Thickness of Heliospheric Current and Plasma Sheets: Dependence on Distance

Details Thickness of Heliospheric Current and Plasma Sheets: Dependence on Distance Thickness of Heliospheric Current and Plasma Sheets: Dependence on Distance

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh41a..01z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH41A-01

Physics

2102 Corotating Streams, 2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma

Scientific paper

Heliospheric current sheets (HCS) are well defined structures that separate the interplanetary magnetic fields with inverse polarities. Surrounded by heliospheric plasma sheets (HPS), the current sheets stretch throughout the heliosphere. Interesting questions that still remain unanswered include how the thickness of these structures will change along the distance? And what determines the thickness of these structures? To answer these fundamental questions, we have carried out a study of the HCS and HPS using recent Ulysses data near 5 AU. When the results were compared with earlier studies at 1 AU using ISEE-3 data, they were surprising and unexplained. Although the plasma sheet grew thicker, the embedded current sheet grew thinner! Using data under the same (or very similar) circumstances, we have extended the analysis in two ways. First, the same current-plasma sheets studied at 5 AU have been identified at 1 AU using ACE data. Second, data obtained while Ulysses was en-route to Jupiter near 3 AU have been analyzed. This three-point investigation reveals the thickness variation along the distance and enables the examination of the controller of this variation.

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