Dataset for 'Analysis of Electron Precipitation and Ionospheric Density Enhancements due to Hiss Using Incoherent Scatter Radar and Arase Observations'

This is the dataset for the paper 'Analysis of Electron Precipitation and Ionospheric Density Enhancements due to Hiss Using Incoherent Scatter Radar and Arase Observations', submitted to Journal of Geophysical Research: Space Physics.<br>Plasmaspheric hiss could cause energetic electron precipitation from the magnetosphere to the Earth’s upper atmosphere and affect the ionospheric electron density profiles. In this study, we use Arase satellite measurements in the dayside plasmasphere to model the electron precipitation and the ionospheric electron density enhancements, and compare the results to the electron density measured by Poker Flat Incoherent Scatter Radar (PFISR). We analyzed two close conjunction events between Arase and PFISR at L ~ 6 over the afternoon sector, when Arase was in the outer plasmasphere and travelled into the plasmaspheric plumes, respectively. Modest or strong hiss waves were observed with amplitudes higher than 50 pT during both events. Quasilinear modeling suggests that the hiss waves could cause intense electron precipitation from several keV to several hundred keV energies. The electron density profiles at 60 – 90 km modeled by Boulder Electron Radiation to Ionization (BERI) suggest significant electron density enhancements due to the precipitating electrons. The PFISR also observed electron density enhancements during both events, and provided evidence for the electron precipitation at low altitudes down to &lt; 70 km. The temporal modulation of hiss caused the modulated density profiles in BERI modeling, which is not evident in PFISR observations. The modeled altitude profiles of electron density overall agree with PFISR observation. At altitudes below 75 km, the modeled electron densities are lower than the observation, suggesting additional high energy electron precipitation possibly due to low frequency (&lt; 50 Hz) waves or hiss wave powers ducted to high latitudes.<br>

本数据集对应投稿于《地球物理研究杂志：空间物理（Journal of Geophysical Research: Space Physics）》的论文《利用非相干散射雷达与Arase卫星观测研究嘶声引发的电子沉降与电离层密度增强（Analysis of Electron Precipitation and Ionospheric Density Enhancements due to Hiss Using Incoherent Scatter Radar and Arase Observations）》。
等离子体层嘶声（Plasmaspheric hiss）可引发磁层内高能电子向地球高层大气沉降，并对电离层电子密度分布产生影响。本研究利用日间等离子体层区域的Arase卫星观测数据，构建电子沉降与电离层电子密度增强模型，并将模拟结果与扑克平地非相干散射雷达（Poker Flat Incoherent Scatter Radar, PFISR）测得的电子密度数据进行对比。我们分析了两个L≈6的午后扇区Arase卫星与PFISR的近重合事件，期间Arase分别处于外等离子体层并进入等离子体层羽流区域。两次事件中均观测到幅度高于50皮特斯拉（pT）的中等强度或强嘶声波动。准线性模拟结果表明，该嘶声波动可引发数keV至数百keV能量范围内的强电子沉降。由博尔德电子辐射电离模型（Boulder Electron Radiation to Ionization, BERI）模拟得到的60~90 km高度区间的电子密度分布显示，沉降电子引发了显著的电离层电子密度增强。两次事件中PFISR均观测到电子密度增强现象，并为低至<70 km高度的电子沉降提供了观测证据。嘶声波动的时间调制使得BERI模拟中出现了调制的密度分布特征，但该特征在PFISR观测数据中并不明显。整体而言，模拟得到的电子密度高度分布与PFISR观测结果吻合较好。在75 km以下高度，模拟得到的电子密度低于观测值，这表明可能存在额外的高能电子沉降，其成因可能为低频（<50 Hz）波动或是传导至高纬度的嘶声波动能量。