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.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 376

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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