Counterstreaming electrons in magnetic clouds near 5 AU

Details Counterstreaming electrons in magnetic clouds near 5 AU Counterstreaming electrons in magnetic clouds near 5 AU

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10906110c&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A6, CiteID A06110

Astronomy and Astrophysics

Astrophysics

16

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields

Scientific paper

Suprathermal electron pitch angle spectrograms were searched for counterstreaming signatures in 31 magnetic clouds identified in Ulysses data when the spacecraft was located ~5 AU from the Sun. Under the assumption that counterstreaming indicates closed field lines, that is, field lines attached to the Sun at both ends, we find that the clouds range from 0 to 100% closed, with an average of 55% closed, and that the percentage of closed flux tends to increase with increasing cloud size. The results are similar to those found at 1 AU, implying that the rate at which a cloud opens, presumably by interchange reconnection back at the Sun, slows significantly as its leading edge moves further out into the heliosphere.

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