July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

An Investigation of the Causes of Solar-Cycle Variations in SEP Fluences and Composition

Aug 1, 2015, 6:00 PM
World Forum Theater (World Forum)

World Forum Theater

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
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Richard Mewaldt (Caltech)


Measurements with ACE, STEREO, and GOES show that the number of large solar energetic particle (SEP) events in solar cycle 24 is reduced by a factor of ~2 compared to this point of cycle 23, while the fluences of >10 MeV/nuc ions from H to Fe are reduced by factors ranging from ~4 to ~10. We investigate the origin of these cycle-to-cycle differences by evaluating possible factors that include: 1) the properties of the associated CMEs; 2) seed particle densities; 3) the interplanetary magnetic field strength; 4) interplanetary turbulence levels; 5) the relative contribution of particles in the energetic storm particle (ESP) portion of the SEP events. These properties will be evaluated in the context of existing SEP acceleration models.
Registration number following "ICRC2015-I/" 376
Collaboration -- not specified --

Primary author


Angelos Vourlidas (JHU/APL) Armstrong Tom (Fundamental Technologies, Inc) Charles Smith (University of New Hampshire) Christina Cohen (Caltech) Gang Li (University of Alabama/Huntsville) Glenn Mason (JHU/APL) Haggerty Dennis (JHU/APL) Tycho von Rosenvinge (NASA/Goddard Space Flight Center)

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