Timing and localization of reconnection signatures - Is there a substorm model problem?

Details Timing and localization of reconnection signatures - Is there a substorm model problem? Timing and localization of reconnection signatures - Is there a substorm model problem?

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..41k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 6, pp. 41-1, CiteID 1308, DOI 10.1029/2002GL016369

Physics

6

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetotail Boundary Layers

Scientific paper

Observations place ionospheric substorm onset signatures on field lines that map to the near-Earth plasma sheet, and field-aligned currents (FACs) are observed before dipolarization, equatorward of open field lines. The near-Earth neutral line (NENL) model, however, appears to suggest perturbations to originate from the x-line on newly reconnected field lines, which map to much higher latitudes. Its order of dipolarization, FACs, and subsequent ionospheric signatures contradicts the observations. Using large-scale kinetic simulations, we demonstrate that these ``flaws'' of the NENL model are misconceptions and that the timing and location of signatures in the model are indeed consistent with observations. In a thinned current sheet, energetic ions are virtually unmagnetized, get further energized when passing through the neutral sheet, and travel earthward quickly and close to the neutral sheet, thus providing a pathway for early substorm signatures at relatively low latitudes.

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