Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315110f&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 15, CiteID L15110
Physics
24
Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Energetic Particles (7514), Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Cycle Variations (7536)
Scientific paper
We investigate the effects of a large-scale interplanetary disturbance, such as a merged interaction region (MIR), on the properties of the heliospheric termination shock and particle population accelerated at the shock. The interaction process between transient structures and the shock is reflected in energetic particle spectra through variability in shock location, its compression ratio, and particle mean free paths that control their acceleration rate. It is shown that particle distributions observed at a specific moment of time exhibit features, such as spectral breaks, from earlier acceleration stages with lowest energy particles produced most recently and the more energetic anomalous cosmic rays (ACRs) accelerated at earlier times. We also show that a MIR collision can produce an extended period of anomalously low radial velocity in the heliosheath if density and velocity variations are correlated within a MIR and a following rarefaction.
Florinski Vladimir
Zank Gary P.
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