Wave‐particle interaction in a plasmaspheric plume observed by a Cluster satellite

Yuan, Zhiyong; Xiong, Ying; Pang, Y.; Zhou, Meng; Deng, Xiaohua; Trotignon, J. G.; Lucek, E.; Wang, Jingfang

doi:10.1029/2011ja017152

Cited by 47 publications

(73 citation statements)

References 80 publications

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“…As shown in Fig. 5a the O + ion gyrofrequency (f O + eq ) and the He + ion gyrofrequency (f He + eq ) in the equatorial plane, i.e., in frequency range for He + ion cyclotron waves in the equatorial plane, in agreement with the previous observations and theory of EMIC waves (Erlandson and Ukhorskiy, 2001;Morley et al, 2009;Yuan et al, 2010Yuan et al, , 2012aYoung et al, 1981). As shown in Fig.…”

Section: Discussionsupporting

confidence: 79%

“…With density enhancements of cold ions, the anisotropic RC proton distributions can become unstable so as to easily excite EMIC waves (Gary et al, 1995). Therefore, EMIC waves in the inner magnetosphere may occur in the region of overlap between the plasmasphere and ring currents (Fraser and Nguyen, 2001;Yuan et al, 2010Yuan et al, , 2012aUsanova et al, 2013), and in regions of high cold plasma density (Yahnin et al, 2002;Halford et al, 2015). In addition, the density structure with the negative gradient of radial electron densities at the plasmapause or plasmaspheric plumes can guide EMIC waves, leading to a small wave normal angle and an order of enhancement of the wave strength (Chen et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…With a 25.6 s running time window, the high-resolution magnetic fields observed by the FGM are separated into the averaged magnetic field and perturbed magnetic field (Yuan et al, 2012a). The perturbed magnetic field is used to extract the Pc2 waves.…”

Section: Observationsmentioning

confidence: 99%

“…In the dayside outer magnetosphere, EMIC waves in Pc2 band can also be generated high off the equator and in the regions of the minimum of magnetic field within Shabansky orbits (Liu et al, 2012). Through the wave-particle interactions, EMIC waves can scatter ring current (RC) ions and radiation belt relativistic electrons into the loss cone, leading to loss into the atmosphere (Yahnin et al, 2006;Jordanova, et al, 2007;Sakaguchi et al, 2008;Morley et al, 2009;Yuan et al, 2010Yuan et al, , 2012aYuan et al, , b, 2013Carson et al, 2013;Li et al, 2014;Usanova et al, 2010Usanova et al, , 2014. Therefore, EMIC waves may play an important role in the dynamics of the ring current and radiation belt through wave-particle interaction.…”

Section: Introductionmentioning

confidence: 99%

“…EMIC waves are usually observed in regions of higher cold plasma density such as, but necessarily in the plasmapause or plasmaspheric plumes (Anderson et al, 1992;Fraser and Nguyen, 2001;Chen et al, 2010;Yuan et al, 2012a;Usanova et al, 2013;Halford et al, 2015), because cold dense ions can lead to lower instability threshold for the EMIC wave excitation (Gary et al, 1995). EMIC waves, identified on the ground as Pc1-2 waves, are often excited in the magnetospheric equatorial plane (Anderson et al, 1992;Fraser et al, 2005;Engebretson et al, 2007;Yuan et al, 2012a;Sakaguchi et al, 2008). In the dayside outer magnetosphere, EMIC waves in Pc2 band can also be generated high off the equator and in the regions of the minimum of magnetic field within Shabansky orbits (Liu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Energetic ions scattered into the loss cone with observations of the Cluster satellite

