Geotail observations of the average location of the near-Earth neutral line and its dependence on solar activity

Details Geotail observations of the average location of the near-Earth neutral line and its dependence on solar activity Geotail observations of the average location of the near-Earth neutral line and its dependence on solar activity

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm52a..04i&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM52A-04

Physics

[2744] Magnetospheric Physics / Magnetotail

Scientific paper

Direct observations of the near-Earth neutral line in the magnetotail are extremely rare due to sparse spatial and temporal spacecraft coverage. While such observations may elude us, the approximate location of the neutral line can be inferred from spacecraft observations of flux ropes and Travelling Compression Regions (TCRs). The direction of motion of these structures is dependent upon which side of the dominant x-line they were formed, and by examining many observations over a sufficiently long time period the reconnection site's average location can be determined. In this study we use Geotail data to infer the average x-line location during one year at solar maximum and another at solar minimum, and thereby determine the impact of solar activity on the location of reconnection in the magnetotail. We will present our methodology for selecting and interpreting the flux ropes and TCRs, our analysis of the x-line location at the two extremes of the solar cycle, and our conclusions regarding the consequences of solar activity on the magnetotail dynamics.

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