Impulsively Excited Nightside Ultralow Frequency Waves Simultaneously Observed on and off the Magnetic Equator

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  • Kazue Takahashi
    The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
  • Richard E. Denton
    Department of Physics and Astronomy Dartmouth College Hanover NH USA
  • Tetsuo Motoba
    The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
  • Ayako Matsuoka
    Institute of Space and Astronautical Science Sagamihara Japan
  • Yasumasa Kasaba
    Department of Geophysics Tohoku University Sendai Japan
  • Yoshiya Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Mariko Teramoto
    Institute of Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Masafumi Shoji
    Institute of Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Naoko Takahashi
    Graduate School of Science, Department of Earth and Planetary Science The University of Tokyo Tokyo Japan
  • Yoshizumi Miyoshi
    Institute of Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Masahito Nosé
    Graduate School of Science Kyoto University Kyoto Japan
  • Atsushi Kumamoto
    Department of Geophysics Tohoku University Sendai Japan
  • Fuminori Tsuchiya
    Department of Geophysics Tohoku University Sendai Japan
  • Robert J. Redmon
    National Centers for Environmental Information National Oceanic and Atmospheric Administration Boulder CO USA
  • Juan V. Rodriguez
    National Centers for Environmental Information National Oceanic and Atmospheric Administration Boulder CO USA

書誌事項

公開日
2018-08-17
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gl078731
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The Arase spacecraft is capable of observing ultralow frequency waves in the inner magnetosphere at intermediate magnetic latitudes, a region sparsely covered by previous spacecraft missions. We report a series of impulsively excited fundamental toroidal mode standing Alfvén waves in the midnight sector observed by Arase outside the plasmasphere at magnetic latitudes 13–24°. The wave onsets are concurrent with Pi2 onsets detected by the Van Allen Probe B spacecraft at the magnetic equator in the duskside plasmasphere and by ground magnetometers at low latitudes. The duration of each toroidal wave packet is ∼20 min, which is much longer than that of the corresponding Pi2 wave packet. The toroidal waves cannot be the source of high‐latitude Pi2 waves because they were not detected on the ground near the magnetic field footprint of Arase. Overall, the toroidal wave event lasted more than 2 hr and allowed us to use the wave frequency to estimate the plasma mass density at <jats:italic>L</jats:italic> = 6.1–8.3. The mass density (in amu/cm<jats:sup>3</jats:sup>) is higher than the electron density (cm<jats:sup>−3</jats:sup>) by a factor of ∼6, which implies that 17–33% of the ions were O<jats:sup>+</jats:sup>.</jats:p>

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