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应用IGRF2000模式与IGRFl970模式计算了低高度南大西洋负磁异常区30年的变化。计算结果表明,从1970年到2000年,低高度南大西洋负磁异常区中心位置在经度方向向西漂移了4°~6°左右,纬度方向向北最大漂移不超过1°。同一高度上,2000年南大西洋负磁异常区的范围比1970年的范围大,且包含1970年的异常区,磁场强度的最小值也有一定程度的减弱。本文还简要讨论了磁场环境的变化对低高度辐射带粒子环境的影响。
By using IGRF2000 and IGRF1970 models, the variation of negative anomalies over the South Atlantic over a 30-year period has been calculated. The results show that from 1970 to 2000, the center of the negative anomaly in the low altitude of the South Atlantic drifts westwards by 4 ° ~ 6 ° in the longitude direction and the maximum north drift in the latitudinal direction does not exceed 1 °. At the same altitude, the range of the negative anomalous area of the South Atlantic in 2000 is larger than that of 1970, and contains the anomalous area in 1970, and the minimum of magnetic field intensity is also weakened to some extent. This article also briefly discussed the impact of changes in the magnetic field environment on the particle environment of the low-altitude radiation zone.