Speaker
Richard Mewaldt
(Caltech)
Description
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
Richard Mewaldt
(Caltech)
Co-authors
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)