanation of “global” CMEs: new perspective on flux ropes Sketch showing the possible large-scale topology of a flux-rope magnetic cloud Bothmer and Schwenn, 1998

  21. Alternative explanation of “global” CMEs: new perspective on flux ropes Chen et al., 1993 ff Erupting flux rope with its legs connected to the sun

  22. Chen et al., 2000 This CME (on September 9th, 1997) was well observed by the Mark 3 and LASCO coronagraphs. It fits well to the erupting flux rope model

  23. Chen et al., 2000 This is what the flux rope model would predict how this CME should look like

  24. Different perspectives of flux rope CMEs 1. A typical flux rope CME seen from the side, I.e. above one limb

  25. 2. An extended flux rope CME seen from the front or back side. Note the 2D rope structure and the engulfing 3D halo CME structure. “Global” CMEs: a projection effect!

  26. “Global” CMEs: a projection effect!

  27. CME Mythology: Do Global CMEs or Sympathetic CMEs Exist? My answer is: No. They are probably just head-on (or head off…?) flux rope halo CMEs. Let’s see what they look like from different perspectives, i.e., STEREO and Solar Orbiter. STAY TUNED! Rainer Schwenn Max-Planck-Institut für Aeronomie Katlenburg-Lindau

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