The interaction between ULF waves and thermal plasma ions at the plasmaspheric boundary layer during substorm activity


During a substorm on 27 January 2004, energetic particle injections associated with ULF waves have been detected by Cluster satellites. The observed ULF waves with the period of 1 minutes are probably the third harmonic mode, which can simultaneously interact with both substorm injected "hot" particles from the magnetotail and cold outflow ions from the Earth's ionosphere.

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Energetic electron response to interplanetary shocks at geosynchronous orbit


We study the response of energetic electrons at geosynchronous orbit to interplanetary shocks, to show the increase of low-energy electron fluxes after the shock arrival. However, in higher energy channels fluxes show smaller increases and eventually become unchanged or even decrease. Statistical analysis also reveals a frequency preference for 2.2 mHz and 3.3 mHz oscillations of energetic electron fluxes, with different phase and power distributions for high- and low-energy electron fluxes.

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Evidence of Landau and cyclotron resonance between protons and kinetic waves


They are two closely connected science questions about how the solar wind is heated and how the turbulence is dissipated. The research breakthrough is blocked by the difficulty of combining the wave diagnosis and particle kinetics analysis together. We provided the simultaneous information of wave features and particle kinetics. We confirmed again the two components of waves at ion kinetic scales, quasi-parallel ion cyclotron waves and quasi-perpendicular kinetic Alfven waves. We identified the evidence of multiple resonance plateaus: left-cyclotron resonance between ion cyclotron waves and proton core components, right-cyclotron resonance and Landau resonance between kinetic Alfven waves and proton beam components. Hence, a scenario of solar wind proton joint heating perpendicularly and parallely by the two-component kinetic waves is suggested.

This work is published on Astrophys. J. Lett. (ApJL)上 (He, J.-S., et al., ApJL, 800, L31, 2015)。
Authors: Jiansen HE, Linghua WANG, Chuanyi TU, Eckart MARSCH, Qiugang ZONG

This work is supported by NSFC innovation group program, key program, excellent scholarship program, and general program.

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