Anomalous Cosmic Rays at a Termination-Shock Crossing

Details Anomalous Cosmic Rays at a Termination-Shock Crossing Anomalous Cosmic Rays at a Termination-Shock Crossing

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3753j&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

5

Scientific paper

We consider the response of anomalous cosmic rays to transient radial incursions of the solar-wind termination shock. We find that the anomalouscosmic-ray spectrum and anisotropy has a temporal variation which depends on the time and spatial scale of the radial incursion, its speed, and the energeticparticle transport coefficients. For reasonable parameters, the energy spectrum of the very-low-energy particles shows the largest effect, and the spectrum of the higher-energy particles the least. For an observer enveloped by an inward incursion of finite lateral extent, we find, depending on the extent of the incursion, that the energy spectrum of high-energy particles, including the turnover caused by upstream modulation, can remain much the same as before. Simultaneously, however, the energy spectrum at the lowest energies is the characteristic downstream, post-sho ck spectrum with no turnover at low energies.

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