2004-2010年在地球附近、旅行者2号和旅行者1号的日鞘中测量的150-250 MeV Cosmic Ray质子强度的恢复- A两区日圈
Recovery of 150-250 MeV Cosmic Ray Proton Intensities Between 2004-2010 as Measured Near the Earth, at Voyager 2 and also in the Heliosheath at Voyager 1 - A Two Zone Heliosphere
摘要：
在2004年至2010年的第23个太阳活动周期中，利用IMP、ACE和气球数据，在地球上跟踪了能量约为150-250 MeV/nuc的宇宙射线质子的恢复，还在74-92 AU之间的V2和日光层终止激波之外的V1（91-113 AU）跟踪了宇宙射线质子的恢复。在这段时间内，地球和V1的强度之间的相关系数为0.936，由于太阳风从地球传播到外日球层的传播时间，允许约0.9年的延迟。为了描述这些强度的变化，并预测在所有三个位置测量的绝对强度，我们使用了一个简单的球对称（无漂移）两区日光层传输模型与特定值的扩散系数在内部和外部区域。外区的扩散系数约为90 ~ 120（130）AU，比内区的扩散系数小约5-10倍，最大可达90 AU。这意味着，在这个模型中，外部区域的作用很像扩散屏障。在2004-2010年期间，V1和地球上的强度和强度变化的绝对星等被描述为在百分之几以内的扩散系数，该系数随时间变化，在内部区域为~4倍，在外部区域仅为~1.8（1.25）倍。这些扩散系数和它们的变化基本上是相同的那些来自早期的类似研究，使用相同的能量的He核。该模型和所使用的扩散系数提供了2009年地球~250 MV的总调制潜力。在V2处的计算强度和观测强度之间的差异约为10-20%，可以解释为如果日光层在距离上被压缩了约10%（非球形），使得HTS在V2方向上比V1方向更接近太阳。
英文摘要：
The recovery of cosmic ray protons of energy ~150-250 MeV/nuc in solar cycle #23 from 2004 to 2010 has been followed at the Earth using IMP, ACE and balloon data and also at V2 between 74-92 AU and at V1 beyond the heliospheric termination shock (91-113 AU). The correlation coefficient between the intensities the Earth and V1 during this time period, is 0.936, allowing for a ~0.9 year delay due to the solar wind propagation time from the Earth to the outer heliosphere. To describe these intensity changes and to predict the absolute intensities measured at all three locations we have used a simple spherically symmetric (no drift) two-zone heliospheric transport model with specific values for the diffusion coefficient in both the inner and outer zones. The diffusion coefficient in the outer zone, from about 90 to 120 (130) AU, is determined to be ~5-10 times smaller than that in the inner zone out to 90 AU. This means that the outer zone acts much like a diffusing barrier in this model. The absolute magnitude of the intensities and the intensity changes at V1 and the Earth are described to within a few percent by a diffusion coefficient that varies with time by a factor ~4 in the inner zone and only ~1.8 (1.25) in the outer zone over the time period from 2004-2010. These diffusion coefficients and their variations are essentially the same as those derived earlier from a similar study using He nuclei of the same energy. This model and the diffusion coefficients used provide a total modulation potential at the Earth ~250 MV in 2009. The difference ~10-20% between calculated and observed intensities at V2 can be explained if the heliosphere is squashed by ~10% in distance (non-spherical) so that the HTS is closer to the Sun in the direction of V2 compared to V1.
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