Low-Energy Ions at Voyagers 1 and 2 during the Current Solar Maximum

Details Low-Energy Ions at Voyagers 1 and 2 during the Current Solar Maximum Low-Energy Ions at Voyagers 1 and 2 during the Current Solar Maximum

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh51a..03d&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH51A-03

Physics

7807 Charged Particle Motion And Acceleration, 2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2139 Interplanetary Shocks

Scientific paper

We focus on observations at Voyagers 1 and 2, in the outer heliosphere, of ions with energies in the range 30 keV to 30 MeV. The period of interest is from 1998 to spring 2002, corresponding to the period of maximum solar activity of solar cycle 23. During this period Voyager 1 moved in helioradius from 69 to 85 AU, remaining at 34N deg. heliographic latitude, while Voyager 2 moved in helioradius from 54 to 67 AU, and in heliographic latitude from 18S to 24S deg. We use data from the LECP instruments on the Voyagers. We also compare these data with those from the spacecraft/instrument combinations IMP8/CPME, ACE/EPAM and Ulysses/HISCALE, all situated in the inner heliosphere, to assess the evolution of solar energetic particle intensities and large-scale solar wind disturbances as they propagate from the inner to the outer heliosphere. Variations in low-energy ion intensities at the Voyagers have been particularly large since early 2001. These variations are in response mainly to intense solar disturbances during July 2000 (e.g., the ``Bastille Day" activity) and during March-April 2001. Coalescence of multiple solar wind disturbances from this latter period is the likely driver of a shock that passed Voyager 2 in mid-October 2002, and produced the largest intensity increases observed in the 30-4000 keV ion channels in over four years. In contrast, during 1998 to early 2002, the low-energy ion intensities at Voyager 1 have not displayed clear signatures of local shock acceleration. We will discuss these results and provide updates on whether either Voyager has yet observed evidence, in the outer heliosphere, of enhanced solar activity that occurred during the latter half of 2001.

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