Group‐standing of whistler mode waves near the Moon

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  • Y. Tsugawa
    Department of Geophysics, Graduate School of Science Tohoku University Sendai Japan
  • Y. Katoh
    Department of Geophysics, Graduate School of Science Tohoku University Sendai Japan
  • N. Terada
    Department of Geophysics, Graduate School of Science Tohoku University Sendai Japan
  • T. Ono
    Department of Geophysics, Graduate School of Science Tohoku University Sendai Japan
  • H. Tsunakawa
    Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo Japan
  • F. Takahashi
    Department of Earth and Planetary Sciences, Faculty of Science Kyushu University Fukuoka Japan
  • H. Shibuya
    Department of Earth and Environmental Sciences Kumamoto University Kumamoto Japan
  • H. Shimizu
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • M. Matsushima
    Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo Japan

書誌事項

公開日
2014-04
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2013ja019585
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Narrowband whistler mode waves with frequencies near 1 Hz have been observed near the Moon. We reveal that the narrowband spectra, the frequency concentration near 1 Hz, and the relations between the wave vector, magnetic field vector, and sunward directions can be explained by a condition in which the group velocity vector is almost canceled by the solar wind velocity vector in the spacecraft frame. Hereafter, we refer to this condition as the group‐standing condition. The spectral density is modified and has a peak at the frequency satisfying the group‐standing condition because of the difference of the frequency width between the solar wind plasma frame and the spacecraft frame. In addition, if the waves were decelerated to be group‐standing, the conservation of the energy flux results in the intensification of the wave amplitude at that frequency. We also derive the analytical expression of the amount of the modifications, which depend on the group velocity. These effects can explain the narrowband spectra near 1 Hz and support the relations between the wave vector, magnetic field vector, and sunward directions. The estimated frequency which satisfies the group‐standing condition is in good agreement with the observed frequency within error bars of the estimation. Considering the group‐standing condition, we suggest that the narrowband waves observed in the spacecraft frame are originated from oblique whistler mode waves in the frequencies near the lower hybrid frequency, which are possibly generated by reflected ions from the lunar magnetic anomalies.</jats:p>

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