Other
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2285z&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Dec. 1990, p. 2285-2288.
Other
7
Diurnal Variations, Neptune (Planet), Planetary Magnetospheres, Planetary Mantles, Space Plasmas, Magnetic Field Configurations, Magnetosheath, Planetary Magnetotails, Planetary Structure
Scientific paper
Voyager's post-encounter trajectory at Neptune allows the directions of the magnetic field in the magnetosheath produced by the draping of the typical interplanetary field and by alignment with the magnetotail to be distinguished. Changes of the field from the draped to the magnetotail-aligned direction accompanied by decreases of plasma velocity, density, and temperature, observed at intervals of approximately a Neptunian day, are consistent with the assumption that Voyager repeatedly encountered a plasma mantle region extending well in the magnetosheath and modulated by the rotation of the planet's magnetic dipole. Other interpretations are either implausible or inconsistent with the observations. Previously reported periodic velocity decreases in the magnetosheath of Uranus can be interpreted in the same way. Extended plasma mantles may thus be a general property of planetary magnetospheres interacting with the magnetized solar wind. Analogous effects at earth cannot yet be observed because of lack of suitable spececraft missions, but their existence is suggested by theoretical arguments.
Lepping Ronald P.
Ness Norman F.
Siscoe George L.
Vasyliūnas Vytenis M.
Zhang Ming
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