论文标题
地磁逆转期间的大气电离速率
Atmospheric ionization rates during a geomagnetic reversal
论文作者
论文摘要
地球磁性偶极子场的Matuyama-brunhes逆转发生在0.78 MA前，并且在此期间可用详细的时间分辨的古磁数据。地磁逆转有望影响宇宙射线通量，进而可能影响大气电离速率。在这项研究中，提出了基于输入磁场的整个地球的大气电离的模型。以时间依赖性的古磁数据为输入，产生了逆转过程中大气电离速率的3D时间序列。我们表明，随着偶极场削弱，大气电离在低纬度下增加。增长是CA。在上层大气中，表面为25％，最高为5。在全球范围内，在地表上的电离率在上层大气中增加了约13％，高达2倍，而极性区域则在很大程度上不受影响。最后，由于太阳能11年周期而导致的电离变化受到逆转的极大影响。太阳最低和太阳量最大之间的大气电离之间的相对变化在2至两个数量级之间变化。所有大气电离数据均可下载。
The Matuyama-Brunhes reversal of Earth's magnetic dipole field took place 0.78 Ma ago, and detailed temporally resolved paleomagnetic data are available for this period. A geomagnetic reversal is expected to impact the cosmic ray flux, which in turn might impact atmospheric ionization rates. In this study a model that yields atmospheric ionization for the entire globe based on an input magnetic field is presented. Taking the time dependent paleomagnetic data as input, a 3D time series of the atmospheric ionization rates during the reversal is produced. We show, that as the dipole field weakens, the atmospheric ionization increases at low latitudes. The increase is ca. 25% at the surface and up to a factor of 5 in the upper atmosphere. Globally, ionization rates increase around 13% at the surface and up to a factor of 2 in the upper atmosphere, whereas polar regions are largely unaffected. Finally, the change in ionization due to the solar 11-year cycle is greatly affected by the reversal. The relative change in atmospheric ionization between solar-minimum and solar-maximum varies between 2 and two orders of magnitude. All atmospheric ionization data is made available for download.
