Sounding of the plasmasphere by Mid‐continent MAgnetoseismic Chain (McMAC) magnetometers

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  • P. J. Chi
    Institute of Geophysics and Planetary Physics and Department of Earth and Space Sciences University of California Los Angeles California USA
  • M. J. Engebretson
    Department of Physics Augsburg College Minneapolis Minnesota USA
  • M. B. Moldwin
    Department of Atmospheric, Oceanic and Space Sciences University of Michigan Ann Arbor Michigan USA
  • C. T. Russell
    Institute of Geophysics and Planetary Physics and Department of Earth and Space Sciences University of California Los Angeles California USA
  • I. R. Mann
    Department of Physics University of Alberta Edmonton Alberta Canada
  • M. R. Hairston
    William B. Hanson Center for Space Sciences University of Texas Dallas Richardson Texas USA
  • M. Reno
    Austin Mission Consulting Austin Texas USA
  • J. Goldstein
    Department of Space Sciences Southwest Research Institute San Antonio Texas USA
  • L. I. Winkler
    Department of Physics and Astronomy Minnesota State University Moorhead Moorhead Minnesota USA
  • J. L. Cruz‐Abeyro
    Centro de Geociencias Universidad Nacional Autónoma de México Juriquilla Querétaro Mexico
  • D.‐H. Lee
    School of Space Research Kyung Hee University Yongin Gyeonggi Korea
  • K. Yumoto
    International Center for Space Weather Science and Education Kyushu University Fukuoka Japan
  • R. Dalrymple
    Minnesota West Community and Technical College Worthington Minnesota USA
  • B. Chen
    Department of Computer and Electronics Engineering University of Nebraska‐Lincoln Omaha Nebraska USA
  • J. P. Gibson
    Kessler Atmospheric and Ecological Field Station University of Oklahoma Norman Oklahoma USA

書誌事項

公開日
2013-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/jgra.50274
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We present a statistical analysis on the plasmaspheric mass density derived from the field line resonance (FLR) observations by the Mid‐continent MAgnetoseismic Chain (McMAC). McMAC consists of nine stations in the United States and Mexico along the 330° magnetic longitude, spanning <jats:italic>L</jats:italic>‐values between 1.5 and 3.4. Using the gradient method and an automated procedure for FLR detection, we studied a full year of McMAC observations between July 2006 and June 2007. We find that the rate of FLR detection can reach as high as 56% around local noon at <jats:italic>L</jats:italic> = 2.7, and the detection rates at higher and lower <jats:italic>L</jats:italic>‐values decline due to the occasional presence of the plasmapause and weaker FLR signals, respectively. At <jats:italic>L</jats:italic>‐values between 1.8 and 3.1, the inferred equatorial plasma mass density follows the <jats:italic>L</jats:italic>‐dependence of <jats:italic>L</jats:italic><jats:sup>−4</jats:sup>. By comparing the mass density with the electron density, we found that the ion mass gradually decreased from 1.7 amu at <jats:italic>L</jats:italic> = 1.8 to 1 amu at <jats:italic>L</jats:italic> = 3.1. The plasma mass density exhibits an annual variation that maximizes in January, and at <jats:italic>L</jats:italic> = 2.4 the ratio between January and July densities is 1.6. Our observations also show a local time dependence of plasmaspheric mass density that stays steady in the morning and rises postnoon, a phenomenon that may be attributed to the equatorial ionization anomaly as a part of the plasma neutral coupling at low latitude.</jats:p>

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