On nonlinear cascades and resonances in the outer magnetosphere

Savin, S.; Amata, E.; Budaev, V.P.; Zelenyǐ, L. M.; Kronberg, Elena A.; Buechner, J.; Šafránková, Jana; Němeček, Zdenek; Błȩcki, J.; Kozak, L.V.; Климов, С. И.; Skalsky, A.; Lezhen, L. A.

doi:10.1134/s002136401401010x

Cited by 21 publications

(31 citation statements)

References 17 publications

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“…Each line constitutes a certain proportional change in this quantity. It is clear that this threshold is lowest for Savin et al (2008), which again was based on the approximate start position of the non-Gaussian tail, while the one of Savin et al (2014) was the highest. For the two criteria which have identified the most transients using dynamic pressure, and , the former has the lower threshold and hence should identify more events.…”

Section: Comparisonmentioning

confidence: 97%

“…A number of studies have simply labelled the transients as "enhancements" or "pulses" in said physical quantity, however the most common term to date has been as "jets" of some description. A similar term "plasma stream" was used by Savin et al (2014). It should be noted that some "jets" may not necessarily have an enhancement in the magnetosheath flow velocity, though such cases are in the minority (e.g.…”

Section: Physical Quantities and Nomenclaturementioning

confidence: 99%

“…Hietala et al (2009Hietala et al ( , 2012 and Savin et al (2014) highlight in their respective nomenclature the supermagnetosonic (being faster than the local magnetosonic wave speed v ms,msh ) nature of the flows, uncommon for shocked plasma in the dayside magnetosheath. However, the identification criterion of Savin et al (2014) does not strictly depend on the magnetosonic Mach number so in this case the transients being labelled as supermagnetosonic is technically something of a misnomer. Dmitriev and Suvorova (2015) use the term "large-scale" when discussing their jets.…”

Section: Physical Quantities and Nomenclaturementioning

confidence: 99%

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Jets Downstream of Collisionless Shocks

et al. 2018

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The magnetosheath flow may take the form of large amplitude, yet spatially localized, transient increases in dynamic pressure, known as "magnetosheath jets" or "plasmoids" among other denominations. Here, we describe the present state of knowledge with respect to such jets, which are a very common phenomenon downstream of the quasi-parallel bow shock. We discuss their properties as determined by satellite observations (based on both case and statistical studies), their occurrence, their relation to solar wind and foreshock conditions, and their interaction with and impact on the magnetosphere. As carriers of plasma and corresponding momentum, energy, and magnetic flux, jets bear some similarities to bursty bulk flows, which they are compared to. Based on our knowledge of jets in the near Earth environment, we discuss the expectations for jets occurring in other planetary and

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Section: Comparisonmentioning

confidence: 97%

Section: Physical Quantities and Nomenclaturementioning

confidence: 99%

Section: Physical Quantities and Nomenclaturementioning

confidence: 99%

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Jets Downstream of Collisionless Shocks

et al. 2018

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“…Magnetopause compression and penetration of magnetosheath plasma into the magnetosphere was found by Dmitriev and Suvorova (2012). The role of three-wave cascades and turbulence in connection with jets and plasma transport at the magnetopause was studied by Savin et al (2014).…”

Section: H Gunell Et Al: Waves and Plasmoidsmentioning

confidence: 99%

Waves in high-speed plasmoids in the magnetosheath and at the magnetopause

et al. 2014

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Abstract. Plasmoids, defined here as plasma entities with a higher anti-sunward velocity component than the surrounding plasma, have been observed in the magnetosheath in recent years. During the month of March 2007 the Cluster spacecraft crossed the magnetopause near the subsolar point 13 times. Plasmoids with larger velocities than the surrounding magnetosheath were found on seven of these 13 occasions. The plasmoids approach the magnetopause and interact with it. Both whistler mode waves and waves in the lower hybrid frequency range appear in these plasmoids, and the energy density of the waves inside the plasmoids is higher than the average wave energy density in the magnetosheath. When the spacecraft are in the magnetosphere, Alfvénic waves are observed. Cold ions of ionospheric origin are seen in connection with these waves, when the wave electric and magnetic fields combine with the Earth's dc magnetic field to yield an E × B/B 2 drift speed that is large enough to give the ions energies above the detection threshold.

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“…Possible processes responsible for the loss at the dayside are reconnection with the northward directed IMF (Kasahara et al 2008) or (2006) with observations of O + intensity at >274 keV measured by Cluster/RAPID in the plasma sheet at AE < 150 nT and AE > 300 nT, respectively the southward directed IMF , drift losses (mainly triggered by the solar wind dynamic pressure which changes the magnetopause shape; this is also applicable to the nightside plasma sheet) and due to the interaction with Pc 5 waves when the ion kinetic energy drops below the level required to overcome the convection potential, wherefore the ion is lost at the dayside magnetopause by sunward drift (Li et al 1993;Yang et al 2011). Supermagnetosonic plasma streams can lead to the escape of O + from the magnetosphere (Savin et al 2014). Also, the interaction with CIRs leads to the escape of ions through the whole magnetosphere (Kronberg et al 2011;Wei et al 2012).…”

Section: Bulk Properties and Global Modelsmentioning

confidence: 99%

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

et al. 2014

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Knowledge of the ion composition in the near-Earth's magnetosphere and plasma sheet is essential for the understanding of magnetospheric processes and instabilities. The presence of heavy ions of ionospheric origin in the magnetosphere, in particular oxygen (O + ), influences the plasma sheet bulk properties, current sheet (CS) thickness and its structure. It affects reconnection rates and the formation of Kelvin-Helmholtz instabilities. This has profound consequences for the global magnetospheric dynamics, including geomagnetic storms and substorm-like events. The formation and demise of the ring current and the radiation belts are also dependent on the presence of heavy ions. In this review we cover recent advances in observations and models of the circulation of heavy ions in the magne- tosphere, considering sources, transport, acceleration, bulk properties, and the influence on the magnetospheric dynamics. We identify important open questions and promising avenues for future research.

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On nonlinear cascades and resonances in the outer magnetosphere

Cited by 21 publications

References 17 publications

Jets Downstream of Collisionless Shocks

Jets Downstream of Collisionless Shocks

Waves in high-speed plasmoids in the magnetosheath and at the magnetopause

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

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