Modulation of Anomalous Cosmic Rays in the Outer Heliosphere

Details Modulation of Anomalous Cosmic Rays in the Outer Heliosphere Modulation of Anomalous Cosmic Rays in the Outer Heliosphere

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52b..11s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH52B-11

Physics

7514 Energetic Particles (2114), 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields

Scientific paper

Changes in the modulation of anomalous cosmic rays (ACRs) occur as the interplanetary conditions change over the region between the observation and the termination shock where the ACRs are accelerated. As the two Voyager spacecraft approach the termination shock, there is the opportunity to localize and identify the factors leading to the onset and recovery of solar modulation of ACRs in the outer heliosphere. At 78 AU, the onset of modulation of anomalous cosmic rays occurred rather abruptly in mid-2000. At the lowest rigidities, ACR modulation continued to increase through the end of 2001, even when there was no merged interaction region between Voyager and the termination shock. These observations suggest that changes in the tilt and topology of the current sheet may contribute to the modulation of ACRs.

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