Global simulation of magnetosonic wave instability in the storm time magnetosphere

DOI Web Site Web Site 被引用文献5件
  • Lunjin Chen
    Department of Atmospheric Sciences University of California Los Angeles California USA
  • Richard M. Thorne
    Department of Atmospheric Sciences University of California Los Angeles California USA
  • Vania K. Jordanova
    Los Alamos National Laboratory Los Alamos New Mexico USA
  • Richard B. Horne
    British Antarctic Survey Natural Environment Research Council Cambridge UK

書誌事項

公開日
2010-11
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2010ja015707
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Coupling between the Rice Convection Model and Ring Current–Atmospheric Interactions Model codes is used to simulate the dynamical evolution of ring current ion phase space density and the thermal electron density distribution for the 22 April 2001 storm. The simulation demonstrates that proton ring distributions (<jats:italic>df</jats:italic><jats:sub>⊥</jats:sub>/<jats:italic>dv</jats:italic><jats:sub>⊥</jats:sub> > 0) develop over a broad spatial region during the storm main phase, leading to the instability of equatorial magnetosonic waves. Calculations of the convective growth rate of magnetosonic waves for multiples of the proton gyrofrequency from 2 to 42 are performed globally. We find that the ratio between the perpendicular ring velocity and the equatorial Alfven speed determines the frequency range of unstable magnetosonic waves. Low harmonic waves (<jats:italic>ω</jats:italic> < 10 <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgra20776-math-0001.gif" xlink:title="image"/> tend to be excited in the high‐density nightside plasmasphere and within the duskside plume, whereas higher‐frequency waves (<jats:italic>ω</jats:italic> > 20 <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgra20776-math-0002.gif" xlink:title="image"/> are excited over a broad spatial region of low density outside the morningside plasmasphere.</jats:p>

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