GPS TEC variations under quiet and disturbed geomagnetic conditions during the descending phase of 24th solar cycle over the Indian equatorial and low latitude regions

Lissa, D.; Venkatesh, K.; Prasad, D. S. V. V. D.; Niranjan, K.; Seemala, G. K.

doi:10.1016/j.asr.2021.04.021

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…This explains the positive effect of recurrent geomagnetic disturbances on the TEC during the ascending, maximum and descending phases of solar cycle 24, but the significant effect during the descending phase. This result confirms Lissa et al [42] with data from other equatorial stations in the Indian sector, who showed that the positive effect of thunderstorms is more marked during the minimum and descending phases of solar cycle 24. The low impact of recurrent geomagnetic activity observed during the ascending and maximum phases, as well as the positive effect observed during the descending phase, can be justified by the occurrence of recurrent geomagnetic days.…”

Section: Tec Variations Under Quiet and Recurrent Geomagnetic Conditionssupporting

confidence: 91%

“…Furthermore, CIRs enhance this effect by increasing the amplitude of the predominant ecliptic fields, increasing the peak of the projected component of the recurrent activity peak [58], thus leading to higher TEC values observed during recurrent activity compared to quiet activity. These variations are generally more pronounced at mid-and high-latitudes [42].…”

Section: Monthly Variations In Tec Inmentioning

confidence: 92%

“…Generally speaking, these graphs show that the correlation coefficient values are higher on recurrent days (ranging from 0.94 to 0.98) than on quiet days (0.92) at the Koudougou station. However, taking into account the seasonal variation in TEC at three stations in India, Lissa et al [42] found that the correlation coefficient values of TEC with F10.7 are higher in quiet periods than in disturbed periods. This observed difference could be explained by the position of the stations or also by the effect of the contribution of the seasons to the variation of the TEC.…”

Section: Tec Dependence On Solar Flux Under Quiet and Recurrent Geoma...mentioning

confidence: 99%

“…Panels a, b, and c of Figure 3 show that the maximum mean diurnal TEC value lies between 1300 and 1500 UT at the Koudougou station, for quiet and disturbed days, regardless of the phase of the solar cycle. Ghimire et al [48] found a range between 0900 UT and 1100 UT at two nearby stations, BESI (28.228˚N; 84.739˚E) and GHER (28.375˚N; 84.739˚E) in Nepal, while Lissa et al [42] found a range between 1300 UT and 1500 UT at the Bangalore, Waltair, and Hyderabad stations in India. This means that the diurnal variation in TEC is influenced by the station position.…”

Section: Tec Dependence On Solar Flux Under Quiet and Recurrent Geoma...mentioning

confidence: 99%

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Total Electron Content during Recurrent and Quiet Geomagnetic Periods at the Koudougou Station in Burkina Faso

Sawadogo,

Gnabahou,

Pahima

et al. 2023

IJAA

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In this work, the comparative study of total electron content (TEC) between recurrent and quiet geomagnetic periods of solar cycle 24 at Koudougou station with geographical coordinates 12˚15'N; -2˚20'E was addressed. This study aims to analyze how geomagnetic variations influence the behavior of TEC in this specific region. The geomagnetic indices Kp and Dst were used to select quiet and recurrent days. Statistical analysis was used to interpret the graphs. The results show that the mean diurnal TEC has a minimum before dawn (around 0500 UT) and reaches a maximum value around 1400 UT, progressively decreasing after sunset. In comparison, the average diurnal TEC on recurrent days is slightly higher than on quiet days, with an average difference of 7 TECU. This difference increases with the level of geomagnetic disturbance, reaching 21 TECU during a moderate storm. The study also reveals significant monthly variations, with March and October showing the highest TEC values for quiet and recurrent days, respectively. Equinox months show the highest mean values, while solstice months show the lowest. Signatures of semi-annual, winter and equatorial ionization anomalies were observed. When analyzing annual variations, it was found that the TEC variation depends significantly on F10.7 solar flux, explaining up to 98% during recurrent geomagnetic activity and 92% during quiet geomagnetic activity.

