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Performance Evaluation of VTEC GIMs for Regional Applications during Different Solar Activity Periods, Using RING TEC Values
2021
Remote Sensing
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Time windows selected for the analysis include periods of both low (July 2008 to June 2009) and high (September 2013 to August 2014) solar activity. ...
This paper presents a comparison of the vertical total electron content (vTEC) estimated over Italy using two different approaches: the GPS Global Ionosphere Maps (GIMs) and the so-called "calibration ...
Acknowledgments: The authors are grateful to the IGS community for GIM-TEC and GPS data, and to the National Centers for Environmental Information (NCEI) for K p data. ...
doi:10.3390/rs13081470
fatcat:6bhwshz7nzcf3etls52zjrlu4a
IONORING: Real-Time Monitoring of the Total Electron Content over Italy
2021
Remote Sensing
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The validation is performed by comparing the IONORING TEC maps (in real-time) with independent products: i) the Global Ionospheric Maps (GIM) - final product- provided by the International GNSS Service ...
Subsequent large regional TEC various were observed in response to related follow-on geomagnetic storms. ...
Acknowledgments: Authors are grateful to Luigi "Gg" Ciraolo for the provision of the TEC calibration and the precious discussions about it. ...
doi:10.3390/rs13163290
fatcat:qdr2kojw7vdepazezlezq3jsji
Plasmasphere and Topside Ionosphere Reconstruction using METOP Satellite Data during Geomagnetic Storms
2020
Journal of Space Weather and Space Climate
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The proposed method is evaluated during four geomagnetic storms to check the capabilities of the tomography for space weather monitoring. ...
Our study also reveals that the plasmasphere TEC contribution to ground-based TEC may vary 10 to 60% during geomagnetic storms, and the contribution tends to reduce during the storm-recovery phase ...
location, solar irradiance and solar activity. ...
doi:10.1051/swsc/2020076
fatcat:cwhr62ga6fgslakstgokbll244
High-Precision Ionosphere Monitoring Using Continuous Measurements from BDS GEO Satellites
2018
Sensors
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The precision of calculated vertical TEC (VTEC) using BDS B1/B2, B1/B3, and B2/B3 dual-frequency combinationsis compared and analyzed. ...
Furthermore, the ionospheric monitoring results of site JFNG in the northern hemisphere, and CUT0 in the southern hemisphere during the period from ...
Acknowledgments: The authors would like to sincerely thank IGS MGEX, who provided a large amount of observational data. We also thank the anonymous reviewers for their helpful suggestions. ...
doi:10.3390/s18030714
pmid:29495506
pmcid:PMC5876668
fatcat:ewcevjpbwrgpxmykgnw6vlalwm
Ionospheric Responses to the June 2015 Geomagnetic Storm from Ground and LEO GNSS Observations
2020
Remote Sensing
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At the same time, the latitude range corresponding to the peak value of the up-looking VTEC on the event day becomes wider, which is the precursor of the Equatorial Ionization Anomaly (EIA). ...
Salient positive and negative storms are observed from vertical total electron content (VTEC) based on ground-based GNSS observations at different stages of the storm. ...
Acknowledgments: We thank the following organizations for providing the data used in this work: CSERF, UPC, CDAAC.
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/rs12142200
fatcat:63oantk3lzezndqa44biv6ggqe
Multiinstrument observations of a geomagnetic storm and its effects on the Arctic ionosphere: A case study of the 19 February 2014 storm
2017
Radio Science
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We present a multi-instrumented approach for the analysis of the Arctic ionosphere during the 19 February 2014 highly complex, multiphase geomagnetic storm, which had the largest impact on the disturbance ...
during the event. ...
Acknowledgements The authors wish to thank Lowell Digisonde International for providing access to Thule Digisonde data used in this work; the Greenland GPS Network Data used in this paper can be obtained ...
doi:10.1002/2016rs006106
fatcat:r3bms2gw3zewfbv6y4tcixrdgq
Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
2012
Journal of Geophysical Research
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The values of VTEC at the March equinox exceed that of the September equinox, especially during high solar activity; the winter anomaly is recorded at noon near the geomagnetic poles region, and the effect ...
and its amplitude has a close relationship with the solar activity, and at night this anomaly is recorded during high solar activity and the larger values are located in the South American region. ...
The variability of VTEC in March equinox exceeds September equinox by up to 30% during high solar activity. [37] Figures 3b and 3d show equinoctial maximum during high solar activity. ...
doi:10.1029/2011ja016882
fatcat:772m2o3ekffpncgeyg7q5zl25m
Middle- and low-latitude ionosphere response to 2015 St. Patrick's Day geomagnetic storm
2016
Journal of Geophysical Research - Space Physics
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The American region exhibits the most remarkable increase in vertical total electron content (vTEC), while in the Asian sector, the largest decrease in vTEC is observed. ...
