ROTI Maps: a new IGS ionospheric product characterizing the ionospheric irregularities occurrence

Cherniak, Iurii; Krankowski, Andrzej; Zakharenkova, Irina

doi:10.1007/s10291-018-0730-1

Cited by 88 publications

(92 citation statements)

References 35 publications

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“…To investigate the ionospheric response in this case, we try to solve the problem using multi‐instrumental observations from several LEOs with a combination of all‐available ground‐based GNSS observations including GLONASS transionospheric links. The ground‐based GPS observations are widely used to study the ionospheric irregularities development at equatorial and polar regions (e.g., Cherniak et al, ; Valladares et al, ). But, the ground‐based GPS/GNSS can provide only two‐dimensional projection of plasma structures from all ionospheric altitudes and not always does it allow recognizing the nature of these irregularities.…”

Section: Resultsmentioning

confidence: 99%

“…We augmented the common GPS‐based data set through the joint GPS&GLONASS data processing. We explained in detail the GPS&GLONASS data processing and ROTI calculation in Zakharenkova et al (), Cherniak and Zakharenkova (), and Cherniak et al (). First, the ROTI values were calculated for every passage of GPS and GLONASS satellites (elevation above 20°) over a GNSS station.…”

Section: Databasementioning

confidence: 99%

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Multi‐Instrumental Observation of Storm‐Induced Ionospheric Plasma Bubbles at Equatorial and Middle Latitudes

Cherniak

Zakharenkova²,

Sokolovsky

2019

JGR Space Physics

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June solstice is considered as a period with the lowest probability to observe typical equatorial plasma bubbles (EPBs) in the postsunset period. The severe geomagnetic storm on 22-23 June 2015 has drastically changed the situation. Penetrating electric fields associated with a long-lasting southward IMF support favorable conditions for postsunset EPBs generation in the dusk equatorial ionosphere for several hours. As a result, the storm-induced EPBs were progressively developed over a great longitudinal range following the sunset terminator. The affected area has a large longitudinal range of~100°in the American sector and a rather localized zone of~20°in longitude in the African sector. Plasma depletions of equatorial origin were registered at midlatitudes (30°-40°magnetic latitude) of both hemispheres in the African and American longitudinal sectors. We examine global features of the large-scale plasma depletion by using a combination of ground-based and space-borne measurements-ground-based Global Positioning System/Global Navigation Satellite System (GPS/GNSS) networks, Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) GPS Radio Occultation (RO), Swarm upward looking GPS data, and in situ plasma density observations provided by Swarm, Communications/Navigation Outage Forecasting System (C/NOFS), and Defense Meteorological Satellite Program (DMSP) missions. Joint analysis of the satellite observations revealed that these storm-induced EPBs structures had extended over 500 km in altitude, at least from~350 to~850 km. These irregularities caused strong amplitude and phase scintillations of GPS/GNSS signals for ground-based and space-borne (COSMIC RO) measurements and seriously affected performance of navigation-based services.

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Section: Resultsmentioning

confidence: 99%

Section: Databasementioning

confidence: 99%

Multi‐Instrumental Observation of Storm‐Induced Ionospheric Plasma Bubbles at Equatorial and Middle Latitudes

Cherniak

Zakharenkova²,

Sokolovsky

2019

JGR Space Physics

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“…ROTI has been considered as a prospective and potential indicator of the presence of ionospheric irregularities and associated scintillations, as it can be easily derived from dual‐frequency observations from both regular GNSS receivers and special receivers dedicated to ionospheric scintillation research. Due to the merits of ROTI, the ionospheric working group of the International GNSS Service has recommended a new official/operational product for space weather monitoring at high latitudes (Cherniak et al, ). The new product has been demonstrated in the form of ROTI map by making use of a large number of permanent GNSS stations in regional and international networks (e.g., Cherniak et al, , ).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the merits of ROTI, the ionospheric working group of the International GNSS Service has recommended a new official/operational product for space weather monitoring at high latitudes (Cherniak et al, ). The new product has been demonstrated in the form of ROTI map by making use of a large number of permanent GNSS stations in regional and international networks (e.g., Cherniak et al, , ). In previous work, the ROTI was estimated from GPS measurements only.…”

