Turbulent boundary layer at the border of geomagnetic trap

Savin, S.; Zelenyǐ, L. M.; Романов, С. А.; Климов, С. И.; Skalsky, A.; Galeev, A. A.; Смирнов, В. Н.; Nozdrachev, M. N.; Yermolaev, Yu. I.; Avanov, L. A.; Amata, E.; Błȩcki, J.; Buechner, J.; Nikutowski, B.; Dubinin, E.; Němeček, Z.; Šafránková, Jana; Pedersen, Å.; Rauch, Jean-Louis; Rustenbach, J.; Sauvaud, J. A.; Song, P.; Stasiewicz, K.

doi:10.1134/1.1450288

Cited by 30 publications

(27 citation statements)

References 2 publications

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“…The operation of the bursty reconnection for the locally anti-parallel fields over the cusp is in agreement with a number of studies, and the experimental evidences for the permanent by-product reconnection of the TBL is strongly fluctuating fields are seen as well (see e.g. Savin et al, 1998bSavin et al, , 2001Savin et al, , 2002aMerka et al, 2000;Onsager et al, 2001;Dubinin et al, 2001).…”

Section: Discussionsupporting

confidence: 71%

“…At 09:00-10:50 UT in the MP vicinity wideband Interball-1 fluctuations are seen, most of them have no counterparts in SW. Note the multiple spectral maxima in this region, which we call "TBL" (see Savin et al, 1998Savin et al, , 2001Savin et al, , 2002a, which are tied in a complicated manner. Similar to frequencies higher than 0.7 mHz, the disturbances in the TBL have a higher level and a different frequency dependence, as compared with MSH; we think that the MSH is not the major source for the fluctuations in TBL.…”

Section: Interball-1 Tbl Tracing On 19 June 1998mentioning

confidence: 99%

“…It implies that the transverse magnetic fluctuations dominate over the compressible ones (cf. Savin et al, 1998bSavin et al, , 2001Savin et al, , 2002a. To estimate the scale of the kink in Fig.…”

Section: Interball-1 Tbl Tracing On 19 June 1998mentioning

confidence: 99%

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On the properties of turbulent boundary layer over polar cusps

Savin

Büchner

Consolini

et al. 2002

Nonlin. Processes Geophys.

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Abstract. We study properties of nonlinear magnetic fluctuations in the turbulent boundary layer (TBL) over polar cusps during a typical TBL crossing on 19 June 1998. Interball-1 data in the summer TBL are compared with that of Geotail in solar wind (SW) and Polar in the northern TBL. In the TBL two characteristic slopes are seen: ∼ − 1 at (0.004-0.08) Hz and ∼ − 2.2 at (0.08-2) Hz. We present evidences that random current sheets with features of coherent solitons can result in: (i) slopes of ∼ − 1 in the magnetic power spectra; (ii) demagnetization of the SW plasma in "diamagnetic bubbles"; (iii) nonlinear, presumably, 3-wave phase coupling with cascade features; (iiii) departure from the Gaussian statistics. We discuss the above TBL properties in terms of intermittency and self-organization of nonlinear systems, and compare them with kinetic simulations of reconnected current sheet at the nonlinear state. Virtual satellite data in the model current sheet reproduce valuable cascade-like spectral and bi-spectral properties of the TBL turbulence.

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Section: Discussionsupporting

confidence: 71%

Section: Interball-1 Tbl Tracing On 19 June 1998mentioning

confidence: 99%

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On the properties of turbulent boundary layer over polar cusps

Savin

Büchner

Consolini

et al. 2002

Nonlin. Processes Geophys.

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“…1 corresponds to "plasma ball" of Savin et al (2002Savin et al ( , 2005a. The strong fluctuations between stagnant MSH and outer cusp in the cases of Savin et al (2001) isolate them, while in our case a "plasma ball" represents the interior large-scale reservoir for magnetospheric plasma. First of all, it should be remembered that at the high-latitude MP we often deal with interaction of a high-beta incident plasma with a higher-beta one (cf.…”

Section: Mp Shape Motion and Chargingmentioning

confidence: 99%

Experimental study of nonlinear interaction of plasma flow with charged thin current sheets: 2. Hall dynamics, mass and momentum transfer

Savin

Amata

André

et al. 2006

Nonlin. Processes Geophys.

