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Spatial and Temporal Distributions of Ionospheric Irregularities Derived from Regional and Global ROTI Maps

Chinh Thai Nguyen, Seun Temitope Oluwadare, Nhung Thi Le, Mahdi Alizadeh, Jens Wickert, Harald Schuh
2021 Remote Sensing  
Meanwhile, the global ROTI maps reveal the spatial and temporal distributions of ionospheric scintillations.  ...  The aim of this study is to establish ionospheric irregularity maps using ROTI (rate of TEC index) values derived from conventional dual-frequency GNSS measurements (30-s interval).  ...  We also thank the reviewers and editors very much for taking their time to thoroughly review our article. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs14010010 fatcat:3l7avhyxvjf55al27gpvidgwgm

New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

Iurii Cherniak, Irina Zakharenkova
2017 Earth, Planets and Space  
We extend the use of the ROTI maps for analyzing ionospheric irregularities distribution.  ...  We demonstrate that the meridional slices of the ROTI maps can be effectively used to study the occurrence and temporal evolution of the ionospheric irregularities.  ...  NGI of Argentina (www.igm.gov.ar/NuestrasActividades/Geodesia/Ramsac/), ARGN (ftp://ftp.ga.gov.au) and NZ CORS (ftp:// geonet.org.nz) GNSS networks.  ... 
doi:10.1186/s40623-017-0652-0 fatcat:so7kvuvws5dqfnozlduwpfdwgq

A new way of estimating the spatial and temporal components of the Vertical Total Electron Content gradient based on UPC‐IonSAT Global Ionosphere Maps

Qi Liu, Manuel Hernández‐Pajares, Heng Yang, Enric Monte‐Moreno, Alberto García‐Rigo, Haixia Lyu, Germán Olivares‐Pulido, Raül Orús‐Pérez
2022 Space Weather: The international journal of research and applications  
A global ionospheric disturbance index map, W-index map, use the TEC from Global Ionosphere Map (GIM) refer to the median TEC value of preceding 7 days to  ...  Based on Total Electron Content (TEC) from GNSS receivers, the Rate of Change of TEC Index (ROTI) was proposed as a measure of ionospheric irregularities (Pi et al., 1997) .  ...  Since the grid points of UQRG are distributed on a global scale, the global map of VTEC spatial gradients at each grid point can be derived.  ... 
doi:10.1029/2021sw002926 fatcat:kcbycmvwbjdmlgnybb4czr6pk4

Studying Ionosphere Responses to a Geomagnetic Storm in June 2015 with Multi-Constellation Observations

Yang Liu, Lianjie Fu, Jinling Wang, Chunxi Zhang
2018 Remote Sensing  
The resolution of the TEC estimation, to portray regional ionosphere variation, relies greatly on the spatial distribution of IPP.  ...  The Global Navigation Satellite System (GNSS) observations with global coverage and high temporal and spatial resolution, provide abundant and high-quality Earth-ionosphere observations.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs10050666 fatcat:anh2tdwt3ffujgmkkvfqor5kjy

Ionospheric Plasma Irregularities Characterized by the warm Satellites: Statistics at High Latitudes

Yaqi Jin, Andres Spicher, Chao Xiong, Lasse B. N. Clausen, Guram Kervalishvili, Claudia Stolle, Wojciech J. Miloch
2019 Journal of Geophysical Research - Space Physics  
We derive the irregularity parameters from the electron density in terms of the rate of change of density index and electron density gradients.  ...  The spatial distributions of irregularities depend on the interplanetary magnetic field (IMF).  ...  The Swarm IPIR data set can be accessed through http://tid.uio.no/plasma/swarm/IPIR_ cdf/ and also from ESA Swarm website.  ... 
doi:10.1029/2018ja026063 fatcat:56tto7aytnbavlftuo3idiqeey

Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018

Irina Zakharenkova, Iurii Cherniak, Andrzej Krankowski
2021 Sensors  
Evolution of the intense ionospheric irregularities and equatorward expansion of the auroral irregularities oval were well correlated with increases of geomagnetic activity and peaks of the auroral electrojet  ...  intensity of plasma density gradients and structures over the Southern auroral and polar cap regions.  ...  The daily ROTI maps represent an overall pattern of the spatial distribution of the ionospheric irregularities over the Northern Hemisphere high and middle latitudes.  ... 
doi:10.3390/s21227749 pmid:34833828 pmcid:PMC8624907 fatcat:6phoqji7hnhsnjwmwfp5alirfq

Multi-Scale Ionospheric Anomalies Monitoring and Spatio-Temporal Analysis during Intense Storm

Na Cheng, Shuli Song, Wei Li
2021 Atmosphere  
The Rate of the TEC Index (ROTI) was exploited to investigate the ionospheric scintillation and compared with the temporal dynamics of vertical TEC.  ...  The spatial-temporal dynamics of ionospheric anomalies during the severe geomagnetic storm was reflected in detail.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/atmos12020215 fatcat:kbtlm5scs5h7boydqyjyw35mei

GPS and in situ Swarm observations of the equatorial plasma density irregularities in the topside ionosphere

Irina Zakharenkova, Elvira Astafyeva, Iurii Cherniak
2016 Earth, Planets and Space  
The obtained results demonstrate a high degree of similarities in the occurrence pattern of the seasonal and longitudinal distribution of the topside ionospheric irregularities derived from both types  ...  Here we study the global distribution of the plasma density irregularities in the topside ionosphere by using the concurrent GPS and Langmuir probe measurements onboard the Swarm satellites.  ...  The Jicamarca Radio Observatory is a facility of the Instituto Geofisico del Peru operated with support from the NSF AGS-1433968 through Cornell University.  ... 
doi:10.1186/s40623-016-0490-5 fatcat:ymniqjqvkjgrhk7t6n2ri4qxai

