Mirror instability in the magnetosphere of comet Halley

Russell, C. T.; Riedler, W.; Schwingenschuh, K.; Yeroshenko, Ye.

doi:10.1029/gl014i006p00644

Cited by 157 publications

(100 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 6 shows one example of a mirror mode. Other examples have been reported, including observations within the Earth's magnetosheath (Tsurutani et al, 1982;Tsurutani et al, 1984;Hubert et al, 1989;Lacombe et al, 1992;Fazakerley and Southwood, 1994a;Fazakerley et al, 1995), the Jovian environment Phillips et al, 1993), the Saturnian environment (Violante et al, 1995a, b), the Uranian environment , cometary environs (Russell et al, 1987;Mazelle et al, 1991;Glassmeier et al, 1993), and interplanetary space Winterhalter et al, 1994). The mirror mode is unstable in kinetic theory for temperature anisotropies satisfying (Hasegawa, 1969) which is similar to that found in mixed kinetic-fluid treatments, e.g.…”

Section: Mirror Modesmentioning

confidence: 57%

Low-frequency waves in the Earth's magnetosheath: present status

1996

View full text Add to dashboard Cite

Abstract. The terrestrial magnetosheath contains a rich variety of low-frequency (: proton gyrofrequency) fluctuations. Kinetic and fluid-like processes at the bow shock, within the magnetosheath plasma, and at the magnetopause all provide sources of wave energy. The dominance of kinetic features such as temperature anisotropies, coupled with the high-conditions, complicates the wave dispersion and variety of instabilities to the point where mode identification is difficult. We review here the observed fluctuations and attempts to identify the dominant modes, along with the identification tools. Alfve´n/ioncyclotron and mirror modes are generated by ¹ ,

show abstract

Section: Mirror Modesmentioning

confidence: 57%

Low-frequency waves in the Earth's magnetosheath: present status

1996

View full text Add to dashboard Cite

show abstract

“…From solar wind observations, these structures have sizes of tens to hundreds of proton thermal gyroradii, and are found predominantly in regions where the conditions are marginally mirror stable. 2 Similar MH structures, either as isolated events or as trains of structures, have now been observed across a wide range of plasma environments, in planetary magnetosheaths, 3,4 cometary environments, 5 the solar wind 1,6 and in the heliosheath. 7 The association of magnetic holes with regions of flow compression and enhanced perpendicular temperature anisotropy, such as the magnetosheath downstream of planetary bow shocks, indicates an association with the linear mirror instability with threshold b ?…”

Section: Introductionmentioning

confidence: 80%

Electron vortex magnetic holes: A nonlinear coherent plasma structure

et al. 2015

View full text Add to dashboard Cite

We report the properties of a novel type of sub-proton scale magnetic hole found in two dimensional particle-in-cell simulations of decaying turbulence with a guide field. The simulations were performed with a realistic value for ion to electron mass ratio. These structures, electron vortex magnetic holes (EVMHs), have circular cross-section. The magnetic field depression is associated with a diamagnetic azimuthal current provided by a population of trapped electrons in petal-like orbits. The trapped electron population provides a mean azimuthal velocity and since trapping preferentially selects high pitch angles, a perpendicular temperature anisotropy. The structures arise out of initial perturbations in the course of the turbulent evolution of the plasma, and are stable over at least 100 electron gyroperiods. We have verified the model for the EVMH by carrying out test particle and PIC simulations of isolated structures in a uniform plasma. It is found that (quasi-)stable structures can be formed provided that there is some initial perpendicular temperature anisotropy at the structure location. The properties of these structures (scale size, trapped population, etc.) are able to explain the observed properties of magnetic holes in the terrestrial plasma sheet. EVMHs may also contribute to turbulence properties, such as intermittency, at short scale lengths in other astrophysical plasmas. V C 2015 AIP Publishing LLC.

show abstract

“…close to Io (Russell et al, 1999), in the vicinity of comets (Russell et al, 1987), in the magnetosheaths of other planets (Bavassano Cattaneo et al, 1998;Volwerk et al, 2008a) and even in the induced magnetosphere of Venus (Volwerk et al, 2008b). Mirror mode structures were first detected in the terrestrial magnetosphere during storm times (Hasegawa, 1969).…”

Section: Introductionmentioning

confidence: 97%

Cluster and TC-1 observation of magnetic holes in the plasma sheet

Sun

Shi

et al. 2012

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. Magnetic holes with relatively small scale sizes, detected by Cluster and TC-1 in the magnetotail plasma sheet, are studied in this paper. It is found that these magnetic holes are spatial structures and they are not magnetic depressions generated by the flapping movement of the magnetotail current sheet. Most of the magnetic holes (93 %) were observed during intervals with B z larger than B x , i.e. they are more likely to occur in a dipolarized magnetic field topology. Our results also suggest that the occurrence of these magnetic holes might have a close relationship with the dipolarization process. The magnetic holes typically have a scale size comparable to the local proton Larmor radius and are accompanied by an electron energy flux enhancement at a 90 • pitch angle, which is quite different from the previously observed isotropic electron distributions inside magnetic holes in the plasma sheet. It is also shown that most of the magnetic holes occur in marginally mirror-stable environments. Whether the plasma sheet magnetic holes are generated by the mirror instability related to ions or not, however, is unknown. Comparison of ratios, scale sizes and propagation direction of magnetic holes detected by Cluster and TC-1, suggests that magnetic holes observed in the vicinity of the TC-1 orbit (∼7-12 R E ) are likely to be further developed than those observed by Cluster (∼7-18 R E ).

show abstract

Mirror instability in the magnetosphere of comet Halley

Cited by 157 publications

References 18 publications

Low-frequency waves in the Earth's magnetosheath: present status

Low-frequency waves in the Earth's magnetosheath: present status

Electron vortex magnetic holes: A nonlinear coherent plasma structure

Cluster and TC-1 observation of magnetic holes in the plasma sheet

Contact Info

Product

Resources

About