Evidence of periodic (2-3 hour) near-tail magnetic reconnection and plasmoid formation: Geotail observations

Details Evidence of periodic (2-3 hour) near-tail magnetic reconnection and plasmoid formation: Geotail observations Evidence of periodic (2-3 hour) near-tail magnetic reconnection and plasmoid formation: Geotail observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..42h&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 42-1, CiteID 2189, DOI 10.1029/2002GL016162

Physics

8

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

During magnetospheric substorms, magnetic reconnection occurs in the near tail and causes the formation of plasmoids. In this paper, we present Geotail observations of periodic magnetic reconnection and plasmoids in the near tail. On April 17-18, 2002, Geotail was located in the northern lobe and detected ten cycles of magnetic field compressions within 24 hours, and southward turnings of the magnetic field Bz component or formations of plasmoids were clearly identified in the first seven cycles. The average period of the plasmoids was ~2.5 hours. A solar wind pressure impulse appeared to trigger the first magnetic compression (or plasmoid). Plasmoids continued to occur for many cycles after the solar wind pressure and interplanetary magnetic field had become stable. The observations suggest that substorms can be periodic and that the periodic substorms can occur without requirement of continuous external triggering.

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