A possible case of radially antisunward propagating substorm onset in the near-earth magnetotail

Details A possible case of radially antisunward propagating substorm onset in the near-earth magnetotail A possible case of radially antisunward propagating substorm onset in the near-earth magnetotail

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..771l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, June 1990, p. 771-784.

Computer Science

9

Geomagnetic Tail, Magnetic Field Configurations, Magnetic Storms, Ampte (Satellites), Current Sheets, Satellite Observation

Scientific paper

It is generally thought that the local effects associated with substorm onset in the near-earth magnetotail (R less than about 10 earth radii) have a component of propagation which is radially earthward. This study presents a case during which it is possible that the local effects of substorm onset propagated radially antisunward, examining energetic-ion and magnetic-field data from AMPTE/CCE and energetic-particle data from the GEO satellite 1982-019 during a period of weak substorm activity on June 11, 1985. Although the effects of this event on the ground were very weak, the substorm had a dramatic effect on at least one portion of the near-earth magnetotail. During the period the spacecraft were in an unusually close radial alignment. The data show that phenomena associated with the local effects of substorm onset began at or near GEO before they were observed at CCE. This event is best explained by a near-earth disruption of the cross-tail current sheet and the consequent formation of a substorm current wedge, with a component of expansion antisunward down the tail.

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