The Suprathermal Seed Population of Heavy Ions Accelerated at Interplanetary Shocks

Details The Suprathermal Seed Population of Heavy Ions Accelerated at Interplanetary Shocks The Suprathermal Seed Population of Heavy Ions Accelerated at Interplanetary Shocks

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh42b..01d&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH42B-01

Physics

7513 Coronal Mass Ejections, 2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks, 2162 Solar Cycle Variations (7536)

Scientific paper

Energetic ions accelerated at interplanetary shocks driven by fast coronal mass ejections (CMEs) have been presumed to originate from the ambient solar wind material. Recently, however, detailed composition measurements from NASA's Advanced Composition Explorer (ACE) have unexpectedly shown large enrichments of the rare isotope 3He over the solar wind value in a number interplanetary shock events. The acceleration of tracer ions like 3He in such events has provided clear evidence that the energetic particle population is not accelerated out of the thermal solar wind, but rather out of a suprathermal pool at energies above the bulk solar wind. Known sources of material for this complex and largely unexplored energy regime include the suprathermal tail of the solar wind, interstellar source and inner source pick-up ions, and remnant suprathermals from prior solar and/or interplanetary activity. Thus the suprathermal seed population has highly variable intensity levels and composition when compared with the bulk solar wind. We examine the temporal properties of this suprathermal source population as measured by the Ultra Low-Energy Isotope Spectrometer (ULEIS) and the SupraThermal through Energetic Particle (STEP) instrument on board ACE and Wind, respectively during solar cycle 22 and 23. We will discuss the experimental and theoretical efforts that are needed to fully understand the injection and acceleration of energetic particles at interplanetary shocks.

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