2010年1月15日日环食对东非低纬度地区电离层扰动和赤道等离子体气泡的影响

IF 1.6 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Advances in Astronomy Pub Date : 2022-09-21 DOI:10.1155/2022/5263997

Davis Odhiambo Athwart, B. Ndinya, P. Baki

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引用次数: 0

摘要

利用分布在东非低纬度地区环形路径上的六个全球导航和卫星系统接收器的数据，研究了2010年1月15日日日环食对旅行电离层扰动和赤道等离子体气泡的影响。全球导航卫星系统接收器驻扎在肯尼亚的内罗毕（RCMN）、马林迪（MAL2）和埃尔多雷特（MOIU）；乌干达的姆巴拉拉；卢旺达基加利；以及坦桑尼亚的Mtwara（MTWA）。研究期间为2010年1月12日至18日，即2010年1日环食前后三天。2010年标志着太阳周期24的开始阶段，在低总电子含量（TEC）值和扰动风暴时间指数（Dst）中明显观察到。日食7点开始 : 06 LT，10点结束 : 14 LT，其中MOIU和RCMN的日食震级分别为0.946和0.93。最大遮蔽发生在8 : 21 LT和8 : 大多数车站的34 LT。来自GNSS接收器的垂直TEC（VTEC）在全食路径上或接近全食路径时的下降显示，在日食的最大阶段，TECU减少了～2-3。还原水平高度接近总体路径，并在远离总体路径的情况下平稳降低。利用逐日TEC的背景多项式拟合技术，我们分析了NURK-MBAR-MOIU和MOIU-RCMN-MAL2 GPS阵列沿线的TID。结果显示，一个具有830m/s虚拟水平速度和~1 TECU振幅的波状扰动沿着MOIU-RCMN-MAL2 GPS阵列向东传播。该研究报告了0.5的中等闪烁活性 ≤ ROTI ≤ 0.9的值，表明该地区存在少数EPB。结果显示GPS-TEC闪烁活动的纬度变化，并表明日食可能对整个东非观测到的平均闪烁水平的增加产生影响。

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Effects of 15th January 2010 Annular Solar Eclipse on Traveling Ionospheric Disturbances and Equatorial Plasma Bubbles over Low Latitude Regions of East Africa

The influence of the 15th January 2010 annular solar eclipse on traveling ionospheric disturbances (TIDs) and equatorial plasma bubbles (EPBs) is studied using data from six global navigation and satellite system (GNSS) receivers spread across the path of annularity over the low latitude region of East Africa. The GNSS receivers are stationed at Nairobi (RCMN), Malindi (MAL2), and Eldoret (MOIU) in Kenya; Mbarara (MBAR) in Uganda; Kigali (NURK) in Rwanda; and Mtwara (MTWA) in Tanzania. The study period ranges from 12th to 18th January 2010, three days before and after the 15th January 2010 annular solar eclipse. The year 2010 marked the beginning phase of solar cycle 24, evidently observed in low total electron content (TEC) values and the disturbed storm time index (Dst). The eclipse started at 7 : 06 LT and ended at 10 : 14 LT, with MOIU and RCMN experiencing eclipse magnitudes of 0.946 and 0.93, respectively. The maximum obscuration occurred between 8 : 21 LT and 8 : 34 LT across most of the stations. A detrending on vertical TEC (VTEC) derived from GNSS receivers across or close to the path of totality revealed a reduction of ∼2-3 TECU during the maximum phase of the eclipse. The level of reduction was highly close to the totality path and decreased smoothly away from the totality path. Using a background polynomial fitting technique on diurnal TEC, we analyzed TIDs along NURK-MBAR-MOIU and MOIU-RCMN-MAL2 GPS arrays. The results revealed a wavelike perturbation with a virtual horizontal velocity of 830m/s and ∼1 TECU amplitude propagating eastward along the MOIU-RCMN-MAL2 GPS array. The study reports a moderate scintillation activity of 0.5 ≤ ROTI ≤ 0.9 values, demonstrating the presence of few EPBs over the region. The results show a latitudinal variation in GPS-TEC scintillation activities and suggest a possible influence of the eclipse on the observed increase in average scintillation levels across East Africa.

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来源期刊

Advances in Astronomy ASTRONOMY & ASTROPHYSICS-

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

22 weeks

期刊介绍： Advances in Astronomy publishes articles in all areas of astronomy, astrophysics, and cosmology. The journal accepts both observational and theoretical investigations into celestial objects and the wider universe, as well as the reports of new methods and instrumentation for their study.