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Section: Tec Variations Under Quiet and Recurrent Geomagnetic Conditionssupporting

confidence: 91%

Section: Monthly Variations In Tec Inmentioning

confidence: 92%

Section: Tec Dependence On Solar Flux Under Quiet and Recurrent Geoma...mentioning

confidence: 99%

Section: Tec Dependence On Solar Flux Under Quiet and Recurrent Geoma...mentioning

confidence: 99%

See 2 more Smart Citations

Total Electron Content during Recurrent and Quiet Geomagnetic Periods at the Koudougou Station in Burkina Faso

Sawadogo,

Gnabahou,

Pahima

et al. 2023

IJAA

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show abstract

“…The computation and calibration of TEC are done by the well-known method prescribed by Gopi Seemala by using the biasing error [62][63][64][65]. The operational region of the IGS station is approximately 300 km in radius, and it contains the epicenter of the earthquake, allowing for detecting changes in the ionosphere as well as the atmosphere.…”

Section: Data and Methodologiesmentioning

confidence: 99%

Preseismic Perturbations and their Inhomogeneity as Computed from Ground‐ and Space‐Based Investigation during the 2016 Fukushima Earthquake

Biswas

Kundu

Sasmal³

et al. 2023

Journal of Sensors

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We present the atmospheric anomalies instigated through seismogenic sources by a multichannel observation using ground- and satellite-based systems. This study emphasizes the seismic event which happened on the east coast of Japan, near the Fukushima Prefecture on November 21, 2016 (in UTC), with a magnitude of 6.9 and a depth of 11.4 km. We mainly focus on the atmospheric and ionospheric irregularities via acoustic and electromagnetic channels originating from earthquakes in the process of the lithosphere, atmosphere, and ionospheric coupling (LAIC) mechanism. In the acoustic channel, we study the seismogenic atmospheric gravity wave (AGW) which perturbs the local lower atmosphere. The observation of nighttime fluctuations in the very low frequency (VLF) signals and total electron content (TEC) is used to investigate the atmospheric perturbation through the electromagnetic channel. For the ground-based observations, a VLF signal network consisting of 5 receivers in Japan is used to study by recording the VLF amplitude transmitted from the Japanese transmitter JJI (22.2 kHz). VLF nighttime fluctuation is used to check the unusualities due to the earthquake. Preseismic wavelike structures having periods of AGW are observed in the nighttime signal. Direct investigation of such AGWs is done by computing the potential energy related to AGW from the sounding of the atmosphere using broadband emission radiometry (SABER) temperature profiles mounted on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite. Ionospheric TEC inspection is done by using a ground-based global navigation satellite system (GNSS) receiver from the International GNSS Survey (IGS) station MIZU in Japan and observing anomalies in diurnal TEC around 6 and 10 days prior to the earthquake. We also obtain the wavelike structure of AGW from the small-scale fluctuation of TEC using wavelet analysis. All the parameters are found to be preseismic for this earthquake; the acoustics channel gives more consistent outcomes than the electromagnetic channel.

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ROTI and scintillation index correlation under quiet and disturbed periods over an Indian low latitude station, Waltair

Lissa,

Seemala,

Venkatesh

et al. 2024

Advances in Space Research

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GPS TEC variations under quiet and disturbed geomagnetic conditions during the descending phase of 24th solar cycle over the Indian equatorial and low latitude regions

Cited by 6 publications

References 28 publications

Total Electron Content during Recurrent and Quiet Geomagnetic Periods at the Koudougou Station in Burkina Faso

Total Electron Content during Recurrent and Quiet Geomagnetic Periods at the Koudougou Station in Burkina Faso

Preseismic Perturbations and their Inhomogeneity as Computed from Ground‐ and Space‐Based Investigation during the 2016 Fukushima Earthquake

ROTI and scintillation index correlation under quiet and disturbed periods over an Indian low latitude station, Waltair

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