Evidence for the tailward retreat of a magnetic neutral line in the magnetotail during substorm recovery

Details Evidence for the tailward retreat of a magnetic neutral line in the magnetotail during substorm recovery Evidence for the tailward retreat of a magnetic neutral line in the magnetotail during substorm recovery

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..261f&link_type=abstract

Geophysical Research Letters, vol. 8, Mar. 1981, p. 261-264. Bundesministerium für Forschung und Technologie

Physics

94

Geomagnetic Tail, Lines Of Force, Magnetic Storms, Magnetohydrodynamic Flow, Space Plasmas, Boundary Layer Plasmas, Field Aligned Currents, Geomagnetism, Neutral Sheets, Plasma Layers, Proton Precipitation, Satellite Observation

Scientific paper

Plasma sheet observations made during a substorm recovery at 0400 to 0430 UT on March 1, 1978 with the ISEE satellites strongly suggest that the observed field-aligned flow of plasma in the earthward direction has mirrored in the vicinity of the earth and returned to the position of the satellites to produce the tailward flow seen at this time. The correlation between the estimated speeds of the earthward and tailward moving distribution indicates that the observed changes in velocity are spatial rather than temporal. It is concluded that the movement of the plasma sheet surface results from the propagation of an energetic particle source on to new magnetic field lines which progressively map deeper into the tail and also to higher polar latitudes at the earth. The movement of the source onto new magnetic field lines is clearly consistent with the tailward retreat of a magnetic neutral line in the plasma sheet during substorm recovery.

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