Dataset for "Generation and Impacts of Whistler-mode Waves during Energetic Electron Injections in Jupiter’s Outer Radiation Belt"

This is the dataset for.the paper "Generation and Impacts of Whistler-mode Waves during Energetic Electron Injections in Jupiter’s Outer Radiation Belt" submitted to Journal of Geophysical Research: Space Physics.Energetic particle injections are commonly observed in Jupiter’s magnetosphere and have important impacts on the radiation belts. We evaluate the roles of electron injections in the dynamics of whistler-mode waves and relativistic electrons using Juno measurements and wave-particle interaction modeling. The Juno spacecraft observed injected electron flux bursts at energies up to 300 keV at M shell ~11 near the magnetic equator during perijove-31. The electron injections are correlated with chorus wave bursts at 0.05-0.5 fce frequencies, where fce is the electron gyrofrequency. The electron pitch angle distributions are anisotropic, peaking near 90° pitch angle, and the fluxes are high during injections. We calculate the whistler-mode wave growth rates using the observed electron distributions and linear theory. The frequency spectrum of the wave growth rate is consistent with that of the observed chorus magnetic intensity, suggesting that the observed electron injections provide free energy to generate whistler-mode chorus waves. We further use quasilinear theory to model the impacts of chorus waves on 0.1-10 MeV electrons. Our modeling shows that the chorus waves could cause the pitch angle scattering loss of electrons at <1 MeV energies and accelerate relativistic electrons at multiple MeV energies in Jupiter’s outer radiation belt. The electron injections also provide an important seed population at several hundred keV energies to support the acceleration to higher energies. Our wave-particle interaction modeling demonstrates the energy flow from the electron injections to the relativistic electron population through the medium of whistler-mode waves in Jupiter's outer radiation belt.

本数据集对应投稿于《地球物理研究杂志：空间物理学》的论文《木星外辐射带高能电子注入期间哨声模波（whistler-mode waves）的产生与影响》。高能粒子注入是木星磁层中常见的观测现象，对辐射带具有重要影响。本研究利用朱诺号（Juno）观测数据与波粒相互作用模拟，评估了电子注入在哨声模波动力学与相对论电子演化过程中的作用。在第31次近木点期间，朱诺号航天器在磁赤道附近M壳层~11处观测到能量最高达300 keV的注入电子通量爆发。该电子注入事件与0.05~0.5倍电子回旋频率（electron gyrofrequency, fce）频段内的合声波爆发存在相关性。电子投掷角分布呈现各向异性，在90°投掷角附近达到峰值，且注入期间电子通量处于较高水平。本研究基于观测到的电子分布与线性理论，计算了哨声模波的增长率。波增长率的频谱与观测到的合声波磁场强度频谱一致，表明观测到的电子注入为哨声模合声波的产生提供了自由能。本研究进一步利用准线性理论，模拟了合声波对0.1~10 MeV相对论电子的影响。模拟结果显示，在木星外辐射带中，合声波可导致能量低于1 MeV的电子发生投掷角散射损失，并对多MeV能量的相对论电子产生加速作用。电子注入同时为数百keV能量段提供了重要的种子粒子群体，支撑了电子向更高能量的加速过程。本波粒相互作用模拟证实了在木星外辐射带中，能量通过哨声模波作为媒介，从电子注入群体传递至相对论电子群体。