强烈地磁风暴期间太阳风结构的全球相对地球有效性：以三明治结构CME驱动的强烈地磁风暴为例

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-02-13 DOI:10.1016/j.asr.2025.02.013

Victor U. Chukwuma , Bolarinwa J. Adekoya , Eugene O. Onori , Oluwafunmilayo O. Ometan , Aghogho Ogwala

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引用次数: 0

摘要

对2016年10月13日地磁风暴期间，CME沿96-145oE子午线沿赤道、低纬度和中纬度电离层的鞘层-磁云-鞘层-夹心结构进行了电离层响应研究。研究的主要目的是揭示太阳风结构的全球相对地球有效性，并阐明在风暴不同阶段电离层响应的主要风暴时间驱动机制。我们的研究结果表明，在恢复阶段[O]/[N2]比值强烈耗竭的一些站点出现正风暴，同时指出等离子体在等离子层和电离层之间交换的有效性，这引起了人们对电离层响应可能是不同驱动因素之间复杂相互作用的现象的关注；单凭观察往往很难区分一种驱动力和另一种驱动力。我们的研究结果还表明，鞘I虽然具有半半球地球有效性，但缺乏全球地球有效性。鞘层II的地球有效性为54.01%，比磁云的地球有效性为45.99%。鞘II相对较高的地质有效性似乎是由于太阳风压力的增加。Boudouridis等人（2005）表明，向南的IMF条件加上较高的太阳风压，导致太阳风与地球磁层之间的耦合增强，从而显著提高了太阳风的地球有效性。此外，鞘1的非地理有效性可能是由于鞘1的时空位置在太阳风压高（6.83nPa≤Psw≤10.23nPa）时，沿96-145oE子午线的站点位于日侧。在鞘层II的时空定位过程中，太阳风动压的增加可能导致了磁云产生半球间正风暴，而鞘层II产生半球间负风暴的极性差异。

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On global relative geo-effectiveness of solar wind structures during an intense geomagnetic storm: A case study of an intense geomagnetic storm driven by sandwich-structured CME

An investigation was undertaken of ionospheric responses during the geomagnetic storm of Oct 13, 2016, regarding the observed configuration of sheath I-magnetic cloud-sheath II sandwich structure of the CME along the equatorial-, low-, and mid-latitude ionosphere along 96–145^oE meridian lines. The aim of the study was to primarily reveal the global relative geo-effectiveness of the solar wind structures and elucidate the dominant storm-time driving mechanism that accounts for the ionospheric responses during the different phases of the storm.

Our results indicate that the occurrence of positive storms at some of the stations with intense depletion of the

[O] / {[N}_{2}]

ratio during the recovery phase while pointing to the efficacy of plasma exchange between the plasmasphere and the ionosphere draws attention to the fact that ionospheric response is a phenomenon that is possibly due to the complex interplay among the different drivers; it is often difficult to distinguish one driving force from another based on observations alone.

Our results also show that sheath I, though hemispherically geoeffective lacked global geo-effectiveness. The sheath II, with a global geo-effectiveness of 54.01 %, is more geoeffective than the magnetic cloud which has a geoeffective of 45.99 %. The comparatively higher geo-effectiveness of Sheath II is plausibly due to increased solar wind pressure. Boudouridis et al. (2005) have shown that southward IMF conditions combined with increased high solar wind pressure lead to enhanced coupling between the solar wind and the terrestrial magnetosphere which significantly increases the geo-effectiveness of the solar wind. Furthermore, the non-geo-effectiveness of Sheath I is plausibly a result of the fact that the period of the spatiotemporal location of Sheath I when the solar wind pressure was high

(6.83 n P a \leq P s w \leq 10.23 n P a)

the stations along 96–145^oE meridian lines were on the dayside. And the increased solar wind dynamic pressure during the spatiotemporal location of Sheath II possibly contributed to the observed polarity differences with the magnetic cloud producing interhemispheric positive storms, and Sheath II producing negative interhemispheric negative storms.

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.