Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1417j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1417
Other
2728 Magnetosheath, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 6220 Jupiter
Scientific paper
Mirror modes waves are commonly observed in planetary magnetosheaths, cometary sheaths, and other plasmas with anisotropic temperature distributions. In the Jovian magnetosheath, various structural forms of mirror modes are observed in the magnetic field data. Quasi-periodic structures are the most commonly observed form throughout the magnetosheath, but there are also "peaks" and "dips". Peaks occur when the field strength abruptly and intermittently rises from a low background level. Dips are identified as brief, intermittent drops in the field from a relatively high background level. We describe the distribution of various mirror structure forms observed by the six spacecraft that have traversed the Jovian magnetosheath (Pioneer 10 & 11, Voyager 1 & 2, Ulysses, and Galileo). We have found that peaks are the least commonly observed mirror mode form. They are found in relatively high beta plasmas (>4), near local noon, where plasma has been in the magnetosheath for several (>5) hours. Dips are found on the flanks and near the magnetopause where plasma beta is relatively low (<2). We then present a model for the evolution of the observed mirror structural forms. In addition, cases where each of the various structural forms have been reported in studies of the terrestrial magnetosheath are examined. We report on the consistency of the terrestrial observations with our model expectations.
Galland Kivelson Margaret
Joy Steven P.
Khurana Krishan K.
Paterson William R.
Russell Christopher T.
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