Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure

Zhang, XiangYun; Zong, Qiugang; Yang, Bojun; Wang, Yongfu

doi:10.1007/s11431-009-0270-6

Cited by 12 publications

(18 citation statements)

References 33 publications

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“…Solar wind dynamic pressure pulses that compress the magnetopause and launch fast mode waves can stimulate FLRs in the dayside magnetosphere around magnetic local noon . Numerical studies of ULF waves excited by solar wind impulses have confirmed coupling between global cavity modes and FLRs (Allan and Poulter 1992;Zhu et al 1991;Lee et al 1989;Zhang et al 2009). …”

Section: Introductionmentioning

confidence: 90%

“…The main difference between these two ULF wave generation mechanisms is that solar wind dynamic pressure pulses interact with the entire bow shock, while HFAs interact with the bow shock locally and move parallel to the bow shock. The MHD simulation and observational studies by Zhang et al (2009Zhang et al ( , 2010b have shown that ULF waves are generated inside the magnetosphere by negative solar wind dynamic pressure pulses. However, the possible ULF wave generation by HFAs has not been fully explored.…”

Section: Ulf Waves Driven By the Transient Foreshock Phenomenamentioning

confidence: 99%

“…Positive and negative impulses correlate with sudden changes in solar wind dynamic pressure that compress and inflate the magnetosphere, respectively (Zhang et al 2009. Solar wind density enhancements and sudden enhancements of solar wind speed are known to produce positive impulses.…”

Section: Introductionmentioning

confidence: 99%

“…IP shocks (positive impulses) are the primary cause of Storm Sudden Commencement (SSC) and enhancements of magnetopause currents. The interaction between Earth's magnetic field and positive impulses has been shown to excite ULF waves in the inner magnetosphere Zhang et al 2009;Zong et al 2009a, b). Positive impulses at the front edge of the Heliosphere Plasma Sheet (HPS) may also act as a source of ULF waves (Winterhalter et al 1994).…”

Section: Introductionmentioning

confidence: 99%

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The interaction of ultra-low-frequency pc3-5 waves with charged particles in Earth’s magnetosphere

Zong

Rankin

Zhou

2017

Rev. Mod. Plasma Phys.

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140

162

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One of the most important issues in space physics is to identify the dominant processes that transfer energy from the solar wind to energetic particle populations in Earth's inner magnetosphere. Ultra-low-frequency (ULF) waves are an important consideration as they propagate electromagnetic energy over vast distances with little dissipation and interact with charged particles via drift resonance and drift-bounce resonance. ULF waves also take part in magnetosphereionosphere coupling and thus play an essential role in regulating energy flow throughout the entire system. This review summarizes recent advances in the characterization of ULF Pc3-5 waves in different regions of the magnetosphere, including ion and electron acceleration associated with these waves.

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Section: Introductionmentioning

confidence: 90%

Section: Ulf Waves Driven By the Transient Foreshock Phenomenamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The interaction of ultra-low-frequency pc3-5 waves with charged particles in Earth’s magnetosphere

Zong

Rankin

Zhou

2017

Rev. Mod. Plasma Phys.

Self Cite

140

162

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“…The magnetopause current is intensified when a positive impulse impinges on the Earth's magnetosphere. Furthermore, ULF waves are excited in the inner magnetosphere as a result of the interaction between the Earth's magnetic field and positive solar wind pressure impulses/interplanetary shocks [28,53,54]. Although many of the positive impulses of solar wind dynamic pressure are associated with shocks, other types of positive impulses are found to exist, e.g.…”

Section: Ulf Waves Excited By Both Positive and Negative Solar Wind Dmentioning

confidence: 99%

Fast acceleration of “killer” electrons and energetic ions by interplanetary shock stimulated ULF waves in the inner magnetosphere

et al. 2011

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Energetic electrons and ions in the Van Allen radiation belt are the number one space weather threat. Understanding how these energetic particles are accelerated within the Van Allen radiation belt is one of the major challenges in space physics. This paper reviews the recent progress on the fast acceleration of "killer" electrons and energetic ions by ultralow frequency (ULF) waves stimulated by the interplanetary shock in the inner magnetosphere. Very low frequency (VLF) wave-particle interaction is considered to be one of the primary electron acceleration mechanisms because electron cyclotron resonances can easily occur in the VLF frequency range. Recently, using four Cluster spacecraft observations, we have found that, after interplanetary shocks impact the Earth's magnetosphere, energetic electrons in the radiation belt are accelerated almost immediately and continue to accelerate for a few hours. The time scale (a few days) for traditional acceleration mechanisms, based on VLF wave-particle interactions to accelerate electrons to relativistic energies, is too long to explain our observations. Furthermore, we have found that interplanetary shocks or solar wind pressure pulses, with even small dynamic pressure changes, can play a non-negligible role in radiation belt dynamics. Interplanetary shocks interaction with the Earth's magnetosphere manifests many fundamental space physics phenomena including energetic particle acceleration. The mechanism of fast acceleration of energetic electrons in the radiation belt responding to interplanetary shock impacts consists of three contributing parts: (1) the initial adiabatic acceleration due to strong shock-related magnetic field compression; (2) followed by the drift-resonant acceleration with poloidal ULF waves excited at different L-shells; and (3) particle acceleration due to the quickly damping electric fields associated with ULF waves. Particles end up with a net acceleration because they gain more energy in the first half of this cycle than they lose in the second. The results reported in this paper cast a new light on understanding the acceleration of energetic particles in the Earth's Van Allen radiation belt. The results of this study can likewise be applied to interplanetary shock interaction with other planets such as Mercury, Jupiter, Saturn, Uranus and Neptune, and other astrophysical objects with magnetic fields."killer" electrons, radiation belt, energetic particles acceleration, ULF wave, VLF wave, wave-particle interaction, resonance Citation:Zong Q G, Wang Y F, Yuan C J, et al. Fast acceleration of "killer" electrons and energetic ions by inter-planetary shock stimulated ULF waves in the inner magnetosphere.

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Dayside magnetospheric ULF wave frequency modulated by a solar wind dynamic pressure negative impulse

et al. 2017

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Ultralow frequency (ULF) waves play an important role in the transport of the solar wind energy to the magnetosphere. In this paper, we present a ULF wave event in the dayside magnetosphere which shows a sudden decrease in frequency from 3.1 to 2.3 mHz around 0756 UT on 11 January 2010, when a solar wind dynamic pressure drop (from ∼5 to ∼2 nPa) was observed simultaneously. The wave exits globally. The phase differences between electric and magnetic fields indicate that the compressional mode wave is standing before and after the wave frequency decrease. This result suggests that the ULF wave should be associated with a cavity mode and the frequency decrease might be induced by the change of the cavity size. A theoretical calculation was made to estimate the cavity mode frequency. The calculated wave frequency before/after the negative impulse is 3.8/2.6 mHz, which is consistent with the observations.

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Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure

Cited by 12 publications

References 33 publications

The interaction of ultra-low-frequency pc3-5 waves with charged particles in Earth’s magnetosphere

The interaction of ultra-low-frequency pc3-5 waves with charged particles in Earth’s magnetosphere

Fast acceleration of “killer” electrons and energetic ions by interplanetary shock stimulated ULF waves in the inner magnetosphere

Dayside magnetospheric ULF wave frequency modulated by a solar wind dynamic pressure negative impulse

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