Study of solar flux dependency of the winter anomaly in GPS TEC

Rao, S. S.; Sharma, Siddharth; Pandey, R.

doi:10.1007/s10291-018-0795-x

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…The appearance of double maxima during the solar cycle is a physical phenomenon that has also been observed in accompanying proxies (Gnevyshev, 1963; Kane, 2009, 2010). The double peaks in the TEC profile over a solar cycle are obvious because trends and variabilities in the ionosphere are highly correlated with variations in solar flux/sunspot number (Rao, Sharma, & Pandey, 2019). According to Gnevyshev (1967), the appearance of double maxima during the solar cycle is due to the superposition of northern and southern sunspot maxima.…”

Section: Discussionmentioning

confidence: 99%

Solar Hysteresis Pattern and Spectral Components in TEC Time Series (GPS and TIE‐GCM) of the Quadrilaterally Coupled Geomagnetic Conjugate Low‐Latitude Stations

2023

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The solar radiation reaching the different layers of the ionosphere under quiet geomagnetic conditions has the greatest influence on daytime ionospheric variations (Hargreaves, 1992;Rishbeth, 1998). Although the amount of incoming solar radiation varies throughout the year depending on local time, seasons, latitude, and longitude, ionospheric electrodynamics responds in accordance by altering the temperature, wind effect, and thermospheric neutral density composition (e.g.,

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Section: Discussionmentioning

confidence: 99%

Solar Hysteresis Pattern and Spectral Components in TEC Time Series (GPS and TIE‐GCM) of the Quadrilaterally Coupled Geomagnetic Conjugate Low‐Latitude Stations

2023

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“…Mountains generate relief waves which propagate to the stratosphere and lower thermosphere (Leutbecher and Volkert, 2000). Studies on these waves have been made in Nepal in the lower atmosphere (Regmi and Maharjan, 2015;Regmi et al, 2017). Other studies have shown the impact of relief waves on the ionosphere in the Andes (Torre et al, 2014) and Tibet (Khan and Jin, 2018).…”

Section: Diurnal Variationmentioning

confidence: 99%

Climatology of ionosphere over Nepal based on GPS total electron content data from 2008 to 2018

et al. 2021

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Abstract. In this study, we analyse the climatology of ionosphere over Nepal based on GPS-derived vertical total electron content (VTEC) observed from four stations as defined in Table 1: KKN4 (27.80∘ N, 85.27∘ E), GRHI (27.95∘ N, 82.49∘ E), JMSM (28.80∘ N, 83.74∘ E) and DLPA (28.98∘ N, 82.81∘ E) during the years 2008 to 2018. The study illustrates the diurnal, monthly, annual, seasonal and solar cycle variations in VTEC during all times of solar cycle 24. The results clearly reveal the presence of equinoctial asymmetry in TEC, which is more pronounced in maximum phases of solar cycle in the year 2014 at KKN4 station, followed by descending, ascending and minimum phases. Diurnal variations in VTEC showed the short-lived day minimum which occurs between 05:00 to 06:00 LT (local time) at all the stations considered, with diurnal peaks between 12:00 and 15:00 LT. The maximum value of TEC is observed more often during the spring equinox than the autumn equinox, with a few asymmetries. Seasonal variation in TEC is observed to be a manifestation of variations in solar flux, particularly regarding the level of solar flux in consecutive solstices.

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“…GNSS iyonosfer çalışmaları için önemli bir araç olarak kullanılmaktadır. Buna ek olarak GNSS sistemlerinin konum doğruluğunun artırılması için iyonosferik düzeltmelerin yapılması gerekmektedir [22][23][24][25][26]. GPS sinyaline ilişkin iyonosferik gecikme frekans (f) ve uydu-alıcı arasındaki Eğik Toplam Elektron Miktarı'na (STEC) bağlıdır.…”

Section: Materyal Ve Metotunclassified

Manyetik Fırtına Kaynaklı İyonosferik Değişimlerin GNSS Ölçüleri Kullanılarak İrdelenmesi

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Şentürk

2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Öz 08.09.2017 tarihinde gerçekleşen manyetik fırtınanın iyonosfer tabakasında sebep olduğu değişim, GNSS ölçüleri kullanılarak elde edilen TEC değerleri üzerinden analiz edilmiştir. Kuzey ve güney yarımkürede, iyonosferin farklı bölgelerinde bulunan GNSS istasyonlarına ait RINEX gözlemlerinden TEC değerleri elde edilmiştir. Manyetik fırtına kaynaklı TEC değişiminin ortaya çıkarılabilmesi için manyetik fırtına öncesi 10 gün, manyetik fırtına günü ve sonrası 1 gün olmak üzere her istasyona ilişkin toplam 12 günlük veri değerlendirilmiştir. Yapılan analiz sonucunda manyetik fırtınanın olduğu gün, öncesi ve sonrasında pozitif ve negatif anomaliler elde edilmiştir. Bu çalışma sonucunda Türkiye'de bulunan GNSS istasyonları kullanılarak manyetik fırtına kaynaklı iyonosfer değişimlerinin tespit edilebileceği gösterilmiştir.

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Study of solar flux dependency of the winter anomaly in GPS TEC

Cited by 12 publications

References 22 publications

Solar Hysteresis Pattern and Spectral Components in TEC Time Series (GPS and TIE‐GCM) of the Quadrilaterally Coupled Geomagnetic Conjugate Low‐Latitude Stations

Solar Hysteresis Pattern and Spectral Components in TEC Time Series (GPS and TIE‐GCM) of the Quadrilaterally Coupled Geomagnetic Conjugate Low‐Latitude Stations

Climatology of ionosphere over Nepal based on GPS total electron content data from 2008 to 2018

Manyetik Fırtına Kaynaklı İyonosferik Değişimlerin GNSS Ölçüleri Kullanılarak İrdelenmesi

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