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Statistical analysis of ionospheric total electron content (TEC): long-term estimation of extreme TEC in Japan
Earth, Planets and Space ( IF 3.362 ) Pub Date : 2021-02-15 , DOI: 10.1186/s40623-021-01374-8
Michi Nishioka , Susumu Saito , Chihiro Tao , Daikou Shiota , Takuya Tsugawa , Mamoru Ishii

Ionospheric total electron content (TEC) is one of the key parameters for users of radio-based systems, such as the Global Navigation Satellite System, high-frequency communication systems, and space-based remote sensing systems, since total ionospheric delay is proportional to TEC through the propagation path. It is important to know extreme TEC values in readiness for hazardous ionospheric conditions. The purpose of this study is to estimate extreme TEC values with occurrences of once per year, 10 years, and hundred years in Japan. In order to estimate the extreme values of TEC, a cumulative distribution function of daily TEC is derived using 22 years of TEC data from 1997 to 2018. The extreme values corresponding to once per year and 10 years are 90 and 110 TECU, respectively, in Tokyo, Japan. On the other hand, the 22-year data set is not sufficient to estimate the once-per-100-year value. Thus, we use the 62-year data set of manually scaled ionosonde data for the critical frequency of the F-layer (foF2) at Kokubunji in Tokyo. First, we study the relationship between TEC and foF2 for 22 years and investigate the slab thickness. Then the result is applied to the statistical distribution of foF2 data for 62 years. In this study, two methods are applied to estimate the extreme TEC value. In the first method, the distribution of slab thickness is artificially inflated to estimate extreme TEC values. In the second method, extreme slab thicknesses are applied to estimate extreme TEC values. The result shows that the once-per-100-year TEC is about 150–190 TECU at Tokyo. The value is also estimated to be 180–230 TECU in Kagoshima and 120–150 TECU in Hokkaido, in the southern and northern parts of Japan, respectively.



中文翻译:

电离层总电子含量(TEC)的统计分析:日本极端TEC的长期估算

电离层总电子含量(TEC)是基于无线电的系统(例如全球导航卫星系统,高频通信系统和天基遥感系统)用户的关键参数之一,因为总电离层延迟与TEC通过传播路径。重要的是要知道准备就绪以应对危险的电离层条件。这项研究的目的是估计在日本每年,10年和100年发生一次的极端TEC值。为了估计TEC的极值,使用从1997年到2018年的22年TEC数据得出了每日TEC的累积分布函数。分别对应于每年一次和10年的极值分别为90和110 TECU。日本东京。另一方面,22年的数据集不足以估计每100年一次的值。因此,对于东京国分寺的F层(foF2)的临界频率,我们使用了62年的手动缩放的离子探空仪数据集。首先,我们研究了TEC和foF2之间的关系长达22年,并研究了板坯厚度。然后将结果应用于foF2数据的统计分布62年。在这项研究中,应用了两种方法来估计极端TEC值。在第一种方法中,人为地增加了板坯厚度的分布以估算极端TEC值。在第二种方法中,应用极端板坯厚度来估算极端TEC值。结果表明,东京每100年一次的TEC约为150-190 TECU。估计值在鹿儿岛为180-230 TECU,在北海道为120-150 TECU,

更新日期:2021-02-16
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