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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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This study analyze the climatology of ionosphere over Nepal based on GPS derived VTEC during years 2008 to 2018. The study illustrates the diurnal, monthly, annual, seasonal and solar cycle variations of VTEC. The results clearly revel the presence of equinoctial asymmetry in TEC in maximum phases in 2014 followed by descending, ascending and minimum phases. The winter anomalies are noticed during increasing and maximum phases of the solar cycle 2011 and 2014 from almost all stations considered.
Preprints
https://doi.org/10.5194/angeo-2020-82
https://doi.org/10.5194/angeo-2020-82

  11 Dec 2020

11 Dec 2020

Review status: this preprint is currently under review for the journal ANGEO.

Climatology of ionosphere over Nepal based on GPS TEC data from 2008 to 2018

Drabindra Pandit1,6, Basudev Ghimire1,6, Christine Amory-Mazaudier2,3, Rolland Fleury4, Narayan Prasad Chapagain5, and Binod Adhikari6 Drabindra Pandit et al.
  • 1Central Department of Physics, IOST, Tribhuvan University, Kathmandu, Nepal
  • 2Sorbonne Universités UPMC Paris 06, LPP, Polytechnique, France
  • 3T/ICT4D Abdus Salam ICTP, Italy
  • 4Lab-STICC, UMR 6285, Institut Mines-Telecom Atlantique, site de Brest, France
  • 5Amrit Campus, Tribhuvan University, Thamel, Kathmandu, Nepal
  • 6Department of Physics, St. Xavier’s College, Mait ighar, Kathmandu, Nepal

Abstract. In this study, we analyze the climatology of ionosphere over Nepal based on GPS derived VTEC observed from four stations: KKN4 (27.80° N, 85.27° E), GRHI (27.95° N, 82.49° E), JMSM (28.80° N, 83.74° E), DLPA (28.98° N,82.81° E) during years 2008 to 2018. The study illustrates the diurnal, monthly, annual, seasonal and solar cycle variations of VTEC during all time of solar cycle 24. The results clearly revel the presence of equinoctial asymmetry in TEC which is more pronounced in maximum phases of solar cycle in year 2014 at KKN4 station followed by descending, ascending and minimum phases. Diurnal variation of VTEC showed short-lived day minimum which occurs between 5:00 to 6:00 LT at all the stations considered with diurnal peak between around 12:00 to 15:00 LT. The maximum value of TEC is observed during spring equinox than autumn equinox with a few anomalies. Similarly, winter anomalies are noticed during increasing and maximum phases of the solar cycle2011 and 2014 from almost all stations taken in the study.

Drabindra Pandit et al.

 
Status: open (until 20 Feb 2021)
Status: open (until 20 Feb 2021)
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Drabindra Pandit et al.

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Short summary
This study analyze the climatology of ionosphere over Nepal based on GPS derived VTEC during years 2008 to 2018. The study illustrates the diurnal, monthly, annual, seasonal and solar cycle variations of VTEC. The results clearly revel the presence of equinoctial asymmetry in TEC in maximum phases in 2014 followed by descending, ascending and minimum phases. The winter anomalies are noticed during increasing and maximum phases of the solar cycle 2011 and 2014 from almost all stations considered.
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