The effects of the storm in each longitudinal sector (Asian, African, American, and Pacific) are characterized using global and regional electron content. ...
the framework of the MONITOR 2 ESA Project), Low Latitude Ionospheric Sensor Network (LISN), and Intermagnet Communities for providing the magnetic data used in this work. ...
doi:10.1002/2015ja022299
fatcat:6z22dbw7vbe6nivqsy2d5ampg4
Enhanced Local Ionosphere Model for Multi-Constellations Single Frequency Precise Point Positioning Applications: Egyptian Case Study
2018
Artificial Satellites
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For kinematic mode, datasets of 2 hours of observations with 1 second sampling rate were logged during vehicular test; the test was carried out on the ring road of the city of Cairo, Egypt, on September ...
While using EIM, achieved an improvements of (38%, 28%, and 42%) and (32%, 10%, and 37%) for accuracy of latitude, longitude, and altitude in comparison with using Klobuchar and GIM models, respectively ...
Also, we tried to evaluate the performance of SFPPP supported by EIM for different applications. ...
doi:10.2478/arsa-2018-0011
fatcat:fjsrsmh7vzfu7kzxvbl5upag3i
B2 Thickness Parameter Response to Equinoctial Geomagnetic Storms
2021
Sensors
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To investigate the behavior of the B2 parameter before, during and after those events, we have analyzed variations of GNSS derived vertical TEC (VTEC) and maximum electron density (NmF2) obtained from ...
Investigation into the time delay of the different measurements according to location showed that B2 reacts before NmF2 and VTEC after the onset of the storms in all the cases. ...
and Sao Explorer software access; the CODE Analysis Center of the IGS at the Astronomisches Institut Universitaet Bern, Switzerland for providing the GIM of VTEC and the IGS, UNAVCO, CORS, SONEL and EUREF ...
doi:10.3390/s21217369
pmid:34770676
pmcid:PMC8588179
fatcat:c4mnafncs5a3talc5nk5ydrdhy
Evaluation of the Effect of Higher-Order Ionospheric Delay on GPS Precise Point Positioning Time Transfer
2020
Remote Sensing
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The difference in the time-link solutions correlates not only with time and region, but also with the length of the time-links. ...
For the difference of the receiver clock solutions, the mean standard deviation of the variations is 3.92 ps in low-latitude, which is much larger than that of 2.59 ps in mid-latitude due to the influence ...
, as well as the Astronomical Institute of the University of Bern (AIUB) and NTSC iGMAS Analysis Center for making the processing software available. ...
doi:10.3390/rs12132129
fatcat:agxhc7n7o5beboprtkozhiqfmu
TEC evidence for near-equatorial energy deposition by 30 keV electrons in the topside ionosphere
2013
Journal of Geophysical Research - Space Physics
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2013 pre-print arXiv:1307.2071v1 fatcat:njukpuhrrrf45jzmagazgd7ome
Observations of energetic electrons (10 - 300 keV) by NOAA/POES and DMSP satellites at heights <1000 km during the period from 1999 to 2010 allowed finding abnormal intense fluxes of ~10^6 - 10^7 cm-2 ...
s-1 sr-1 for quasi-trapped electrons appearing within the forbidden zone of low latitudes over the African, Indo-China, and Pacific regions. ...
Hasebe from Waseda University, Japan, for the SERVIS-1 data. The GIM data were obtained through ftp://ftp.unibe.ch/aiub/CODE/. The ACE solar wind data were provided by N. Ness and D.J. ...
doi:10.1002/jgra.50439
fatcat:2vz3ygo7jvd5hm6a4x5er35uva
Bottom-up control of geomagnetic secular variation by the Earth's inner core
2013
Nature
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The Earth's plasmasphere: modelling and remote sensing 61 J13 From micro-to macro-scales in the heliosphere and magnetospheres 67 J14 Heliospheric structure during the ascending phase of solar cycle 24 ...
The authors of these abstracts are invited to send us the missing data to the following email: jsilvac@geociencias.unam.mx This is equally valid for the case that we committed an error the authors would ...
The hourly, daily, monthly, annual and 12-monthly smoothed values of GEC are derived from JPL GIM-TEC maps for the period 1999-2012 representing the temporal changes of GEC for the different time scales ...
doi:10.1038/nature12574
pmid:24108054
fatcat:vun7xleqonfzpp4c6waif5ji4e
IGS Technical Report 2012
[article]
2013
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Applications of the Global Navigation Satellite Systems (GNSS) to Earth Sciences are numerous. ...
activities. ...
This support and that provided by the International Association of Geodesy (IAG) and the Pan-American Institute for Geography and History (PAIGH) is highly appreciated. ...
doi:10.7892/boris.80303
fatcat:66t4jgzh7fc7payu3dw7mw5igu
An Integrated Transmission-Media Noise Calibration Software For Deep-Space Radio Science Experiments
2014
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The described S/W is planned to be compatible with the current standards for tropospheric noise calibration used by both these agencies like the AMC, TSAC and ESA IFMS weather data, and it natively works ...
All of the three typical deep-space refractive environments (solar plasma, ionosphere, troposphere) are dealt with by employing specific subroutines. ...
Moreover, the activity of the Sun follows the eleven-year sunspot cycle. During solar maxima, the star is more active and emits more radiation. ...
doi:10.6092/unibo/amsdottorato/6519
fatcat:gr65gm3ip5eyvahfz6rn2hwbpi
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