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Abstract.Proceeding with the analysis of Amata et al. (2005), we suggest that the general feature for the local transport at a thin magnetopause (MP) consists of the penetration of ions from the magnetosheath with gyroradius larger than the MP width, and that, in crossing it, the transverse potential difference at the thin current sheet (TCS) is acquired by these ions, providing a field-particle energy exchange without parallel electric fields. It is suggested that a part of the surface charge is self-consistently produced by deflection of ions in the course of inertial drift in the nonuniform electric field at MP.Consideration of the partial moments of ions with different energies demonstrates that the protons having gyroradii of roughly the same size or larger than the MP width carry fluxes normal to MP that are about 20% of the total flow in the plasma jet under MP. This is close to the excess of the ion transverse velocity over the cross-field drift speed in the plasma flow just inside MP (Amata et al., 2005), which conforms to the contribution of the finite-gyroradius inflow across MP. A linkage through the TCS between different plasmas results from the momentum conservation of the Correspondence to: S. Savin (ssavin@iki.rssi.ru) higher-energy ions. If the finite-gyroradius penetration occurs along the MP over ∼1.5 R E from the observation site, then it can completely account for the formation of the jet under the MP. To provide the downstream acceleration of the flow near the MP via the cross-field drift, the weak magnetic field is suggested to rotate from its nearly parallel direction to the unperturbed flow toward being almost perpendicular to the accelerated flow near the MP.We discuss a deceleration of the higher-energy ions in the MP normal direction due to the interaction with finite-scale electric field bursts in the magnetosheath flow frame, equivalent to collisions, providing a charge separation. These effective collisions, with a nonlinear frequency proxy of the order of the proton cyclotron one, in extended turbulent zones are a promising alternative in place of the usual parallel electric fields invoked in the macro-reconnection scenarios. Further cascading towards electron scales is supposed to be due to unstable parallel electron currents, which neutralize the potential differences, either resulted from the ion-burst interactions or from the inertial drift.The complicated MP shape suggests its systematic velocity departure from the local normal towards the average one, inferring domination for the MP movement of the non-local processes over the small-scale local ones.Published by Copernicus GmbH on behalf of the European Geosciences Union and the American Geophysical Union. The measured Poynting vector indicates energy transmission from the MP into the upstream region with the waves triggering impulsive downstream flows, providing an input into the local flow balance and the outward movement of the MP.Equating the transverse electric field inside the MP TCS by the Hall term in the Ohm's law ...

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“…The cusp often exhibits the characteristics of low-frequency electromagnetic turbulence [Sundkvist et al, 2005;Savin et al, 2001]. Cluster spacecraft observations [Sundkvist et al, 2005] in the high-altitude cusp found KAWs with frequencies less than the ion gyrofrequency.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear coupling of kinetic Alfvén waves and magnetosonic waves in plasma

Sharma

Kumar

2011

J. Geophys. Res.

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[1] This paper presents the model equations governing the nonlinear interaction between kinetic Alfvén waves and magnetosonic waves in plasmas (having b ) m e /m i ). The nonlinear dynamical equation satisfies the modified Zakharov system of equations by taking the nonadiabatic response of the density in the form of a magnetosonic wave. We solved these model equations with numerical simulations and showed that the system becomes turbulent as it evolves. The localized magnetic filamentary structures are found in the solar wind at 1 AU. Magnetic power spectra at different times and spectral indices are calculated. The relevance of the present investigation to recent solar wind turbulence observations by Cluster is pointed out. In the present paper, two types of scaling, k −3.4 and k −3.6 , are observed. The chaotic behavior of the localized structures and steeper spectra (of power law k −S , 5/3 ≤ S ≤ 5.3) can be responsible for plasma heating and particle acceleration in solar wind.

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Turbulent boundary layer at the border of geomagnetic trap

Cited by 30 publications

References 2 publications

On the properties of turbulent boundary layer over polar cusps

On the properties of turbulent boundary layer over polar cusps

Experimental study of nonlinear interaction of plasma flow with charged thin current sheets: 2. Hall dynamics, mass and momentum transfer

Nonlinear coupling of kinetic Alfvén waves and magnetosonic waves in plasma

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