WHI WG 4: Transients

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WHI WG 4 Transients Tracing CMEs from Sun to
Earth and Beyond Group coordinator David Webb

• Discussed March 25, April 26-29, April 9
  related events April 4-7
• - All have good STEREO, SOHO coverage
• Mar 25 Apr 26 CMEs both fast CMEs with shocks
  (Type IIs)
• arcades, dimmings EUV waves
• - several ongoing studies papers already
• Apr 9 event is slower CME, erupting prom.,
  current sheet evolution
• - also ongoing studies papers
• - 2 - 3 earlier EPs, CMEs in same region
• Produce a matrix of data and projects on events
• Identify source regions for all WHI CMEs
• - add, e.g., Carr. longitudes
• Context of erupting regions within global
  evolution

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WHI CMEs

• Thursday - Updates discussion on following
  items
• Deborah Haber using helioseismology to get
  flows as f(depth) in two areas of activity on CR
  2068 and 2069
• - Daily results in event areas
• - Possible vortex before Apr. 5-9 events
• - Flows before Apr. 26 disk event
• Toni Galvin new in-situ results for April 26-29
  CME Sun-STEREO-B connection event
• - Proton distributions SWEA electron pitch
  angle distri. some bidirectional
  streaming.
• - Need to disentangle CIR flows from ejecta
• Nat Gopalswamy April 26 event evidence of
  brief IP type II detected
• - Implies lowest starting freq. ever seen
  implications for medium through which shock
  propagates
• NOT discussed Look for shock/ejecta from Mar.
  25 CME at Ulysses?? Ulysses is NE of Sun and CME
  is off EL.

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STEREO-B PLASTIC Proton distribution Stack plots
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