Remote sensing ionospheric variations due to total solar eclipse, using GNSS observations

Alizadeh, Mahdi; Schuh, Harald; Zare, Saeed; Sobhkhiz-Miandehi, Sahar; Tsai, Lung Chih

doi:10.1016/j.geog.2019.09.001

Cited by 18 publications

(12 citation statements)

References 17 publications

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“…For all stations, diurnal TEC variations exhibit clear TEC drop throughout the eclipse hours. The outcomes agree well with the investigations done by enormous researchers around the globe (Alizadeh et al., 2020; Baran et al., 2003; Panda et al., 2013), which advocates for the decrease in TEC during the eclipse hour (day of the eclipse), contrasted with other typical days. On other normal days, we anticipate a steady increment in TEC to a maximum value at peak hours of the day, which is clearly witnessed in Figure 11.…”

Section: Resultssupporting

confidence: 90%

“…As a result of the solar eclipse, an apparent effect on the ionosphere can be witnessed. A solar eclipse occurs when the Moon passes between Earth and the Sun and its shadow falls on the Earth, thereby totally or partly obscuring the Sun for a viewer on Earth (Alizadeh et al., 2020). During a solar eclipse, the amount of the Sun's radiation reaching the earth diminishes and so we can expect less ionization of atoms and lower electron density in the ionosphere (S. Sharma et al., 2010).…”

Section: Introductionmentioning

confidence: 99%

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Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse

et al. 2021

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse

et al. 2021

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“…Just two stations (BRN2 and RMTE) have witnessed eclipse totality, and the remaining three stations have partial solar eclipse (DNGD, NPGJ, and TPLJ). The UNAVCO Data Center handles data management tasks for GPS/GNSS data and products from globally distributed permanent stations [3]. TEQC is the program developed by UNAVCO and supports several GPS tasks that translate to quality control of RINEX and GPS and a calibration method used to obtain TEC.…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

“…It is the longest solar eclipse of the 21st century. There is a decrease in TEC due to the solar eclipse that has been studied by various techniques [2,3], such as measurements derived from the Global Positioning System (GPS). GPS is a tool with the highest accuracy to study the ionosphere dynamics with varying TEC during the eclipse/storm period.…”

Section: Introductionmentioning

confidence: 99%

GPS-TEC observations over Nepal during the Total Solar Eclipse on 22 July 2009

Shrestha¹,

Migoya-Orué

2021

J. Nep. Phys. Soc.

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This paper explores the ionospheric response in terms of Total Electron Content (TEC) during the 22 July 2009 Total Solar Eclipse. Using the data stored at Biratnagar (BRN2), Ramite (RMTE), Dhangadhi (DNGD), Nepalganj (NPGJ), and Taplejung (TPLJ) Global Positioning System (GPS) stations, the ionospheric activity was investigated through changes in TEC. Our research is based on GPS-TEC measurements from a widely dispersed GPS network across various geographical locations in Nepal, taking place on July 17-21 as a pre-event, July 22 as the main event, and July 23-27 as a post-event. The analysis reveals that the reduction in the TEC level is proportional to the magnitude of the total solar eclipse. The variation of the TEC depends on latitude as well as longitude. We found that TEC depletion was up to 5% from pre-event to main-event and up to 30% from main-event to post-event during the totality of the eclipse. The eclipse was accompanied by the 10-hour geomagnetic storm in Nepal, which was the explanation for the TEC upgrade to 50% on the main event day from pre-event and decreased by 25% from main-event to post-event. The result obtained in this work demonstrates the influence of the eclipse/storm on the variation of TEC.

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“…The ionosphere is a dynamic layer of the upper part of the atmosphere, which generally changes according to radiation emitted by the sun and solar-related ionospheric disturbances. Different natural and artificial phenomena affect the physical and chemical behavior of the ionosphere [1]. Among these, the solar eclipse is a phenomenon that has a direct influence on the Earth's ionosphere.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric Response over Nepal during the 26 December 2019 Solar Eclipse

et al. 2021

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On 26th December 2019, during morning hours, an annular solar eclipse having a magnitude of 0.96 with a 118 km wide antumbra occurred and lasted for 3 minutes and 40 seconds at the point of maximum eclipse. The partial eclipse was visible in most of Asia, parts of North/East Africa, and North/West Australia. In the context of Nepal, only the partial eclipse was visible from ~ 8:34 LT (02:51 UT) and ended at ~ 11:40 LT (05:55 UT). It was 2 hours 47 mins and 54 secs long with the maximum visible eclipse time at ~ 10:01 LT (04:16 UT). Our study is based on Global Navigation Satellite System (GNSS) measurements from a widely distributed Global Positioning System (GPS) network over different places of Nepal on the day of the eclipse, a day before, and a day after the eclipse. We investigated the ionospheric behavior through the changes in Total Electron Content (TEC) during the partial eclipse by using the data archived at the five different GPS stations of Nepal. The result reveals that there is significant depletion of TEC, in some cases greater than 20% compared to other normal days. Observing the values of TEC before, during, and after the event, 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.

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Remote sensing ionospheric variations due to total solar eclipse, using GNSS observations

Cited by 18 publications

References 17 publications

Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse

Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse

GPS-TEC observations over Nepal during the Total Solar Eclipse on 22 July 2009

Ionospheric Response over Nepal during the 26 December 2019 Solar Eclipse

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