Geomagnetic Pulsations and Diagnostics of the Magnetosphere

Troitskaya, V.A.; Gulelmi, A. V.

doi:10.1070/pu1969v012n02abeh003933

Cited by 38 publications

(15 citation statements)

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“…Using the data of dispersion of Pcl pulsations and, in some cases lpdp as well, we may estimate the plasma density in the region of generation and the energy of the resonance particles. The corresponding methods and results of the diagnostics are well known (see [1][2][3][4][5][6][7][8][9]). We shall discuss some new possibilities arising when considering nonstationary spectrum of hydromagnetic emissions.…”

Section: Nonstationary Processesmentioning

confidence: 99%

“…The exitation of Pi2, however, take place in extremely non-stationary regime: the peak velocity of the energy income excedes the rate of dissipation, and the energy balance is only accomplished in average by a long time period. Table II shows typical energetic parametres of pulsations [9]. For comparison the corresponding parameters for magnetic storms are shown.…”

Section: The Energy Of Pulsationsmentioning

confidence: 99%

“…While moving along the force line the particle will remain trapped, till the deviation from resonance t Vii (l)K(l)-f2(t)] exceeds the frequency of oscillations (5. From this condition we find the value Al with the accuracy of coefficient of unit order by expanding ~ (l), VII (1) and K (t) into series by powers l in the neighbourhood of the force line top o5 Equating now the pass time tHAI/VII to the relaxation time of the increment tr~ 1/o5, we obtain the value of the wave amplitude [9]…”

Section: The Energy Of Pulsationsmentioning

confidence: 99%

“…In recent years the methods and results of the hydromagnetic diagnostics of the near Earth plasma have been widely discussed in literature and on International Conferences (see, for example, surveys of Troitskaya and Gul'elmi [1][2][3][4], Gendrin [5], Saito [6], Anbry [7], monographs of Jacobs [8] and Gul'elmi and Troitskaya [9]). In the presented report, therefore I am not giving a detailed presentation of wellknown results.…”

Section: Introductionmentioning

confidence: 99%

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Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Gulelmi¹

1974

Space Sci Rev

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The possibility of diagnostics of the interplanetary magnetic field using the data of ground observations of Pc3, 4 pulsations is investigated. Both empirical and theoretical foundations of this method are discussed. In the shorter-period range (Pcl, Pil, Ipdp) the methods of qualitative diagnostics of non-stationary processes in the quiet and disturbed magnetosphere are considered. In conclusion, we shall briefly consider the problems, arising when estimating the amplitude of the hydromagnetic waves in the regions of generation.

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Section: Nonstationary Processesmentioning

confidence: 99%

Section: The Energy Of Pulsationsmentioning

confidence: 99%

Section: The Energy Of Pulsationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Gulelmi¹

1974

Space Sci Rev

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“…Also, the presence of system. [15][16][17][18] The compositional analyses of the nitride precipitates by APFIM and 3DAPM, presented subsequently, darkly imaging planes between the bright ones can be excluded by controlled evaporation sequences, carefully layclearly reveal the precipitates to be molybdenum-nitride based with only a small Fe content. Hence, the possible ing bare atomic plane by atomic plane.…”

Section: Introductionmentioning

confidence: 99%

Subnanometer-scale chemistry and structure of α-iron/molybdenum nitride heterophase interfaces

Isheim

Seidman

2002

Metall Mater Trans A

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The local chemistry and structure of ␣-iron/molybdenum nitride heterophase interfaces is studied on a subnanometer scale by atom-probe field-ion microscopy (APFIM), three-dimensional atom-probe microscopy (3DAPM) and both conventional transmission electron microscopy (CTEM) and highresolution electron microscopy (HREM). Molybdenum nitride precipitates are generated by annealing Fe-2 at. pct Mo-X, where X ϭ 0.4 at. pct Sb or 0.5 at. pct Sn, at 550 ЊC or 600 ЊC, in an ammonia/ hydrogen mixture. Internal nitridation at 550 ЊC produces thin, coherent platelet-shaped molybdenum nitride precipitates. Nitridation at 600 ЊC generates a much coarser structure with semicoherent thick plate-shaped and spheroidal precipitates in addition to the thin-platelet structure. The APFIM and 3DAPM analyses of the heterophase interfaces show substantial segregation of the solute species Sn and Sb only at the coarse precipitates, with Gibbsian interfacial excesses of up to 7 Ϯ 3 nm Ϫ2 , whereas the broad faces of the thin platelets have no detectable segregation. The TEM and HREM analyses show that the coarse precipitates are semicoherent, whereas the thin platelets are either coherent or have much fewer misfit dislocations than geometrically necessary. This demonstrates that Sn and Sb segregation is related to the presence of misfit dislocations at the interfaces of the coarse precipitates.

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