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| Titel |
Mirror mode structures and ELF plasma waves in the Giacobini-Zinner magnetosheath |
| VerfasserIn |
B. T. Tsurutani, G. S. Lakhina, E. J. Smith, B. Buti, S. L. Moses, F. V. Coroniti, A. L. Brinca, J. A. Slavin, R. D. Zwickl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 6, no. 3/4 ; Nr. 6, no. 3/4, S.229-234 |
| Datensatznummer |
250003228
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| Publikation (Nr.) |
 copernicus.org/npg-6-229-1999.pdf |
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| Zusammenfassung |
| We show evidence for mirror
mode structures at comet Giacobini-Zinner. These are plasma structures with
alternating high ß and low ß regions driven unstable when ß<perp>
/ß<parallel> > 1+ 1/<perp>. These structures are detected in a region
just adjacent to the magnetic tail and have scale sizes of ≈ 12 H2O group ion
cyclotron radii. Calculations are presented to show that mirror mode instability
can occur due to the perpendicular pressure associated with H2O+
cometary pickup ions in the region of mirror mode observation. Adjacent regions
(in the magnetic tail and further in the sheath) are found to be stable to the
mirror mode. Plasma waves are detected in relation with the mirror mode
structures. Low frequency 56 to 100 Hz waves are present in the high beta
portions, and high frequency, 311 Hz to 10 kHz, waves are present in low beta
regions. These may be electromagnetic lion roar waves and electrostatic
festoon-shaped waves, respectively, in analogy to plasma waves detected in the
Earth's magnetosheath. |
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