Solar wind induced processes in the magnetotail

Details Solar wind induced processes in the magnetotail Solar wind induced processes in the magnetotail

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..119s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 1-2, p. 119-126.

Physics

1

Scientific paper

Solar wind/IMF parameters and their variations influence the state and dynamics of the magnetosphere in several different ways, and the plasma sheet plays its own active role to form the magnetotail's rssponse to external driving. This field is still quite conrtoversial; key unsolved issues are those which probably involve the nonsteady, nonequilibrium and nonlinear character of the system. This paper discusses an interesting development of concepts concerning (1) plasma sheet convection, (2) mechanisms which initiate the substorm onset, and (3) variability of tail dynamics. A remarkable example is a recognition of Bursty Bulk Flows as a basic way for the plasma sheet to sustain the convective transport of plasma, energy and magnetic flux via transient mesoscale dynamic structures. As concerns the substorm onset, the sharp change from the magnetic reconnection (NEL) model to processes in the dipolar-like near tail is now moving into a synthetic stage. Hear non-linear models of different coupled instabilities are actively explored to find a way to excite the tearing mode starting from a singular thin current sheet configuration which seems to form in the near tail prior to breakup. Variable responses to external drivers and the variability of substorms compel a recognition of the magnetotail as a very complicated nonlinear open system which includes a heirarchy of coupled process of different scales. A unique fleet of magnetospheric spacecraft, simultaneously probing different domains and supported by extensive ground observations, global imaging and solar wind monitoring, noe provides a real chance to understand the magnetotail as a global dynamic system.

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