Ring current local time dependence during geomagnetic storms using equatorial Dst-proxies

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Santiago Pinzon-Cortes, Natalia Gómez-Pérez, Santiago Vargas Domínguez
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Abstract

In this paper, we calculate Local Disturbance indices (LDi) using data from two equatorial observatories (Ascension ASC and Fúquene FUQ) to use them as Disturbance Storm-time (Dst) index proxies. We find that the LDi response to geomagnetic storms is different depending on the observatory’s local time at the storm onset. In order to explore this local time influence on the measurements on the ground at low latitudes, we build new proxies using two observatories located at approximately the same longitude, in order to balance measurements in the north and south averaging meridional and measuring only zonal variations. The average of the longitude pairs and Dst-index proxies from single observatories exhibit strong correlation to the Dst index (\(\ge \) 0.88) during active periods and a moderate correlation (\(\le \) 0.5) during quiet periods. We find that the storm intensity is associated with local time. We confirm that the fastest variation in the geomagnetic field during the storm is recorded between dusk and midnight, while the region between dawn and noon records more moderate variations, sometimes missing the storm effects altogether. Our results show an azimuthal asymmetry of the magnetospheric ring current, becoming most intense on the night side of the dusk terminator during active periods. We propose a new configuration for local time Dst proxies including the use of equatorial observatories. This will get insights of the evolution of storms in an area where there are limited geomagnetic observatories.

Graphical abstract

地磁风暴期间环流地方时的赤道dst代用关系
本文利用两个赤道观测站(Ascension ASC和Fúquene FUQ)的数据计算了局地扰动指数(LDi),并将其作为扰动风暴时间(Dst)指数的代理。我们发现LDi对磁暴的响应随磁暴发生时天文台当地时间的不同而不同。为了探索这种当地时间对低纬度地面测量的影响,我们使用位于大致相同经度的两个观测站建立了新的代理,以便平衡南北平均经向和仅测量纬向变化的测量。在活跃期,经度对和Dst指数的平均值与Dst指数表现出较强的相关性(\(\ge \) 0.88),而在非活跃期则表现出中等的相关性(\(\le \) 0.5)。我们发现风暴强度与当地时间有关。我们证实,在风暴期间,地磁场在黄昏和午夜之间的变化最快,而在黎明和正午之间的区域记录的变化更为温和,有时完全忽略了风暴的影响。我们的结果显示磁层环电流的方位不对称,在活动期间,在黄昏结束点的夜晚一侧变得最强烈。我们提出了一个新的配置,为当地时间Dst代理包括使用赤道天文台。在地磁观测站有限的地区,这将深入了解风暴的演变。图形摘要
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来源期刊
Acta Geodaetica et Geophysica
Acta Geodaetica et Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.10
自引率
7.10%
发文量
26
期刊介绍: The journal publishes original research papers in the field of geodesy and geophysics under headings: aeronomy and space physics, electromagnetic studies, geodesy and gravimetry, geodynamics, geomathematics, rock physics, seismology, solid earth physics, history. Papers dealing with problems of the Carpathian region and its surroundings are preferred. Similarly, papers on topics traditionally covered by Hungarian geodesists and geophysicists (e.g. robust estimations, geoid, EM properties of the Earth’s crust, geomagnetic pulsations and seismological risk) are especially welcome.
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