Classification of the tailward drifting magnetic structures in the distant tail

Details Classification of the tailward drifting magnetic structures in the distant tail Classification of the tailward drifting magnetic structures in the distant tail

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2947n&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2947-2950

Physics

8

Crossed Fields, Geomagnetic Tail, Interplanetary Magnetic Fields, Magnetic Field Configurations, Neutral Sheets, Planetary Magnetic Fields, Plasma Drift, Plasma Oscillations, Space Plasmas, Bipolarity, Geophysical Satellites, Magnetic Field Reconnection, Magnetic Signatures, Magnetohydrodynamic Flow, Plasma Potentials, Satellite Observation, Wave Propagation

Scientific paper

The magnetic field observed at the neutral sheet crossings in the distant tail at absolute value of x = 200-210 R(sub e) can be classified into three types. At the sharp and isolated crossings (Type A), the B(sub z) component is positive on average and the tailward extension of the Low Latitude Boundary Layer (LLBL) seems to be the viable explanation, but the presence of large and Interplanetary Magnetic Field (IMF)-dependent B(sub y) component suggests that the field lines are not closed but are connected to IMF at both ends. When the neutral sheet crossings occur multiple times, Type B or C is observed. Type B is characterized by the bipolar magnetic signature and represents a plasmoid or flux rope. Type C is characterized by magnetic oscillations with typical time scales of a few tens of seconds. These oscillations may represent the magnetic loops or spirals produced by the tearing. In all cases, the direction of the drift motion derived from the electric and magnetic field data is directed predominantly tailward.

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