Oxygen cyclotron harmonic waves in the deep plasmasphere during magnetic storms | Zendy

Pokhotelov O. A. | Zendy; Pokhotelov D. O. | Zendy; Feygin F. Z. | Zendy; Gladychev V. A. | Zendy; Parrot M. | Zendy; Hayashi K. | Zendy; Kangas J. | Zendy; Mursula K. | Zendy

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Oxygen cyclotron harmonic waves in the deep plasmasphere during magnetic storms

Author(s) -

Pokhotelov O. A.,

Pokhotelov D. O.,

Feygin F. Z.,

Gladychev V. A.,

Parrot M.,

Hayashi K.,

Kangas J.,

Mursula K.

Publication year - 1997

Publication title -

journal of geophysical research: space physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/96ja03067

Subject(s) - plasmasphere , physics , magnetosphere , cyclotron , geophysics , ring current , ion , instability , computational physics , geomagnetic storm , ionosphere , atomic physics , plasma , mechanics , solar wind , nuclear physics , quantum mechanics

A new approach to the generation of storm‐associated ULF waves with discrete spectra (ion cyclotron harmonic waves) observed in the equatorial plasmasphere is presented. It is proposed that the appearance of waves with phase velocities smaller than the Alfvén velocity is connected with a strong dispersion of magnetosonic waves near the bi‐ion frequency occurring in the presence of oxygen ions of ionospheric origin. The waves are generated by an instability involving hot oxygen ions with loss cone or ring like distributions. Such ions are found in the magnetosphere during magnetic storms. A simple analytical model of this instability is elaborated. It is shown that ULF wave observations on board Akebono satellite are in a reasonable agreement with the present theoretical approach.

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