Study of structures of the sporadic E layer by using dense GNSS network observations

Susumu Saito, Keisuke Hosokawa, Jun Sakai, Ichiro Tomizawa
2021 Navigation  
This study utilizes a rate of total electron content (TEC) index (ROTI) map with dense Global Navigation Satellite System (GNSS) observations for effective Es layer detection.  ...  The front direction and drift velocity are successfully derived. Sub-structures in the Es layer front are revealed by analysis using the characteristics of the frontal structure and TEC variation.  ...  Recently, ROTI values have been used to obtain global ionospheric irregularity distributions (Pi et al., 2017) .  ... 
doi:10.1002/navi.454 fatcat:lpyxtm6wszfxlbyz4kohpnptqe

High-latitude ionospheric irregularities: differences between ground- and space-based GPS measurements during the 2015 St. Patrick's Day storm

Iurii Cherniak, Irina Zakharenkova
2016 Earth, Planets and Space  
Daily ROTI maps derived from ground-based and LEO-GPS measurements show the pattern of irregularities oriented in the local noon-midnight direction, which is a signature of SED/TOI development across the  ...  An analysis of the rate of TEC index (ROTI) derived from LEO-GPS data, together with Swarm in situ plasma probe data, allowed us to examine the topside ionospheric irregularities and to compare them to  ...  GPS data from the TerraSAR-X mission are available from the COSMIC Data Analysis and Archive Center (cdaac-http:// www.cosmic.ucar.edu/cdaac/).  ... 
doi:10.1186/s40623-016-0506-1 fatcat:xz65niwesfccdhwxbmftan4uv4

IGS ROTI Maps: Current Status and Its Extension towards Equatorial Region and Southern Hemisphere

Iurii Cherniak, Irina Zakharenkova, Andrzej Krankowski
2022 Sensors  
For auroral and midlatitudes, we present the cross-comparison of ROTI-derived irregularities patterns over the Northern and Southern hemispheres.  ...  Apart from actual ROTI maps product production, we work on the extension of ROTI maps to cover not only the Northern hemisphere but also the area of the Southern hemisphere and equatorial/low latitude  ...  The ROTI maps show the occurrence and spatial distribution of high-latitude ionospheric irregularities.  ... 
doi:10.3390/s22103748 pmid:35632156 pmcid:PMC9145799 fatcat:qhze3lyjejazjm4yzwd3temulm

Topside ionospheric irregularities as seen from multisatellite observations

Irina Zakharenkova, Elvira Astafyeva
2015 Journal of Geophysical Research - Space Physics  
We use in situ data from CHAMP and DMSP satellites, along with data of GPS receiver onboard CHAMP satellite and ground-based GPS receivers to study the occurrence and global distribution of ionospheric  ...  Using the CHAMP GPS measurements, we created maps of GPS phase fluctuation activity and found two specific zones of the most intense irregularities: (1) the region of the auroral oval at high latitudes  ...  We acknowledge the use of NASA/GSFC's Space Physics Data Facility's OMNIWeb (or CDAWeb or ftp) service and OMNI data for data of interplanetary and geophysical parameters (ftp://spdf.gsfc.nasa.gov/ pub  ... 
doi:10.1002/2014ja020330 fatcat:o4fl2ums2rht5e7id2b4vipypi

Ionospheric disturbances observed over Japan following the eruption of Hunga Tonga-Hunga Ha'apai on 15 January 2022

Susumu Saito
2022 Earth, Planets and Space  
The wavelength was longer than the first one and was estimated as 800 km. The first one were associated with ionospheric irregularities represented by the rate of TEC index (ROTI).  ...  In contrast, the second one did not have irregularities all over the TIDs, but in only a limited region.  ...  Acknowledgements GEONET is operated and maintained by the Geospatial Information Authority of Japan. The Kp index data were provided by German Research Centre for Geoscience (GFZ) Potsdam.  ... 
doi:10.1186/s40623-022-01619-0 fatcat:d6dyqd52prai3fh5xs7fcbrlvq

Investigation of the relationship between the spatial gradient of total electron content (TEC) between two nearby stations and the occurrence of ionospheric irregularities

Teshome Dugassa, John Bosco Habarulema, Melessew Nigussie
2019 Annales Geophysicae  
The relation between the occurrence of ionospheric irregularities and the spatial gradient of total electron content (TEC) derived from two closely located stations (ASAB: 4.34∘ N, 114.39∘ E and DEBK:  ...  of ionospheric irregularities.  ...  From the definition, however, ROTI mixes both the spatial and temporal gradients of TEC variations.  ... 
doi:10.5194/angeo-37-1161-2019 fatcat:tok4iagymfg2xjyhbqyjtgjxma

Observation of the ionospheric irregularities over the Northern Hemisphere: Methodology and service

Iurii Cherniak, Andrzej Krankowski, Irina Zakharenkova
2014 Radio Science  
Such maps can be useful for space weather monitoring and navigation by combining them with currently produced IGS global ionospheric maps (GIMs) or regional ionospheric TEC maps.  ...  Occurrence of ionospheric irregularities is difficult to predict and to model, because of the temporal and spatial variability of the ionosphere and solar activities that are driving forces of space weather  ... 
doi:10.1002/2014rs005433 fatcat:3bxg2sk63bfmzkbdbdceugkgqq
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