Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1485r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1485-1488.
Physics
16
Interplanetary Magnetic Fields, Magnetic Flux, Magnetopause, Planetary Magnetospheres, Uranus Atmosphere, Magnetic Field Reconnection, Magnetohydrodynamic Waves, Space Plasmas, Voyager 2 Spacecraft
Scientific paper
Magnetic field measurements by Voyager 2 reveal differences between the Uranian magnetopause and the typical terrestrial magnetopause. In particular there are pulsations in the magnetic field at Uranus which may represent partial crossings of the magnetopause, the entry into magnetic flux ropes or the passage through mirror mode waves. Examination of terrestrial data, especially those obtained under conditions of very high plasma beta, suggests that the last possibility is the more likely. The magnetopause crossing itself is also different than those typically observed at 1 AU. It contains a magnetic field rotation of over 270 deg. While this is rare at 1 AU, an example has been found at earth where the field rotation is also greater than 270 deg. In some aspects these crossings resemble slow shocks. This also occurred at a time of high plasma beta. Thus it is concluded that plasma beta is very important in determining the structure of the magnetopause.
Lepping Ronald P.
Russell Christopher T.
Song Paul
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