Author:
Chu Wei,Yang Yanyan,Xu Song,Qin Gang,Huang Jianping,Zeren Zhima,Shen Xuhui
Abstract
As a parameter that quantitatively measures the shielding effect of the Earth’s magnetic field on energetic particles, the geomagnetic cutoff rigidities will change significantly with the long-term change of geomagnetic field. In this article, by using the numerical simulation method, combined with the variation trend of the Earth’s main field International Geomagnetic Reference Field (IGRF) model and the energetic particles’ windows (EPWs), the variation characteristics of the cutoff rigidities of geomagnetic energetic particles in the vertical direction from 1965 to 2025 were studied. The study found that there is a close relationship between the cutoff latitude corresponding to the cutoff rigidities and the background magnetic field intensity, but they are not in a simple linear relationship. The changes of the cutoff rigidities and geomagnetic field in the northern and southern hemispheres are asymmetric. The weakening of the geomagnetic field will push the cutoff latitudes toward the near equatorial region in the southern hemisphere, but for northern hemisphere the phenomenon is not always credible. In the northern hemisphere, the areas of EPWs will decrease at a relative rate of 0.03%/yr, but in the southern hemisphere, it will increase at a rate of about 0.05%/yr to 0.12%/yr. The long-term trajectory of the positions of the EPWs’ central points do not correspond to geomagnetic poles, nor the magnetic dip poles, relatively speaking, its position is closer to the geomagnetic poles. The study can be used for a long-term forecasting of cutoff rigidities caused by background geomagnetic field variations.
Subject
General Earth and Planetary Sciences
Reference31 articles.
1. International Geomagnetic Reference Field: the Thirteenth Generation;Alken;Earth Planets and Space,2020
2. The Occurrence of Operational Anomalies in Spacecraft and Their Relationship to Space Weather;Baker;IEEE Trans. Plasma Sci.,2000
3. Changes in Cosmic ray Cut-Off Rigidities Due to Secular Variations of the Geomagnetic Field;Bhattacharyya;Ann. Geophys.,1997
4. A Study on Non-vertical Geomagnetic Cutoff Rigidity of Magnetosphere Energetic Particles during Geomagnetic Quiet Period;Chu;Chin. J. Geophys.,2021
5. The Geomagnetic Cutoff Rigidities at High Latitudes for Different Solar Wind and Geomagnetic Conditions;Chu;Ann. Geophys.,2016
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献