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Description of the objective:

  • Measure the helicity of ICMEs leaving the Sun and link them directly to changes in the solar field thereby quantifying the effect of ICMEs on the solar cycle (Owens et al., 2007). 
  • Study the evolution of ICMEs in the inner heliosphere to determine the effects of local dynamics in changing their characteristics and apparent helicity, relating them directly to observed solar events (Zurbuchen and Richardson, 2006).




      • Target: CME source region (if identified), Prominence, Active Regions.
      • Observing mode: CME Watch (with possibility to measure Doppler velocities).
      • Slit size: 4” 
      • Exposure time/cadence and number of X positions: 30 s, X=224.
      • Field of View: 15’×11’ 
      • Number of repetitions of the study: Depending on the target (possibly 3 per target).
      • Observation time per day: 5.6 hours for 3 repetitions (1.9 hours per study).
      • Key SPICE lines to be included:  C III 977 Å, O VI 1032 Å, O VI 1037 Å, Ne VIII 770 Å, Mg IX 706 Å, Fe X 1028 Å - 15 lines (5 profiles+10 intensities).
      • Observing window preference: Multiple orbits.
      • Other instruments: EUI, PHI, all IS.
      • Comments:  The choice of lines, and also the number of intensities and profiles, is flexible, although the sum of the intensities and profiles is constrained to a maximum (e.g 15 for composition mapping). While varying the number of intensities and profiles, within the maximum, has no effect on the duration of the study, it will have an effect on the telemetry.