Cluster observations of EMIC triggered emissions in association with Pc1 waves near Earth's plasmapause

Pickett, J. S.; Grison, B.; Omura, Yoshiharu; Engebretson, M. J.; Dandouras, I.; Masson, A.; Adrian, M. L.; Santolı́k, O.; Décréau, Pierrette; Cornilleau‐Wehrlin, N.; Constantinescu, Dragoş

doi:10.1029/2010gl042648

Cited by 142 publications

(183 citation statements)

References 33 publications

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“…Although EMIC waves have been intensively investigated [e.g, Kennel and Petschek, 1966;Young et al, 1981;Rauch and Roux, 1982;Roux et al, 1982;Anderson et al, 1996;Fraser and Nguyen, 2001;Halford et al, 2010;Pickett et al, 2010;Zhang et al, 2010Zhang et al, , 2011Min et al, 2012;Allen et al, 2013;Lin et al, 2014], plasma properties relevant to EMIC wave excitation have not been fully understood in the magnetosphere due to the wide spatial extent of EMIC wave generation and propagation. For example, Lin et al [2014] recently found that the correlation of positive A hp events, EMIC instability threshold (Σ h > S h ), and EMIC waves observed by the polar-orbiting Cluster spacecraft is low.…”

Section: Discussionmentioning

confidence: 99%

“…EMIC waves are preferentially generated in regions where hot anisotropic H + and cold dense ion populations spatially overlap [e.g., Jordanova et al, 2001;Pickett et al, 2010;Zhang et al, 2011]. In the terrestrial magnetosphere, these ion populations can commonly be found where the ring current overlaps the plasmasphere or plasmaspheric plumes [Gurgiolo et al, 2005;Thorne, 2010].…”

Section: Introductionmentioning

confidence: 99%

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Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

Zhang

Saikin

Kistler

et al. 2014

Geophysical Research Letters

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We report the wave observations, associated plasma measurements, and linear theory testing of electromagnetic ion cyclotron (EMIC) wave events observed by the Van Allen Probes on 28 April 2013. The wave events are detected in their generation regions as three individual events in two consecutive orbits of Van Allen Probe-A, while the other spacecraft, B, does not detect any significant EMIC wave activity during this period. Three overlapping H + populations are observed around the plasmapause when the waves are excited. The difference between the observational EMIC wave growth parameter (Σ h ) and the theoretical EMIC instability parameter (S h ) is significantly raised, on average, to 0.10 ± 0.01, 0.15 ± 0.02, and 0.07 ± 0.02 during the three wave events, respectively. On Van Allen Probe-B, this difference never exceeds 0. Compared to linear theory (Σ h > S h ), the waves are only excited for elevated thresholds.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

Zhang

Saikin

Kistler

et al. 2014

Geophysical Research Letters

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“…EMIC waves can cause rapid scattering and loss for ring current ions (Jordanova et al 2001b) and relativistic electrons above 0.5 MeV (Thorne and Kennel 1971;Lyons and Thorne 1973;Albert 2003;Summers and Thorne 2003;Meredith et al 2003b). Favored regions for EMIC excitation include the overlap between the ring current and the plasmasphere (Pickett et al 2010), dayside drainage plumes (Morley et al 2009), and the outer dayside magnetosphere in association with solar wind pressure fluctuations (Arnoldy et al 2005;Usanova et al 2008;McCollough et al 2009). Theoretical global modeling of EMIC wave excitation has confirmed the plasmapause and plume as favored regions of cyclotron resonant instability (Jordanova et al 2007;Chen et al 2010a) and demonstrated that the wave excitation can also be enhanced by density fluctuations within a plume (Chen et al 2009a).…”

Section: Fig 2 Spectrogram Of Waves Observed On Combined Release Andmentioning

confidence: 99%

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

et al. 2013

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The Electric and Magnetic Field Instrument and Integrated Science (EMFISIS) investigation on the NASA Radiation Belt Storm Probes (now named the Van Allen Probes) mission provides key wave and very low frequency magnetic field measurements to understand radiation belt acceleration, loss, and transport. The key science objectives and the contribution that EMFISIS makes to providing measurements as well as theory and modeling are described. The key components of the instruments suite, both electronics and sensors, including key functional parameters, calibration, and performance, demonstrate that EMFI-SIS provides the needed measurements for the science of the RBSP mission. The EMFISIS operational modes and data products, along with online availability and data tools provide the radiation belt science community with one the most complete sets of data ever collected.

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“…We still neglect the contributions of H + -and O + -mode EMIC waves in this study because He + -mode of EMIC waves is a dominant mode observed in the inner magnetosphere. We also do not consider the so-called EMIC rising tone emissions although they are observed in a close association with the Pc1 waves [Pickett et al, 2010]. There are two reasons why we do not include the EMIC rising tone emissions in our model at this point.…”

Section: Introductionmentioning

confidence: 99%

Model of electromagnetic ion cyclotron waves in the inner magnetosphere

et al. 2014

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Citation:Gamayunov, K. V., M. J. Engebretson, M. Zhang, and H. K. Rassoul (2014) Abstract The evolution of He + -mode electromagnetic ion cyclotron (EMIC) waves is studied inside the geostationary orbit using our global model of ring current (RC) ions, electric field, plasmasphere, and EMIC waves. In contrast to the approach previously used by Gamayunov et al. (2009), however, we do not use the bounce-averaged wave kinetic equation but instead use a complete, nonbounce-averaged, equation to model the evolution of EMIC wave power spectral density, including off-equatorial wave dynamics. The major results of our study can be summarized as follows. (1) The thermal background level for EMIC waves is too low to allow waves to grow up to the observable level during one pass between the "bi-ion latitudes" (the latitudes where the given wave frequency is equal to the O + -He + bi-ion frequency) in conjugate hemispheres. As a consequence, quasi-field-aligned EMIC waves are not typically produced in the model if the thermal background level is used, but routinely observed in the Earth's magnetosphere. To overcome this model-observation discrepancy we suggest a nonlinear energy cascade from the lower frequency range of ultralow frequency waves into the frequency range of EMIC wave generation as a possible mechanism supplying the needed level of seed fluctuations that guarantees growth of EMIC waves during one pass through the near equatorial region. The EMIC wave development from a suprathermal background level shows that EMIC waves are quasi field aligned near the equator, while they are oblique at high latitudes, and the Poynting flux is predominantly directed away from the near equatorial source region in agreement with observations. (2) An abundance of O + strongly controls the energy of oblique He + -mode EMIC waves that propagate to the equator after their reflection at bi-ion latitudes, and so it controls a fraction of wave energy in the oblique normals. waves generated by RC O + in the region L ≈ 2-3 may have an implication to the energetic particle loss in the inner radiation belt.

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Cluster observations of EMIC triggered emissions in association with Pc1 waves near Earth's plasmapause

Cited by 142 publications

References 33 publications

Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

Model of electromagnetic ion cyclotron waves in the inner magnetosphere

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