当前位置: X-MOL 学术Radio Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse
Radio Science ( IF 1.6 ) Pub Date : 2021-04-23 , DOI: 10.1029/2020rs007215
A. Silwal 1 , S. P. Gautam 2 , P. Poudel 1 , M. Karki 3 , B. Adhikari 4 , N. P. Chapagain 3 , R. K. Mishra 4 , B. D. Ghimire 4 , Y. Migoya‐Orue 5
Affiliation  

The dual‐frequency global positioning system (GPS) data acquired from the UNAVCO over different places of Nepal were processed to examine the eclipse‐triggered consequences on total electron content (TEC) in response to the annular solar eclipse of 15th January 2010 and 21st June 2020. These occasions were exceptional since they occurred during solar minimum, additionally as in a magnetically quiet period. The eclipse phase coincided with the peak ionization‐time at the equatorial and low latitude regions. The solar eclipse of 21st June 2020 was an annular solar eclipse with a magnitude of 0.994. Nepal has witnessed a partial eclipse, starting at ∼10:53 NST (05:08 UT), reached the maximum at ∼12:40 NST (6:55 UT), and ended at ∼14:24 NST (8:39 UT) with the total duration of 3 h and 31 min. The annular solar eclipse of 15th January 2010 had the magnitude of 0.919 and Nepal has witnessed a partial eclipse starting at ∼12:24 NST (6:39 UT), reached the maximum at ∼14:10 NST (8:25 UT), and ended at ∼15:40 NST (9:55 UT). The eclipse effect occurs as a trough‐like depression in the curve of TEC at all the GPS stations indicates the effect of sudden attenuation of solar extreme ultra‐violet irradiation on decayed electron content in the ionosphere over the region. Moreover, the extent of the exhaustion in ionospheric TEC was studied by comparing the eclipse day TEC with mean diurnal ionospheric TEC of five quietest days of the month to investigate the eclipse effect on the electron density of the ionosphere over the stations. The study additionally reveals that the measure of the decrease in vertical value of total electron content is proportional to the obscuration of the lunar disc, that is closely associated with the electron production via the photoionization process. Observing the values of TEC during the eclipse day and comparing it with other quiet days, our study showed an apparent variation during the time of the eclipse, which agrees with previous studies on ionospheric responses to the eclipse as well as theoretical assumptions.

中文翻译:

2010年1月15日至2020年6月21日日食期间电离层总电子含量变化的全球定位系统观测

处理了从UNAVCO在尼泊尔不同地方获取的双频全球定位系统(GPS)数据,以检查因2010年1月15日和6月21日的环形日食而引起的日食触发对总电子含量(TEC)的影响2020年。这些情况非常特殊,因为它们发生在太阳最低峰期间,此外在磁寂期间。蚀相与赤道和低纬度地区的峰值电离时间相吻合。21日的日食2020年6月是环形日食,强度为0.994。尼泊尔目睹了部分月食,开始于NST约10:53(UT 05:08),达到最大时为NST约12:40(UT 6:55),结束于NST约14:24(UT 8:39) ),总时长为3小时31分钟。2010年1月15日的环形日食幅度为0.919,尼泊尔目睹了部分日食出现在NST约12:24(UT 6:39),NST发生处是约14:10 NUT(UT 8:25),并在美国标准时间15:40〜UT(9:55 UT)结束。日食效应在所有GPS站的TEC曲线中呈槽状凹陷出现,表明日照极端紫外线辐射突然衰减对该区域电离层中电子含量下降的影响。而且,通过比较月食日TEC和该月五个最安静日的平均日电离层TEC来研究电离层TEC的耗竭程度,以研究日食对电离层电子密度的影响。这项研究还表明,减少总电子含量垂直值的措施与月球盘的遮盖力成正比,这与通过光电离过程产生的电子密切相关。观测日食期间TEC的值并将其与其他静日进行比较,我们的研究表明日食期间存在明显的变化,这与先前关于电离层对日食的响应以及理论假设相一致。
更新日期:2021-05-07
down
wechat
bug