The spatial structure of ULF-waves in the equatorial resonator localized at the plasmapause with the admixture of the heavy ions

Mikhailova, Olga S.

doi:10.1016/j.jastp.2013.12.007

Cited by 12 publications

(5 citation statements)

References 32 publications

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“…Recent hybrid simulations by Hu and Denton [2009] and Hu et al [2010] have showed that the waves can be Ρ-waves are not channeled by an external magnetic field and often propagate across its direction. Both types of waves can be captured in waveguides and resonators, both longitudinal and transverse with respect to the magnetic field [Mazur and Potapov, 1983;Guglielmi et al, 2000;Mikhailova, 2014]. One of the most probable locations of resonators is plasmapause [Guglielmi et al, 1975;Mazur and Potapov, 1983;Henning and Mace, 2014].…”

Section: Discussionmentioning

confidence: 99%

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission

et al. 2017

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Electromagnetic ion cyclotron (EMIC) waves can precipitate the ring current ions and relativistic electrons and heat the cold electrons in the magnetosphere. This requires comprehensive knowledge of the occurrence and wave properties of EMIC waves. In the present study, we used the data from one new mission, the Magnetospheric Multiscale (MMS) mission launched in March 2015, to investigate the occurrence and wave properties of H+‐band and He+‐band EMIC waves in the magnetosphere. Our statistical results show the following: (1) H+‐band EMIC waves mostly occur in the higher L‐shells (L > 5) while He+‐band EMIC waves are mostly observed in the lower L‐shells (L < 6). (2) The occurrence rate of H+‐band EMIC waves in the dayside is higher than that in the nightside. The highest peak of occurrence rate of H+‐band EMIC waves is in the postnoon sector (5–8 L‐shells), and the secondary peak lies in the small area of the dawn sector. (3) The wave power spectral density peaks in the postnoon and predusk sectors, while the wave normal angles are largest in the dawn sector. (4) Linear and right‐hand polarized H+‐band EMIC waves are mainly in the regions of peak occurrence, while linear polarized waves are seen to also dominate outside of the regions of peak occurrence. The highest occurrence rate of linear polarized He+‐band EMIC waves is observed in the dawn sector. We discussed the results and compared with previous findings.

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Section: Discussionmentioning

confidence: 99%

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission

et al. 2017

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“…The less studied is the wave's structure across the magnetic shells. It is well known that the Alfvén waves can form resonators across the magnetic shell due to various effects beyond the one-fluid Magnetohydrodynamics, such as electron inertia (Gulélmi & Polyakov, 1983), finite ion Larmor radius (Dai, 2009;Leonovich et al, 1983), ion gyrofrequency (Dmitrienko & Mazur, 1992;Mikhailova, 2014), and finite conductivity (Churilov, 2002). In these cases, the Alfvén wave has discrete spectrum, and its transverse structure is determined by superposition of several transverse eigenfunctions.…”

Section: Introductionmentioning

confidence: 99%

Eigenmodes of the Transverse Alfvénic Resonator at the Plasmapause: A Van Allen Probes Case Study

Mager

Mikhailova

Mager

et al. 2018

Geophysical Research Letters

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A Pc4 ultralow frequency wave was detected at spacecraft B of the Van Allen Probes at the plasmapause. A distinctive feature of this wave is the strong periodical modulation of the wave. It is assumed that this modulation is a beating of oscillations close in frequency: at least two harmonics with frequencies of 15.3 and 13.6 MHz are found. It is shown that these harmonics can be the eigenmodes of the transverse resonator at the local maximum of the Alfvén velocity. In addition, the observed wave was in a drift resonance with energetic 80-keV protons and could be generated by an unstable bump on tail distribution of protons simultaneously observed with the wave. The estimate of the azimuthal wave number m made from the drift resonance condition gives a value of about −100, that is, it is a westward propagating azimuthally small-scale wave. Plain Language SummaryThe study presented in this paper can be considered as the first direct experimental confirmation of the existence of the transverse Alfvénic resonators on the plasmapause exited by the kinetic instabilities in the hot plasma component. An Alfvén wave was detected by the Radiation Belt Storm Probes spacecraft B spacecraft on 23 October 2012 at the outer edge of the plasmapause where Alfvén velocity has a local maximum. The wave had strong amplitude modulation of the magnetic and electric fields. This amplitude modulation was the result of the superposition of (at least) two harmonics with close frequencies 15.3 and 13.6 mHz. We suppose that these harmonics are eigenmodes of the transverse Alfvénic resonator at the plasmapause. Moreover, the energetic proton fluxes were strongly modulated by the wave at energies near 80 keV. Assuming the drift wave-particle resonance, we found that the wave was azimuthally small-scale westward propagating wave with the azimuthal wavelength at the geomagnetic equator about 0.3 Earth's radius. The wave was probably generated by the instability caused by the inverted (bump on tail) proton distribution for energies below 84.4 keV.

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“…Admixture of heavy ions can also cause the near-equatorial locking of the left-hand polarized ion-cyclotron (EMIC) waves [32][33][34][35]. In this case the wave polarization is quasicircular, that is, the wave must have both radial E r and azimuthal E r components of the electric field.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, it can be seen from figure 3 that in addition to the equatorial transparent region, there are two other transparent regions localized near the ionosphere of the Northern and Southern hemispheres [55]. These regions are separated from the equatorial resonator by the opaque regions where < k 0 2  .…”

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confidence: 91%

Two modes of ion-ion hybrid waves in magnetospheric plasma

Mikhailova

Mager

Klimushkin

2019

Plasma Phys. Control. Fusion

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This paper is concerned with the structure of ion-ion hybrid (IIH) waves in multicomponent magnetospheric plasma in the dipole geomagnetic field model. Like Alfvén waves, in IIH waves the field line can oscillate in different directions: in the azimuthal direction (the toroidal modes) and in the radial direction (the poloidal modes). Contrary to Alfvén waves, in IIH waves only the equatorial part of the field line can oscillate, since due to the heavy ions admixture the IIH waves are trapped in the resonator in the vicinity of the geomagnetic equator. The equatorial localization of the waves allow the calculation of the parallel structure of the toroidal and poloidal IIH modes analytically. It was found that the toroidal and poloidal modes have slightly different structures and that their frequencies are also slightly different. The difference between toroidal and poloidal frequencies (the polarization splitting) is small with respect to the basic harmonics of each mode. It was found that IIH modes have a considerable compressional component of the wave's magnetic field.

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The spatial structure of ULF-waves in the equatorial resonator localized at the plasmapause with the admixture of the heavy ions

Cited by 12 publications

References 32 publications

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission

Eigenmodes of the Transverse Alfvénic Resonator at the Plasmapause: A Van Allen Probes Case Study

Two modes of ion-ion hybrid waves in magnetospheric plasma

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