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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dynamic geomagnetic rigidity cutoff variations during a solar proton event
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Dynamic geomagnetic rigidity cutoff variations during a solar proton event

机译：动态地磁刚性截止变化在一个太阳质子事件

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摘要

Solar proton events (SPE) are major, though infrequent, space weather phenomena that can produce hazardous effects in the near-Earth space environment. A detailed understanding of their effects depends upon knowledge of the dynamic rigidity cutoffs imposed by the changing total magnetic field. For the first time we investigate detailed comparisons between theoretical cutoff rigidities and ground-based measurements during the large geomagnetic disturbance of 4–10 November 2001. We make use of the imaging riometer (IRIS) at Halley, Antarctica, fortunately situated such that the rigidity cutoff sweeps back and forth across the instrument's field of view during the SPE period. The K p -dependent geomagnetic rigidity cutoff energies are determined from satellite observations combined with previously reported particle-tracing results. We find that the predicted absorption levels show good agreement with those experimentally observed for low and middle levels of geomagnetic disturbance (K p < 5). However, during more disturbed geomagnetic conditions the cutoff modeling overestimates the stretching of the geomagnetic field, underestimating the rigidity cutoff energies, and hence leading to riometer absorption predictions that are too high. In very disturbed conditions (K p ≈ 7–9) the rigidity energy cutoffs indicated by the IRIS observations appear to be equivalent to those predicted for K p ≈ 6 by the particle-tracing approach. Examples of changing rigidity cutoff contours for increasing levels of geomagnetic disturbance are presented.
机译：太阳质子事件(SPE)是主要的,虽然罕见,空间天气现象在近地空间产生有害影响环境。效果取决于知识的动态硬度达标强加的改变磁场。详细对比理论截止刚性和地面测量期间大地磁扰动电场2001年11月。宇宙噪声测量器(IRIS)哈雷,南极洲,幸运的是位于这样的刚性截止来回扫荡仪器的SPE期间的视野。K p端依赖地磁刚性截止从卫星能量决定观察与之前报道相结合粒子跟踪结果。预测吸收水平显示良好的协议为低,与实验观察到的中间层次的地磁扰动(K p <5)。然而,在地磁更不安截止建模高估了条件地磁场的拉伸,低估了刚性截止能量因此导致宇宙噪声测量器吸收的预测这太高了。(K p≈7 - 9)刚性能源被切断虹膜的观察似乎是等价的这些预测的K p≈6粒子跟踪的方法。刚性截止轮廓水平的增加地磁扰动。

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