Multi-constellation GNSS Ionospheric Scintillation Monitoring through PolaRx5S Receiver at a low latitude station in India

Vankadara, Ram Kumar; Reddybattula, Kanaka Durga; Panda, Sampad Kumar

doi:10.1109/wiecon-ece54711.2021.9829648

Cited by 3 publications

(1 citation statement)

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“…The recordings from this monitoring unit report weak to strong scintillation activities at times, associated with a specific number of GNSS satellite signals [64][65][66][67]. 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].…”

Section: Introductionmentioning

confidence: 99%

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

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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.

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