Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33c..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33C-07
Physics
2114 Energetic Particles (7514), 2784 Solar Wind/Magnetosphere Interactions, 7514 Energetic Particles (2114), 7984 Space Radiation Environment
Scientific paper
The solar energetic particle (SEP) events of solar cycle 23 were the best observed in history, thanks to new instruments flown on spacecraft that included ACE, RHESSI, SAMPEX, SOHO, Ulysses, and Wind. For the first time it has been possible to measure the elemental, isotopic, and ionic charge state composition of essentially all of the elements from H up through the Fe group and the energy spectra of key species from solar wind energies to ~100 MeV/nucleon. These studies have provided new insights into the source of the particles that get accelerated in SEP events and raised new challenges for understanding the acceleration and transport processes that are at work. From a space weather point of view, solar cycle 23 was the most active of the space era, including four of the ten largest solar proton events in the last 50 years and the largest ground-level event since 1956. Many of these SEP events also resulted in major geomagnetic storms, allowing SEP access to low latitudes and providing numerous examples of transient radiation belts. This talk will review some of the highlights from SEP studies of solar cycle 23.
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