Equatorward moving auroral signatures of a flow burst observed prior to auroral onset

DOI Web Site Web Site 被引用文献8件
  • L. Kepko
    Space Science Center University of New Hampshire Durham New Hampshire USA
  • E. Spanswick
    Department of Physics and Astronomy University of Calgary Calgary, Alberta Canada
  • V. Angelopoulos
    Institute of Geophysics and Planetary Physics University of California Los Angeles California USA
  • E. Donovan
    Department of Physics and Astronomy University of Calgary Calgary, Alberta Canada
  • J. McFadden
    Space Sciences Laboratory University of California at Berkeley California USA
  • K.‐H. Glassmeier
    Institute of Geophysics and Extraterrestrial Physics Technical University of Braunschweig Braunschweig Germany
  • J. Raeder
    Space Science Center University of New Hampshire Durham New Hampshire USA
  • H. J. Singer
    Space Weather Prediction Center NOAA Boulder Colorado USA

書誌事項

公開日
2009-12
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009gl041476
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We present observations of a substorm that occurred on February 25, 2008. Auroral onset was observed with a multi‐spectral (<jats:italic>λ</jats:italic> = 427.8, 557.7 and 630.0 nm) and white light all sky imager at Gillam, Canada. An equatorward moving diffuse auroral patch was observed in the <jats:italic>λ</jats:italic> = 630.0 nm images at least six minutes prior to auroral onset. This form emerged from the background noise poleward of the eventual onset arc and intensified as it moved equatorward. Auroral expansion onset occurred when this form reached the onset arc location. Flows were detected by THEMIS probes P3 (TH‐D) and P4 (TH‐E) near <jats:italic>X</jats:italic> ∼ −11 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub> nearly 90 seconds prior to auroral expansion. A small discrete arc was observed in the <jats:italic>λ</jats:italic> = 557.7 nm images at the westward and equatorward edge of the diffuse 630.0 nm patch nearly 2 minutes prior to expansion onset, suggesting a field‐aligned current of a substorm current wedge geometry. We conclude that the equatorward moving <jats:italic>λ</jats:italic> = 630.0 nm diffuse auroral patch was generated by processes associated with an earthward moving flow burst that formed prior to auroral substorm onset.</jats:p>

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