Solar Energetic Particle Trapping in the Magnetosphere: What Spectral Differences Tell Us About Mechanisms

Details Solar Energetic Particle Trapping in the Magnetosphere: What Spectral Differences Tell Us About Mechanisms Solar Energetic Particle Trapping in the Magnetosphere: What Spectral Differences Tell Us About Mechanisms

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b2009l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH31B-2009

Astronomy and Astrophysics

Astrophysics

[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7984] Space Weather / Space Radiation Environment

Scientific paper

Solar energetic particles (SEPs) are protons, electrons, and heavy ions emitted from the Sun with energies spanning tens of keV to GeV. These events are of extreme importance to all space-based systems be they scientific, commercial, or security based on possible service interruptions or premature system aging due to increased radiation exposure. Importantly, solar protons can become trapped in the inner magnetosphere increasing the exposure for systems in the region. Understanding the conditions under which solar protons become trapped and untrapped in the magnetosphere and how trapping depends on the energy distribution of the SEP are the main focuses of this work. Focusing on what spectral differences between high and low latitude measurements tell us about the trapping mechanisms through comparison to geomagnetic cutoff predicted differences. Using data from NOAA POES and GPS BDD2R/CXD energetic proton instruments we explore the dynamics and particle signatures hinting at the configuration of the magnetic field allowing the protons access to regions where they are normally excluded and any rapid changes causing the protons to become trapped.

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