Speaker
Richard Mewaldt
(Caltech)
Description
During solar cycle 23 it has been possible to routinely measure Solar Energetic Particle (SEP) Events over ~360 deg. in longitude with the combination of STEREO and near-Earth assets like ACE, SOHO, and GOES. It is found that SEPs are distributed more broadly in longitude than was appreciated based on single-point measurements. We report on a survey of large SEP events from 3 points of view as the STEREO spacecraft circle the Sun at ~22.5° per year. During 2010 through September, 2014 (when data from all three locations are available) there were 34 events at Earth that met the NOAA criterion of 10 protons/cm2sr-s (10 PFU) with energies >10 MeV. Taking into account the STEREO data through September 2015, there were 76 events that reached 10 PFU at at least one spacecraft, including 27 events that reached this criterion at 2 or 3 spacecraft. We compare the fluences and examples of the energy spectra at the three separated spacecraft. We also compare the distribution of peak proton intensities with those of previous solar cycles.
| Registration number following "ICRC2015-I/" | 0376 |
|---|
Author
Richard Mewaldt
(Caltech)
Co-authors
Christina Cohen
(Caltech)
Mason Glenn
(JHU/APL)
Richard Leske
(California Institute of Technology)
Tycho von Rosenvinge
(NASA/Goddard Space Flight Center)
