National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Investigation of solar energetic particle event properties

ROSES ID: NNH10ZDA001N      Selection Year: 2011      

Program Element: Focused Science Topic

Principal Investigator: Tycho Tor von Rosenvinge

Project Member(s):
Richardson, Ian G Co-I NASA Goddard Space Flight Center
Cane, Hilary V. Collaborator NASA/GSFC


This investigation will focus on solar energetic particle (SEP) events that include protons with energies above 25 MeV, and the related solar phenomena. Around a thousand such events since 1967 have been studied and will form the basis of this investigation. Data from the HET instruments on STEREO A and B and SIS on ACE will be used to investigate future cycle 24 events at multiple spacecraft. We will also consider multi-point observations made in cycle 21 by the Helios 1 and 2 spacecraft at 0.3- 1 AU and by near-Earth spacecraft. Among the proposed topics are: the longitudinal variation of SEP events based on the location and properties of the related solar events, coronal mass ejections and interplanetary shocks; the effects of interplanetary structure, including interplanetary coronal mass ejections, on particle propagation in the inner heliosphere; and the possible role of preceding CMEs and seed populations in determining the intensity of SEP events. A foundation of the work will be our previous studies that have already addressed some of the topics of interest to the Focus Team.


Performance YearReferenceInvestigation TypeActions
1Cohen, C. M. S.; Mason, G. M.; Wiedenbeck, M. E.; Haggerty, ...
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