Annual and semi-annual variations of TEC over Nepal during the period of 2007–2017 and possible drivers

Ghimire, Basu Dev; Gautam, Bibek; Chapagain, Narayan P.; Bhatta, Karan

doi:10.1007/s11600-021-00721-3

Artykuł - szczegóły

Tytuł artykułu

Annual and semi-annual variations of TEC over Nepal during the period of 2007–2017 and possible drivers

Autorzy

Ghimire Basu Dev , Gautam Bibek , Chapagain Narayan P. , Bhatta Karan

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-021-00721-3

Warianty tytułu

Języki publikacji

Abstrakty

The total electron content (TEC) variation of the ionospheric layer is mostly controlled by Geomagnetic and solar activity. The TEC of the ionosphere can be estimated using the satellite signal delay recorded at GPS sites. In this study, the TEC data from three nearby GPS stations (CHLM, BMCL, and LMJG) from Nepal are extracted for about 11 years period (2007–2017). For the computation of the TEC data, wavelet transform, global wavelet power spectrum, cross wavelet trans form, and wavelet coherence techniques are used. Utilizing such long-term GPS TEC data, Annual Oscillation (AO) and Semi-annual Oscillation (SAO) are identified in the daytime and nighttime TEC over Nepal. The SAO is found to be dominating periodicity in the daytime TEC, whereas the AO is found to dominant at night. In addition, possible connections with the indicators of geomagnetic and solar activity were studied. The geomagnetic indices AE and AU are exhibit a change in phase and are most consistent with both daytime and nighttime AO, implying that these indices could be the likely drivers of TEC’s AO and SAO periodicities. The Dst index, on the other hand, is recognized as the most prominent driver of SAO in both daytime and nighttime TEC.

Słowa kluczowe

solar indices TEC annual oscillation AO semi-annual oscillation SAO wavelet techniques

indeksy słoneczne TEC roczna oscylacja AO półroczna oscylacja SAO techniki falkowe

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2022

Tom

Vol. 70, no 2

Strony

929--942

Opis fizyczny

Bibliogr. 55 poz.

Twórcy

autor

Ghimire Basu Dev

basu.ghimire99@gmail.com

Central Department of Physics, Institute of Science and Technology, Tribhuvan University, Kirtipur, Nepal
St. Xavier’s College, Maitighar, Kathmandu, Nepal
Gyan Research Academy for Communication and Education (GRACE), Kathmandu, Nepal

https://orcid.org/0000-0003-4768-625X

autor

Gautam Bibek

St. Xavier’s College, Maitighar, Kathmandu, Nepal

autor

Chapagain Narayan P.

Amrit Campus, Tribhuvan University, Thamel, Nepal

autor

Bhatta Karan

Gyan Research Academy for Communication and Education (GRACE), Kathmandu, Nepal

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).

Typ dokumentu

Bibliografia

Identyfikator YADDA

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