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 -- |
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)
