Observations of Energetic Ions from Comet Giacobini-Zinner
Observations of Energetic Ions from Comet Giacobini-Zinner
复制标题
对贾科比尼-津纳彗星高能离子的观测
作者：
R. Hynds;S. Cowley;T. Sanderson;K. Wenzel;J. V. van Rooijen
在与Giacobini-Zinner彗星相遇期间，国际彗星探索者航天器上的高能粒子各向异性分光计观测到大量高能离子，据信主要是由于彗星大气电离，随后被太阳风的环境气流吸收和加速。这些重彗星离子在最接近前大约1天到之后大约2天被观测到。已经确定了三种不同离子特性的制度。一个尺度为1006公里的外部区域在未受干扰的太阳风中包含了反太阳流拾取离子的可变通量。在1005公里的中间区域，通量的大尺度变率较小，角分布和能量分布较宽。该区域通过急剧过渡与外部区域分离。内部区域的尺度为104公里，其特征是通量减少和复杂的角分布。
During the encounter with comet Giacobini-Zinner, the energetic particle anisotropy spectrometer on the International Cometary Explorer spacecraft observed large fluxes of energetic ions, believed to result principally from ionization of the cometary atmosphere followed by pickup and acceleration by the ambient flow of the solar wind. These heavy cometary ions were observed from approximately 1 day before closest approach to about 2� days afterward. Three regimes of differing ion characteristics have been identified. An outer region with a scale of ∼106 kilometers contains variable fluxes of antisolar-streaming pick-up ions in the undisturbed solar wind. In the middle region, of ∼105 kilometers, fluxes have less large-scale variability and broader angular and energy distributions. This region is separated from the outer zone by a sharp transition. The inner region has a scale of ∼104 kilometers and is characterized by reduced fluxes and complex angular distributions.