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Characteristics of equatorial nighttime spread F - An analysis on season-longitude, solar activity and triggering causes

机译：赤道夜间扩散的特点 - 季节经度，太阳能活动和触发原因分析

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摘要

To understand global variability and triggering mechanisms of ionospheric nighttime equatorial spread F (ESF), we analyzed measurements from satellite and a ground-based GPS station for the years between 2010 and 2017. In this study we present seasonal-longitudinal as well as monthly variability of ESF occurrence for solar minimum and yearly variations of ESF occurrence for solar maximum and minimum periods. One of the long standing open questions in the study of ESF is what exactly initiates the Rayleigh-Taylor (RT) plasma instability growth. This question is the focus of the present work. Zonal background eastward electric field and E × B upward plasma drift speed patterns are found to be critically important in understanding plasma irregularity formation. In addition to particular patterns observed on these parameters, the background plasma density in the local evening hours just before the onset of ESF occurrence is very important. Stronger plasma densities just before the onset of irregularities resulted in stronger plasma irregularities, while relatively less dense plasma just before the onset of irregularities resulted in relatively lower plasma irregularities. Seasonal variations in ESF activity between March and September equinox seasons with comparable plasma densities can be defined in terms of the rate of change of solar flux F10.7 (dF10.7/day) index. Strongest ESF occurrence and strongest dF10.7/day are measured in the same month out of all other months in 2016 and 2017. Longitudinal variations of ESF activity in our measurements are related to longitudinal variations of plasma densities. We also found that ESF occurrence is better correlated with rate of change of F10.7 index for months in equinox seasons than for months in solstice seasons for the years between 2013 and 2016.
机译：要了解电离层夜间赤道扩展F（ESF）的全局变异性和触发机制，我们在2010年至2017年期间分析了卫星和地面GPS站的测量。在这项研究中，我们呈现季节性纵向以及月度变异性ESF发生太阳能最小和ESF的年度变化，对太阳能最大值和最短时期发生的ESF发生。研究ESF研究中的长期开放问题之一是粗略泰勒（RT）等离子体不稳定增长的究竟是什么。这个问题是目前工作的重点。在理解血浆不规则形成方面，发现地形背景向东电场和E×B上等离子体漂移速度模式在理解血浆不规则性形成方面是至关重要的。除了在这些参数上观察到的特定模式之外，在ESF发生的开始前的当地傍晚时期的背景等离子体密度非常重要。在不规则性发作之前，血浆密度更强，导致血浆不规则较强，而在脱模前的血浆畸形前的相对较小的血浆导致血浆不规则相对较低。 3月和9月股份季节与9月间季节的季节性变化可以在太阳能F10.7（DF10.7 /日）指数的变化率方面定义具有可比等离子体密度的季节。最强的ESF发生和最强大的DF10.7 /日在2016年和2017年的所有其他月份的同月衡量。我们测量中ESF活性的纵向变化与血浆密度的纵向变化有关。我们还发现，ESF发生与2013年至2016年间多数季节的季节中数月的F10.7指数的变化率更好地相关。

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  • 来源
    《Advances in space research》 |2020年第1期|95-106|共12页
  • 作者

    Ephrem Beshir; Melessew Nigussie; Mark B. Moldwin;

  • 作者单位

    Space Science and Application Research Development Department Entoto Observatory and Research Center (EORC) Ethiopian Space Science and Technology Institute (ESSTI) Addis Ababa Ethiopia;

    Washera Geospace and Radar Science Laboratory Physics Department Bahir Dar University Bahir Dar Ethiopia;

    Climate and Space Sciences and Engineering University of Michigan USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ESF; Zonal eastward electric field; E × B; IEF_y; ROTI; RODI; F10.7;

    机译：ESF;地区东部电场;e×b;IEF_Y;Roti;罗迪;F10.7;

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