ISEE 3 observations during the CDAW 8 intervals - Case studies of the distant geomagnetic tail covering a wide range of geomagnetic activity

Details ISEE 3 observations during the CDAW 8 intervals - Case studies of the distant geomagnetic tail covering a wide range of geomagnetic activity ISEE 3 observations during the CDAW 8 intervals - Case studies of the distant geomagnetic tail covering a wide range of geomagnetic activity

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415189r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15189-15220. Research sponsored by DOE.

Physics

44

Geomagnetic Tail, Geomagnetism, Magnetic Disturbances, Magnetic Field Reconnection, Magnetic Measurement, Plasma Dynamics, Diurnal Variations, International Sun Earth Explorers, Kelvin-Helmholtz Instability, Magnetic Field Configurations

Scientific paper

Observations made by the ISEE 3 spacecraft in the distant geomagnetic tail during the eight CDAW 8 intervals are discussed, along with their relation to concurrent geomagnetic activity. This extensive multiinstrument case study of distant tail data covers a wide range of geomagnetic conditions from extended intervals of magnetic quiet with isolated substorms to prolonged periods of intense disturbance. Plasmoids are observed in the distant tail following disturbance enhancements, the time of their appearance being generally consistent with disconnection from the near-earth region at the time of the enhancement. Their structure is entirely consistent with the neutral line model. However, not all enhancements in geomagnetic activity result in the observation of plasmoids. In particular, the CDAW 8 data suggest that, during extended intervals of strong activity, a continuous neutral line may reside in the near-earth tail and some disturbance enhancements may then relate to an increase in the reconnection rate at a preexisting neutral line, rather than to new neutral line and plasmoid formation.

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