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

A 360° Survey of Solar Energetic Particle Events

Jul 30, 2015, 3:30 PM
Theater Foyer (World Forum)

Theater Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 21
Poster contribution SH-EX Poster 1 SH


Richard Mewaldt (Caltech)


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

Primary author


Christina Cohen (Caltech) Mason Glenn (JHU/APL) Richard Leske (California Institute of Technology) Tycho von Rosenvinge (NASA/Goddard Space Flight Center)

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