2016

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Abstract. In this paper, we report in situ observations by the Cluster spacecraft of energetic ions scattered into the loss cone during the inbound pass from the plasma sheet into the plasmasphere. During the inbound pass of the plasma sheet, Cluster observed the isotropy ratio of energetic ions to gradually decrease from unity and the isotropic boundary extended to lower L value for higher-energy ions, implying that the field line curvature scattering mechanism is responsible for the scattered ions into the loss cone from the plasma sheet. In the outer boundary of a plasmasphere plume, Cluster 3 observed the increase of the isotropy ratio of energetic ions accompanied by enhancements of Pc2 waves with frequencies between the He + ion gyrofrequency and O + ion gyrofrequency estimated in the equatorial plane. Those Pc2 waves were left-hand circularly polarized and identified as electromagnetic ion cyclotron (EMIC) waves. Using the observed parameters, the calculations of the pitch angle diffusion coefficients for ring current protons demonstrate that EMIC waves could be responsible for the ions scattering and loss-cone filling. Our observations provide in situ evidence of energetic ion loss in the plasma sheet and the plasmasphere plume. Our results suggest that energetic ions scattering into the loss cone in the central plasma sheet and the outer boundary of the plasmaspheric plume are attributed to the field line curvature scattering mechanism and EMIC wave scattering mechanism, respectively.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energetic ions scattered into the loss cone with observations of the Cluster satellite

2016

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Cold electron heating by EMIC waves in the plasmaspheric plume with observations of the Cluster satellite

Yuan

Xiong

Huang

et al. 2014

Geophys. Res. Lett.

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We report in situ observations by the Cluster spacecraft of plasmaspheric electron heating in the plasmaspheric plume. Electron heating events were accompanied by enhancements of electromagnetic ion cyclotron (EMIC) waves in the increased density ducts on the negative density gradient side for two substructures of the plasmaspheric plume. Electron heating is much stronger for the pitch angle of 0°and 180°than for the pitch angle of 90°. Theoretical calculations of the Landau resonant interaction between electrons and observed EMIC waves demonstrate that Landau damping of oblique EMIC waves is a reasonable candidate to heat cold electrons in the presence of O + ions in the outer boundary of the plasmaspheric plume. Therefore, this observation is considered in situ evidence of plasmaspheric electron heating through Landau damping of EMIC waves in plasmaspheric plumes.

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Statistical characteristics of EMIC wave‐driven relativistic electron precipitation with observations of POES satellites: Revisit

Wang

Yuan

et al. 2014

JGR Space Physics

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Electromagnetic ion cyclotron (EMIC) waves play an important role in the magnetospheric dynamics and can scatter relativistic electrons in the outer radiation belt into the loss cone leading to the rapid loss of relativistic electrons. In this paper, we present characteristics of EMIC wave-driven relativistic electron precipitation (REP) with observations of six Polar Orbiting Environmental Satellites (POES). Based on the simultaneity between spikes in the P1 0°(Ep = 30 keV-80 keV) and P6 0°(Ee > 1 MeV) channels, in comparison with the criterion of Carson et al. (2013), we improve the algorithm and make it stricter. A total of 436,286 individual half orbits between 1998 and 2010 are inspected by this algorithm. The majority of selected events are observed at L values within the outer radiation belt (3 < L < 7) and more common in 1800-2200 magnetic local time. The distribution of normalized events follows the location of plasmapause contracting toward lower L value with the decrease of the Dst index, implying a strong link between detected events and the plasmapause. The cluster of normalized events moves to later afternoon sector where the peak occurrence of plasmaspheric plumes is located during geomagnetic storms. It is suggested that there is a connection between plasmaspheric plumes and detected events. Corresponding to the peak of event occurrence in 2003, solar wind dynamic pressure has a same peak. In addition, the minimum values of them are coincident. These results indicate that the increase of the solar wind dynamic pressure enhances the likelihood of EMIC wave-driven relativistic electron precipitation.

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Wave‐particle interaction in a plasmaspheric plume observed by a Cluster satellite

Cited by 47 publications

References 80 publications

Energetic ions scattered into the loss cone with observations of the Cluster satellite

Energetic ions scattered into the loss cone with observations of the Cluster satellite

Cold electron heating by EMIC waves in the plasmaspheric plume with observations of the Cluster satellite

Statistical characteristics of EMIC wave‐driven relativistic electron precipitation with observations of POES satellites: Revisit

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