The effects of solar radiation and geomagnetic disturbance during consecutive 27-day recurrent geomagnetic storms on variations of equatorial ionospheric parameters and spread F

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Thana Yeeram
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Abstract

This study investigates contributions of solar radiation and geomagnetic activity of consecutive 27-day recurrent geomagnetic storms (RGSs) to the variabilities in the equatorial ionospheric F-region in American Peruvian sector during 2007. Results show the ionospheric responses to the RGSs are quasi-periodic and multifaceted with highly evolved in the summer months. In High-Intensity Long-Duration Continuous \(AE\) Activity (HILDCAA) events, the ionospheric responses are more variable than in non-HILDCAA. The critical frequency and peak height of the F-layer tend to increase during storm-time in summer months. The maximum density enhancements are more than 70% in the three RGSs and they are long-lasting in the summer months. A new classification of daily variations in the virtual height of the F-layer (\(h'F\)) is proposed: Mode A shows mixing of great height before noon and low height near midnight, Mode B shows moderate height near midnight, and Mode C shows mixing of high height before noon and great height near midnight. These \(h'F\) Modes efficiently characterize the ionospheric variabilities and processes. The great uplifts of \(h'F\) during night-time in the summer months coincide with the presence of strong disturbance dynamo electric fields and disturbed neutral winds generated by intensified Joule heating. The solar EUV plays a role in the uplifts of \(h'F\) during the daytime. Zonal electric field disturbances and perturbations in the neutral meridional winds critically contribute to the equatorial ionospheric responses and ESF variabilities. Most cases of inhibited/suppressed ESF were observed in Mode A and occurred under overshielding conditions. The inhibited ESF associated with \(h'F\) not raised in the recovery phase is mainly contributed by a cooling state after great uplifts by daytime thermospheric winds.

Abstract Image

连续 27 天周期性地磁暴期间太阳辐射和地磁扰动对赤道电离层参数变化和 F 传播的影响
这项研究调查了太阳辐射和连续 27 天的经常性地磁暴的地磁活动对 2007 年期间美洲秘鲁地区赤道电离层 F 区变化的贡献。结果表明,电离层对经常性地磁暴的反应是准周期性的、多方面的,在夏季月份高度演变。在高强度长时间连续活动(HILDCAA)事件中,电离层响应比非高强度长时间连续活动(HILDCAA)事件中的电离层响应更加多变。F 层的临界频率和峰值高度往往在夏季风暴期间增加。在三个 RGS 中,最大密度增强超过 70%,而且在夏季持续时间较长。对 F 层虚高的日变化提出了一种新的分类方法:模式 A 显示正午前大高度和近午夜低高度的混合,模式 B 显示近午夜中等高度的混合,模式 C 显示正午前高高度和近午夜大高度的混合。这些模式有效地描述了电离层的变化和过程。夏季夜间的(h'F())大幅上升与强扰动动力电场的存在和焦耳加热加剧产生的扰动中性风相吻合。太阳超紫外线在白天的\(h'F\)上升中起了作用。带状电场扰动和中性经向风扰动对赤道电离层响应和 ESF 变异起了关键作用。在模式 A 中观测到了大多数抑制/压制 ESF 的情况,并且发生在过屏蔽条件下。与恢复阶段未升高的 \(h'F\) 相关的受抑制的 ESF 主要是由日间热层风大幅抬升后的冷却状态造成的。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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