Zonal Irregularity Drift Characteristics of Ionospheric Scintillations from two closely-spaced Global Navigation Satellite System receivers at an Indian Low Latitude location

Vankadara, Ram Kumar; Dabbakuti, J. R. K. Kumar; Panda, Sampad Kumar

doi:10.1109/csnt54456.2022.9787613

Cited by 5 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the importance of the location, a modern multi-constellation and multi-frequency GISTM receiver (Septentrio-PolaRx5S) has been established recently in the year 2021 that records the slant TEC from all the available constellations along with the scintillation indices and several other parameters [68]. Preliminary observations from this high-end monitoring unit confirmed instances of scintillations and loss of lock scenarios due to intense scintillation activity in October 2022 [69][70][71]. However, most of the earlier investigations conducted at this particular location are based on observation, modeling and forecasting of GPS scintillation indices and belong to the previous solar cycle, i.e., Solar cycle 24.…”

Section: Introductionmentioning

confidence: 98%

Trailing Equatorial Plasma Bubble Occurrences at a Low-Latitude Location through Multi-GNSS Slant TEC Depletions during the Strong Geomagnetic Storms in the Ascending Phase of the 25th Solar Cycle

Vankadara,

Jamjareegulgarn,

Seemala

et al. 2023

Remote Sensing

Self Cite

View full text Add to dashboard Cite

The equatorial plasma bubbles (EPBs) are depleted plasma density regions in the ionosphere occurring during the post-sunset hours, associated with the signal fading and scintillation signatures in the trans-ionospheric radio signals. Severe scintillations may critically affect the performance of dynamic systems relying on global navigation satellite system (GNSS)-based services. Furthermore, the occurrence of scintillations in the equatorial and low latitudes can be triggered or inhibited during space weather events. In the present study, the possible presence of the EPBs during the geomagnetic storm periods under the 25th solar cycle is investigated using the GNSS-derived total electron content (TEC) depletion characteristics at a low-latitude equatorial ionization anomaly location, i.e., KL University, Guntur (Geographic 16°26′N, 80°37′E and dip 22°32′) in India. The detrended TEC with a specific window size is used to capture the characteristic depletion signatures, indicating the possible presence of the EPBs. Moreover, the TEC depletions, amplitude (S4) and phase scintillation (σφ) indices from multi-constellation GNSS signals are probed to verify the vulnerability of the signals towards the scintillation effects over the region. Observations confirm that all GNSS constellations witness TEC depletions between 15:00 UT and 18:00 UT, which is in good agreement with the recorded scintillation indices. We report characteristic depletion depths (22 to 45 TECU) and depletion times (28 to 48 min) across different constellations confirming the triggering of EPBs during the geomagnetic storm event on 23 April 2023. Unlikely, but the other storm events evidently inhibited TEC depletion, confirming suppressed EPBs. The results suggest that TEC depletions from the traditional geodetic GNSS stations could be used to substantiate the EPB characteristics for developing regional as well as global scintillation mitigation strategies.

show abstract

Section: Introductionmentioning

confidence: 98%

Trailing Equatorial Plasma Bubble Occurrences at a Low-Latitude Location through Multi-GNSS Slant TEC Depletions during the Strong Geomagnetic Storms in the Ascending Phase of the 25th Solar Cycle

Vankadara,

Jamjareegulgarn,

Seemala

et al. 2023

Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

“…At the equatorial regions, the zonal wind velocity variation poses a pivotal role in the generation of plasma bubbles which are the primary cause of low-latitude scintillation effects [11]. The zonal irregularities drift velocity is estimated by Vankadara et al [8] using spaced ionospheric monitoring GNSS receiver observations. Abadi et al [12] performed modelling of the occurrence of evening time Equatorial Spread-F by using logistic regression of plasma drift at the equator that causes scintillations in the radio signals.…”

Section: Introductionmentioning

confidence: 99%

“…These studies show that the scintillation characteristics and physical deriving mechanism significantly differ in these three regions because of the different physical mechanisms that lead to the formation of electron density irregularities that produce scintillations [6,7]. Vankadara et al [8] presented the multi-constellation observation of scintillation indices from the ionospheric monitoring Septentrio-PolaRx5S GNSS receiver recordings at a low latitude location in India. Their results show that usually, the occurrence of scintillations is felt between the local dusk and midnight at the equatorial and its nearby regions in the low latitudes.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Characteristics of Phase Scintillation Observed at UKM Station in Malaysia

Seif,

Panda

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

We present a statistical comparison of the seasonal occurrence of ionospheric phase scintillation in the GPS signals at an equatorial region in Malaysia using the ground-based ionospheric monitoring GPS receiver and space-based radio occultation (RO) measurements. The observations were recorded at UKM (2.55°N, 101.461°E) in Malaysia during 2010 using GPS based scintillation and TEC Monitoring setup (GISTM). The space-based measurements were recorded by the FORMOSAT_3/COSMIC (F_3/C) satellites in 2010. The GPS limb-viewing radio occultation technique is an innovative technique that provides ideal geometry to observe vertical ionospheric structures to detect Equatorial Plasma bubbles (EPBs) and Sporadic E layers (Es). Radio waves throughout the irregular equatorial ionosphere are studied to characterize phase scintillations at the L1 frequency in different seasons. Seasonal characteristics of the GPS phase scintillation show it mainly occurs in the equinox months, particularly during March. The results show similar values as the Radio Occultation (RO) observations over UKM station, which demonstrates that March equinox has the maximum occurrence of scintillations with the appearance of EPBs and during June corresponding to the appearance of the Es layer in the ionosphere. We found seasonal characteristics of phase scintillations obtained from the Ground-based station are consistent with seasonal characteristics of amplitude scintillation that occurred from the space-based measurements. Nevertheless, F3/C RO provided an opportunity for concurrent sounding of EPBs and Es characteristic structures across the globe, unlike other traditional ground-based measurements.

show abstract

Loss of Lock Characteristics of Global Positioning System Signals Under Ionospheric Scintillations at Guntur, India

Vankadara,

Panda

2023

2023 International Conference on Smart Systems for Applications in Electrical Sciences (ICSSES)

View full text Add to dashboard Cite

Zonal Irregularity Drift Characteristics of Ionospheric Scintillations from two closely-spaced Global Navigation Satellite System receivers at an Indian Low Latitude location

Cited by 5 publications

References 17 publications

Trailing Equatorial Plasma Bubble Occurrences at a Low-Latitude Location through Multi-GNSS Slant TEC Depletions during the Strong Geomagnetic Storms in the Ascending Phase of the 25th Solar Cycle

Trailing Equatorial Plasma Bubble Occurrences at a Low-Latitude Location through Multi-GNSS Slant TEC Depletions during the Strong Geomagnetic Storms in the Ascending Phase of the 25th Solar Cycle

Seasonal Characteristics of Phase Scintillation Observed at UKM Station in Malaysia

Loss of Lock Characteristics of Global Positioning System Signals Under Ionospheric Scintillations at Guntur, India

Contact Info

Product

Resources

About