Section: Introductionmentioning

confidence: 99%

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On Inconsistent ROTI Derived From Multiconstellation GNSS Measurements of Globally Distributed GNSS Receivers for Ionospheric Irregularities Characterization

Liu

Yang

et al. 2019

Radio Science

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This study for the first time presents an investigation into the exploitation of multi‐Global Navigation Satellite System (GNSS) observations (Global Positioning System, Globalnaya Navigazionnaya Sputnikovaya Sistema, Galileo, and BeiDou) to characterize ionospheric plasma irregularities, based on the rate of change of total electron content index (ROTI) sampled at 1 s. It is demonstrated that the multi‐GNSS ROTIs can represent temporal evolutions of ionospheric plasma irregularities during a large geomagnetic storm. However, an inconsistency in the magnitudes of multi‐GNSS ROTIs is found among a variety of GNSS receivers (i.e., Javad, Leica, Trimble, and Septentrio). Through cross comparisons between GNSS receivers installed at zero/short baselines and validations by receivers distributed separately, it is observed that the magnitude of ROTI corresponding to each system differs between closely installed and even collocated receivers of different models, as well as between the GNSS signals on the same frequency. From 1‐year (i.e., 2015) data analysis, it is found that the magnitudes of multi‐GNSS ROTIs exhibit the dependence on the receiver type. Among the four GNSS receiver types, the largest discrepancy in the multi‐GNSS ROTIs is observed from Septentrio receivers, while the smallest one is shown by Trimble receivers. A one‐to‐one comparison indicates that the ROTI difference is noticeable and can increase to 4–6 TECu/min under ionospheric irregularities conditions, that is, in the postsunset period of 18–02 local time. To investigate the inconsistency, the effect of adopting different equivalent noise bandwidths in the tracking loop design is discussed, via cross comparisons between a GNSS software‐defined receiver and a collocated Septentrio receiver. The result shows that adopting 15‐ and 2‐Hz noise bandwidths in the tracking loop can cause 0.2‐ to 0.5‐TECu/min differences in the magnitude of ROTI, suggesting that the diverse tracking techniques deployed by various receivers are very likely a major contributor to the inconsistency of multi‐GNSS ROTIs.

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Evaluation of Different Methods for Calculating the ROTI index over Brazilian Sector

Carmo

Nardin

Figueiredo

et al. 2020

Preprint

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Ionospheric irregularities are known to interfere in the Global Navigation Satellite System (GNSS) radio signals leading to increases in positioning errors as a function of the Total Electron Content (TEC) dayto-day variability (Hoque & Jakowski, 2008). In addition, ionospheric scintillation caused by Equatorial Plasma Bubbles (EPBs) degrades the transmission of the signal that goes from the satellite to the receiver, which can cause the loss-of-lock in the receiver (Moraes et al., 2017). Thus, the low latitude ionospheric irregularities have been widely studied in the Brazilian sector using several techniques, such as ionosonde (

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ROTI Maps: a new IGS ionospheric product characterizing the ionospheric irregularities occurrence

Cited by 88 publications

References 35 publications

Multi‐Instrumental Observation of Storm‐Induced Ionospheric Plasma Bubbles at Equatorial and Middle Latitudes

Multi‐Instrumental Observation of Storm‐Induced Ionospheric Plasma Bubbles at Equatorial and Middle Latitudes

On Inconsistent ROTI Derived From Multiconstellation GNSS Measurements of Globally Distributed GNSS Receivers for Ionospheric Irregularities Characterization

Evaluation of Different Methods for Calculating the ROTI index over Brazilian Sector

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