Observations of Energetic Particles Associated with Co-rotating Interaction Regions during Solar Cycles 23 and 24

Details Observations of Energetic Particles Associated with Co-rotating Interaction Regions during Solar Cycles 23 and 24 Observations of Energetic Particles Associated with Co-rotating Interaction Regions during Solar Cycles 23 and 24

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eguga..1215517d&link_type=abstract

EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p.15517

Computer Science

Scientific paper

Energetic particle events associated with corotating interaction regions (CIRs) have been observed near Earth orbit for decades and yet many observational features have never been satisfactorily explained. These include the characteristic lack of roll-over of the energy spectra below ~0.5 MeV/nucleon and the presence of strong particle flows transverse to the local magnetic field direction. In addition, more recently, STEREO and ACE have observed (1) the absence of energetic particles in association with some CIRs that have plasma characteristics (e.g., solar wind speed, compression in density and magnetic field etc) that are comparable to those that produced particle events at Earth, and (2) the arrival of CIR-associated ions by more than a day prior to that expected from simple corotation delays. In this paper, we highlight these puzzling observational results using energetic particle, magnetic field, and solar wind plasma measurements from ACE, Wind, and STEREO during the activity minima of solar cycles 23 and 24 and outline a specific set of challenges for existing theoretical models.

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