论文标题
Parker太阳能探测的观测值接近$ f _ {\ rm ce} $谐波排放近太阳风及其对磁场方向的依赖
Parker Solar Probe observations of near-$f_{\rm ce}$ harmonics emissions in the near-Sun solar wind and their dependence on the magnetic field direction
论文作者
论文摘要
在电子频频谐波附近的频率下的波发射在低于40个太阳半径以下的小型中心距离处观察到，并且已知发生在具有静态磁场的区域中。我们显示了这些波与磁场的大规模特性的密切联系。仅当环境磁场向相应的$ 80^{\ circ} \simsimsimθ_b\ simersim simsim 100^{\ circim和$ 10^{\ circim distems the Ambient磁场指向环境磁场的方向范围狭窄的方向范围狭窄的方向范围狭窄时，就会发生近电频频谐波排放。 30^{\ circ} $。我们表明，当两个角度都接近有利于波排放的角度间隔的中心时，波排放的幅度最高。波排放的强度与大小时尺度的磁场角变化相关。波排放间隔与宽带磁波振幅下降的间隔相关，低频为10Hz-100Hz。我们讨论波浪的可能产生机制。
Wave emissions at frequencies near electron gyrofrequency harmonics are observed at small heliocentric distances below about 40 solar radii and are known to occur in regions with quiescent magnetic fields. We show the close connection of these waves with the large-scale properties of the magnetic field. Near electron gyrofrequency harmonics emissions occur only when the ambient magnetic field points to a narrow range of directions bounded by polar and azimuthal angular ranges in the RTN coordinate system of correspondingly $80^{\circ} \lesssim θ_B \lesssim 100^{\circ}$ and $10^{\circ} \lesssim ϕ_B \lesssim 30^{\circ}$. We show that the amplitudes of wave emissions are highest when both angles are close to the center of their respective angular interval favorable to wave emissions. The intensity of wave emissions correlates with the magnetic field angular changes at both large and small time scales. Wave emissions intervals correlate with intervals of decreases in the amplitudes of broadband magnetic fluctuations at low frequencies of 10Hz-100Hz. We discuss possible generation mechanisms of the waves.
