Role of asymmetric ring current in forbush decrease profiles during geomagnetic storms

Greg Hilbert

doi:10.1016/j.asr.2026.09.042

2026-09-23

PRE

DOI：10.1016/j.asr.2026.09.042

原文链接

摘要

En 中文

福布斯下降（FDs）和地磁暴（GSs）是主要的空间天气扰动，通常由行星际日冕物质抛射（ICMEs）驱动。本研究探讨了ICME驱动地磁暴期间宇宙射线（CRs）的调制。我们观察到CR通量中存在明显的刚度依赖各向异性，并进一步将其与环电流不对称分量指标Asym-H指数相关联进行分析。结果表明，不对称环电流在塑造FD剖面中起着重要作用。我们提出，暴时不对称性导致截止刚度的经向变化，进而改变宇宙射线轨迹，并在不同刚度下产生多样的CR通量响应。我们建议，暴时主阶段不对称环电流的发展除全球地磁场变化引起的纬度依赖性外，还引入了截止刚度的经向变化。这些变化可以改变磁层内宇宙射线的渐近轨迹，导致粒子对大气层的不同进入。因此，地面观测到的CR通量表现出多样且刚度依赖的响应。研究结果强调了在理解地磁暴期间宇宙射线调制时，除行星际驱动因素外，还应考虑环电流不对称性的重要性。

Keyword:

Forbush decrease

Geomagnetic storm

ICME

Galactic cosmic rays

期刊

Advances in Space Research

IF:

2.8

论文数:

1.8K

被引数:

2.1W

机构

indian institute of geomagnetism

学者数:

论文数: 11

被引数: 2

patkar-varde college

学者数:

论文数: 1

被引数: 0

university of mumbai

学者数:

论文数: 32

被引数: 406

institute for space astrophysics and planetology

学者数:

论文数: 18

被引数: 0

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