论文标题
窄带大幅度惠斯勒模式波及其与电子的关联：立体波形捕获观测值
Narrowband large amplitude whistler-mode waves in the solar wind and their association with electrons: STEREO waveform capture observations
论文作者
论文摘要
在太阳风中经常观察到频率为0.2至0.4倍的频率的振幅惠斯勒波。波浪正倾斜地传播靠近共振锥，具有与背景磁场平行的显着电场，从而使其与电子相互作用。传播角度与通常在太阳风中观察到的吹口哨明显不同，幅度明显更大。波浪最常与流相互作用区域（SIR）相关，并且通常被关闭。在54位SIRS中，有68％的惠斯勒群体狭窄。在九个行星际冠状质量驱散中，有33％具有相干的组。尽管波动的发生是电子温度各向异性和平行β的函数，但受惠斯勒温度各向异性和火霍斯不稳定性的阈值的约束，但两者都与观察到的波浪性质一致。我们首次表明，将波数据与电子束驱动不稳定性的阈值进行比较（梁速度大于电子as alfven速度的两倍），并与惠斯勒热通量风扇不稳定性进行了比较，表明要么可能使窄带波稳定。相比之下，平均而言，较不连贯的波与零或接近零热通量和更高的电子alfven速度相关，而没有更高的能梁。这表明，较小的连贯性波在调节电子热通量方面可能更有效，或者通过窄带波对太阳风电子的散射和通电导致波的拓宽。高度倾斜的繁殖和窄带和较不连贯的扬口的大幅度使与电子在广泛的能量范围内与电子的谐振相互作用，并且与平行的吹口哨不同，不需要电子和波浪反向物质。
Large amplitude whistler waves at frequencies of 0.2 to 0.4 times electron cyclotron frequency are frequently observed in the solar wind. The waves are obliquely propagating close to the resonance cone, with significant electric fields parallel to the background magnetic field, enabling strong interactions with electrons. Propagation angles are distinctly different from whistlers usually observed in the solar wind, and amplitudes are significantly larger. Waves occur most often in association with stream interaction regions (SIRs), and are often close-packed. 68 percent of the 54 SIRs had narrowband whistler groups; 33 percent of the nine interplanetary coronal mass ejections had coherent groups. Although wave occurrence as a function of the electron temperature anisotropy and parallel beta is constrained by the thresholds for the whistler temperature anisotropy and firehose instabilities, neither is consistent with observed wave properties. We show for the first time that comparisons of wave data to thresholds for the electron beam driven instability (beam speed greater than twice the electron Alfven speed) and to the whistler heat flux fan instability indicate that either might destabilize the narrowband waves. In contrast, the less coherent waves, on average, are associated with zero or near zero heat flux and much higher electron Alfven speeds, without higher energy beams. This suggests that the less coherent waves may be more effective in regulating the electron heat flux, or that the scattering and energization of solar wind electrons by the narrowband waves results in broadening of the waves. The highly oblique propagation and large amplitudes of both the narrowband and less coherent whistlers enable resonant interactions with electrons over a broad energy range, and, unlike parallel whistlers does not require that the electrons and waves counter-propagate.
