4 research outputs found
Datasets of ionospheric parameters provided by SCINDA GNSS receiver from Lisbon airport area
Get PDFHere we present datasets provided by a SCINDA GNSS receiver installed in the
Lisbon airport area from November of 2014 to July of 2019. The installed
equipment is a NovAtel EURO4 with a JAVAD Choke-Ring antenna. The data are in
an archived format and include the general messages on quality of records
(*.msg), RANGE files (*.rng), raw observables as the signal-to-noise (S/N)
ratios, pseudoranges and phases (*.obs), receiver position information (*.psn),
ionosphere scintillations monitor (ISMRB; *.ism) and ionospheric parameters:
total electron content (TEC), rate of change of TEC index (ROTI), and the
scintillation index S4 (*.scn). The presented data cover the full 2015 year.
The raw data are of 1-minute resolution and available for each of the
receiver-satellite pairs. The processing and the analysis of the ionosphere
scintillation datasets can be done using a specific "SCINDA-Iono" toolbox for
the MATLAB developed by T. Barlyaeva (2019) and available online via MathWorks
File Exchange system. The toolbox calculates 1-hour means for ionospheric
parameters for each of the available receiver-satellite pairs and averaged over
all available satellites during the analyzed hour. Here we present the
processed data for the following months in 2015: March, June, October, and
December. The months were selected as containing most significant geomagnetic
events of 2015. The 1-hour means for other months can be obtained from the raw
data using the aforementioned toolbox. The provided datasets are interesting
for the GNSS and ionosphere based scientific communities.Comment: arXiv admin note: text overlap with arXiv:1910.0404
Variations of TEC Over Iberian Peninsula in 2015 Due to Geomagnetic Storms and Solar Flares
No full textLink of volcanic activity and climate change in Altai studied in the ice core from Belukha Mountain
No full textIn the present research we discuss a role of volcanic activity in Altai thermal regime. Here we analyses the sulfate and temperature data reconstructed from the natural paleoarchive – ice core from the Belukha Mountain saddle. Sulfate ice-core reconstructions can serve as volcanic markers. The both – sulfate and temperature reconstructions – are for the last 750 years. As the characteristic of volcanic activity we consider Volcanic Explosivity Index (VEI), Dust Veil Index (DVI) and Ice core volcanic index (IVI). The analysis was done using wavelet analysis and analysis of wavelet cross coherence and phase. As the result, we conclude that observed increases in the values of the indexes VEI, DVI, IVI basically correspond to decreases of temperature and increases of sulfate concentrations. This confirms the dependence of changes in the thermal regime of the Altai from volcanic activity. But in the 1750–1850 years period there is a delay of the changes in temperature with respect to the changes in volcanic activity. We suggest that it can be due to the superposition of the influence of solar and volcanic activity on changes in the thermal regime of Altai
Связь вулканической активности и климатических изменений на Алтае по данным исследования ледникового керна горы Белуха
No full textIn the present research we discuss a role of volcanic activity in Altai thermal regime. Here we analyses the sulfate and temperature data reconstructed from the natural paleoarchive – ice core from the Belukha Mountain saddle. Sulfate ice-core reconstructions can serve as volcanic markers. The both – sulfate and temperature reconstructions – are for the last 750 years. As the characteristic of volcanic activity we consider Volcanic Explosivity Index (VEI), Dust Veil Index (DVI) and Ice core volcanic index (IVI). The analysis was done using wavelet analysis and analysis of wavelet cross coherence and phase. As the result, we conclude that observed increases in the values of the indexes VEI, DVI, IVI basically correspond to decreases of temperature and increases of sulfate concentrations. This confirms the dependence of changes in the thermal regime of the Altai from volcanic activity. But in the 1750–1850 years period there is a delay of the changes in temperature with respect to the changes in volcanic activity. We suggest that it can be due to the superposition of the influence of solar and volcanic activity on changes in the thermal regime of Altai.Впервые с помощью вейвлет-анализа и анализа вейвлет-кросскогерентности и фаз проанализирована связь климатических изменений на Алтае, реконструированных по данным высокогорного ледникового керна, взятого с седловины горы Белуха, и вулканической активности, описанной индексами VEI, DVI и IVI, за последние 750 лет. Полученные фазовые соотношения изменений концентраций сульфатов в керне и вулканических индексов, а также противофазные низкочастотные статистически значимые сигналы между индексами вулканической активности и температурой воздуха позволяют говорить о зависимости изменений термического режима на Алтае от вулканической активности. При этом в малый ледниковый период отмечается запаздывание климатических изменений относительно вулканической деятельности, что может быть связано с наложением влияния солнечной активности на изменения термического режима
