Results 1 to 10 of about 3,517 (221)

Analysis of Ionospheric VTEC Retrieved from Multi-Instrument Observations [PDF]

Atmosphere
This study examines the Vertical Total Electron Content (VTEC) estimation performance of multi-instruments on a global scale during different ionospheric conditions. For this purpose, GNSS-based VTEC data from Global Ionosphere Maps (GIMs), COSMIC (F7/C2)
Gurkan Oztan, Huseyin Duman, Salih Alcay   +2 more
exaly   +4 more sources

Analysis of ionospheric VTEC disturbances before and after the Yutian Ms7.3 earthquake in the Xinjiang Uygur Autonomous Region

Geodesy and Geodynamics, 2014
An earthquake with a magnitude of Ms7.3 hit Yutian in the Xinjiang Uygur Autonomous Region on February 14, 2014. This research investigates the interference phenomena in solar activities and geomagnetics, and adopts the quartile method to analyze the ...
Wang Xinzhi, Ke Fuyang
exaly   +4 more sources

Comparison of IRI-2016 model with IGS VTEC maps during low and high solar activity period

Results in Physics, 2019
This paper presents a comparison of IRI-2016 model vertical total electron content (VTEC) predictions and the International GNSS Service (IGS) VTEC maps during low and high solar activity, from 2000 to 2017. The comparison is carried out by investigation
Chuang Shi, Cheng Wang, Zhipeng Wang
exaly   +4 more sources

A Novel Technique for High-Precision Ionospheric VTEC Estimation and Prediction at the Equatorial Ionization Anomaly Region: A Case Study over Haikou Station

Remote Sensing, 2023
This paper introduces a novel technique that uses observation data from GNSS to estimate the ionospheric vertical total electron content (VTEC) using the Kriging–Kalman method.
Hai-Ning Wang, Qing-Lin Zhu, Xiang Dong, Dong-Sheng Sheng, Yong-Feng Zhi, Chen Zhou, Bin Xu   +6 more
doaj   +1 more source

General resource for ionospheric transient investigations (GRITI): An open-source code developed in support of the Dinsmore et al. (2021) results

MethodsX, 2021
The analysis techniques and the corresponding software suite GRITI (General Resource for Ionospheric Transient Investigations) are described. GRITI was used to develop the Dinsmore et al.
Ross Dinsmore, J.D. Mathews, Julio Urbina   +2 more
doaj   +1 more source

Medium-term ionospheric response to the solar and geomagnetic conditions at low-latitude stations of the East African sector

Cogent Engineering, 2023
In this study, we used GPS-TEC measurements from six stations in East Africa located in low/equatorial latitudes to investigate medium-term ionospheric response to solar and geomagnetic circumstances during 2014–2016.
Shumet Woldemariam, Tsegaye Gogie
doaj   +1 more source

Epidemiological importance of humans and domestic animals as reservoirs of verocytotoxin-producing Escherichia coli [PDF]

Vojnosanitetski Pregled, 2006
Background/Aim. A "new" pathogenic agent, verocytotoxin - producing Escherichia coli (VTEC) emerged in the last 20 years, causing an increased number of sporadic cases, as well as of outbreaks of diarrhoeal diseases.
Lazić Srđan, Čobeljić Miloje, Dimić Bane, Opačić Dolores, Stojanović Valentina   +4 more
doaj   +1 more source

On the global ionospheric diurnal double maxima based on GPS vertical total electron content

Journal of Space Weather and Space Climate, 2022
Ionospheric diurnal double maxima (DDM) is a twin-peak pattern in the ionospheric electron density/total electron content (TEC) during the daytime. Understanding the characteristics of DDM is essential to study the physical mechanisms of the ionosphere ...
Chen Peng, Wang Rong, Yao Yibin, An Zhiyuan, Wang Zhihao   +4 more
doaj   +1 more source

Some traits of Verotoxin-producing strains of Escherichia coli isolated from cattle [PDF]

Veterinarski Glasnik, 2010
Verotoxin-producing Esherichia coli (VTEC) is one of six pathogenicity groups of Eschericha coli. The reservoir for VTEC is the intestinal tract of domestic animals, primarily ruminants. Investigations in our geographic region have also demonstrated that
Lazić Srđan, Stajković Novica, Dimić Bane, Lepšanović Zorica, Krstić Milena, Čekanac Radovan, Mladenović Jovan, Jadranin Žarko, Radaković Sonja, Rađen Slavica   +9 more
doaj   +1 more source

New Lightning‐Derived Vertical Total Electron Content Data Provide Unique Global Ionospheric Measurements

Space Weather, 2022
A newly released, novel ionospheric data set of global gridded vertical total electron content (VTEC) is introduced in this paper. This VTEC data set, provided by Los Alamos National Laboratory (LANL), is derived from very high frequency (VHF; defined as
Erin H. Lay, Jeffery D. Tippmann, Kyle C. Wiens, Sarah E. McDonald, Anthony J. Mannucci, Xiaoqing Pi, Anthea Coster, R. Marc Kippen, Michael J. Peterson, Rob Redmon   +9 more
doaj   +1 more source