Recent progress in understanding Pc1 pearl formation

Демехов, А. Г.

doi:10.1016/j.jastp.2007.01.014

Cited by 46 publications

(35 citation statements)

References 46 publications

(64 reference statements)

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“…It is not clear whether the ULF waves simply modulate the precipitation or whether they play a critical role in causing the scattering. ULF waves could be modulating the growth rate of waves, which has been proposed to explain Pc1 pearls through several mechanisms (e.g., Demekhov 2007). Alternatively, if EMIC waves are the cause of the precipitation, modulation of the background magnetic field would lead to a modulation of the minimum resonance energy.…”

Section: Large-scale Spatial Structure Of Relativistic Precipitationmentioning

confidence: 99%

The Balloon Array for RBSP Relativistic Electron Losses (BARREL)

et al. 2013

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Section: Large-scale Spatial Structure Of Relativistic Precipitationmentioning

confidence: 99%

The Balloon Array for RBSP Relativistic Electron Losses (BARREL)

et al. 2013

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“…The larger growth rate could result from the modulation of plasma density and/or magnetic field by compressional waves in the low-frequency part of the ULF wave band [e.g., Mursula et al, 2001;Mursula, 2007]. In order to "work", this mechanism requires high intensity of the low-frequency compressional waves, about tens of nT or so [e.g., Demekhov, 2007]. However, EMIC waves are observed when the amplitudes of simultaneous compressional Pc5 are small.…”

Section: Quasi-field-aligned Emic Waves and Nonlinear Source Of Seed mentioning

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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“…3) stopped the Pc1 emission generation near 06 UT. The scenario of the development of the process leading to the generation of the observed emission associated with the dynamics of the plasmapause during the recovery phase of a strong magnetic storm and nonlinear processes is proposed.The nature of the second Pc1 event could be explained by applying the generally accepted model of the resonant interaction of the electromagnetic ion cyclotron (EMIC) waves with hot anisotropic protons in the Earth's magnetosphere [see, for example, Kangas et al, 1998;Demekhov, 2007]. The maximum amplification of the EMIC waves occurs at the frequency Yakimenko, 1971, Gendrin et al, 1971]:…”

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confidence: 99%

“…Streams formation mechanisms of relativistic and ultra-relativistic particles are one of the actual tasks of space plasma physics. One effective mechanism of generation of ultra-relativistic particles flow is the surfatron acceleration of charged particles by electromagnetic waves, described earlier in [Bulanov and Sakharov, 1986, Chernikov, et al, 1992, Dieckmann and Shukla, 2006, Erokhin, et al, 1987, 2007, Gribov, et al, 1985, Itin, et al, 2000, Joshi, 1984Katsouleas and Dawson, 1983;Kichigin, 1995;2001, Loznikov and Erokhin, 2010, Neishtadt, et al, 2009, Sitnov, 1988, Takeuchi et al, 1987, Vasiliev et al, 2012. An efficiency of the surfatron acceleration of electrons with low relativistic initial energy in the presence of a weak constant magnetic field is analyzed.…”

mentioning

confidence: 99%

“…Nonlinear effects from the interaction of the accelerating wave with the plasma are insignificant, if the wave amplitude E 0 is significantly lower than the field of relativistic nonlinearity, i.e. on the condition σ 2 << 1 [Erokhin, et al, 1987, 2007, Shkevov, et al, 2013.Let us consider the relativistic equations of motion of electrons with mass m e in the field of an electromagnetic wave E x = E 0 cos Ψ, Ψ = ωt -kx. It is supposed that β β β β = v/c, τ = ωt dimensionless time, ξ = ωx /c.…”

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Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

Danov¹,

Georgieva²,

Kirov³

2018

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IIn ns st tr ru um me en nt ta at ti io on n f fo or r S Sp pa ac ce e W We ea at th he er r D Da at ta a P Pr ro oc ce es ss si in ng g a an nd d M Mo on ni it to or ri in ng g Sadovnichii V.A., Panasyuk M.I., Lipunov V.M., Bogomolov A.V., Bogomolov V.V. et.al. Monitoring of space radiation and other hazards in multi-satellite project `Universat-SOCRAT 123 S. Yerin, A. Stanislavsky, I. Bubnov, A. Konovalenko, P. Tokarsky, V. Zakharenko Small-sized radio telescopes for monitoring and studies of solar radio emission at meter and decameter wavelengths 129 M.M. Kalinichenko, O.O. Konovalenko, A.I. Brazhenko, N.V Šterc, D. Roša, D. Maričić, D. Hržina, I. Romštajn, A. Chilingarian, T. Karapetyan, D. Cafuta, M. Horvat Abstract.A powerful series of solar flares is occurred in the minimum of solar activity 2017 September 4 -11 over the active region AR12673. This active region produces two large and many small flares. The flare X8.2 is followed by solar cosmic rays. The active region at that time is situated on the back side of the Sun disk behind the Western limb. The front of the accelerated protons flux arrives to the Earth with the delay not exceeding the proton flight time from the Sun. Such proton propagation can occur only along the lines of the interplanetary magnetic field. There is no reason to believe that the mechanisms of cosmic ray acceleration on the Sun and other stars are of different nature. The flux of relativistic electrons does not show any connection with the solar cosmic rays. The results of SDO spacecraft are used to study the pre-flare state and flare development. The source of flare radiation in the spectral lines of the highly ionized irons FeXXIV and FeXXIII is observed in the corona. The emission of these spectral lines sharp increases during flare X-ray radiation appearing. The energy release of a flare occurs in the corona above an active region. The temperature in the flare is greater than 20 MK. The size of the hot plasma cloud is ~10 10 cm. IntroductionThe solar constant indicates an amazing stability of the solar thermonuclear reactor. The solar constant is 1367 W/m 2 . The change of the solar constant during the 11-year cycle of solar activity does not exceed ~10 -3 . Against the backdrop of this amazing stability of the Sun's work the big solar flares are observed several times per a year. The flare energy release takes place in the corona over a complex active region with a magnetic flux greater than 10 22Mx. The energy of a solar flare can exceed 10 32 erg. The flare duration is from 10 to 100 minutes. The flare is a manifestation of a number of physical processes, including X-ray radiation, the ejection of the corona substance and proton acceleration to the relativistic energy of not less than 20 GeV [Balabin et al., 2005; Podgorny and Podgorny, 2016].The Sun is the only astronomical object that generates proton pulses with the relativistic energy. The solar proton acceleration takes place along a singular line of the current sheet above an active region. The electric ...

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Recent progress in understanding Pc1 pearl formation

Cited by 46 publications

References 46 publications

The Balloon Array for RBSP Relativistic Electron Losses (BARREL)

The Balloon Array for RBSP Relativistic Electron Losses (BARREL)

Model of electromagnetic ion cyclotron waves in the inner magnetosphere

Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

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