Quasi-stagnant plasmoid in the middle tail - A new preexpansion phase phenomenon

Details Quasi-stagnant plasmoid in the middle tail - A new preexpansion phase phenomenon Quasi-stagnant plasmoid in the middle tail - A new preexpansion phase phenomenon

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4245n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4245-4255. DOE-sponsored research.

Physics

33

Geomagnetic Tail, Magnetic Field Reconnection, Magnetic Storms, Magnetospheric Instability, Space Plasmas, Electric Field Strength, Energetic Particles, International Sun Earth Explorer 3, Magnetic Field Configurations, Magnetohydrodynamic Flow, Stagnation Flow

Scientific paper

From the analysis of ISEE 3 data it is found that a plasmoid is sometimes formed in the middle tail outside the intervals of the substorm expansion phase. This plasmoid is produced by reconnection at the X-type neutral line, which is located earthward of the distant neutral line but beyond the substorm-associated near-tail neutral line, and it is almost stagnant in that the associated flow speed is less than 300 km/s. The blocking effect of the distant neutral line is the most probable reason for the slow movement. The quasi-stagnant plasmoid is observed at x = -60 to - 100 earth radii for a duration of a few tens of minutes, and in about one half of the cases it is followed by the fast tailward streaming. The onset of this streaming tends to coincide with the onset of the substorm expansion phase, and this probably occurs when the reconnection at the middle-tail neutral line comes close to processing the last closed field line. Intensification of the dawn-to-dusk electric field that causes the mantle plasma to reach the plasma sheet boundary closer to the earth is suggested as the reason for the formation of the middle-tail neutral line earthward of the distant neutral line. The effects on the energetic particle flux and relation to the near-tail reconnection are also discussed.

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