Z. Naturforsch. 56 b, 453^457 (2001); received March 9, 2001 catena-Octatellurium(2+), Main Group Element Clusters, Chalcogen Polycations The reaction of Te, TeCl4 and BiC^ in a sealed evacuated glass ampoule in a temperature gradient 160 to 90 °C yields Te8[Bi4Cli4] as black platelike crystals with a golden lustre which are deposited in the temperature zone 150 to 130 °C. The best yield is obt...

The global ionospheric maps (GIMs), generated by Jet Propulsion Laboratory (JPL) and Center for Orbit Determination in Europe (CODE) during a period over 13 years, have been adopted as the primary source of data to provide global ionospheric correction for possible single frequency positioning applications. The investigation aims to assess the performance of new NeQuick model, NeQuick 2, in pre...

We report our analysis of ionospheric disturbances from the 15 January 2022 Tonga volcano eruption, using GPS data International GNSS Service network and ionosonde in Australian sector. Wave fluctuations with amplitudes ∼1 TECU altitude variations ∼100 km were observed data, respectively. In near-field region around shortly after reveals that had an azimuthally anisotropic velocity profile, a p...

We report on simultaneous observation of artificial plasma density irregularities near the magnetic zenith (MZ) by incoherent scatter radar and GNSS satellite in high latitude. During an EISCAT (European Incoherent Scatter Scientific Association) HF heating experiment, a GLONASS signal intersected disturbed ionospheric volume along local field lines. The amplitude phase were simultaneously pert...

Abstract This work developed a modified U‐Net model (a convolutional network architecture) to predict global Total Electron Content (TEC) maps. The input includes the current TEC map, F 10.7 , time history of Interplanetary Magnetic Field B z and SYM‐H in previous 4 days, Hour Day, Day Year. output is map several hours or days ahead. was trained validated on brand new database, VISTA (Video Imp...

The total electron content (TEC) over the Iberian Peninsula was modelled using PCA-MRM models based on decomposition of observed TEC series principal component analysis (PCA) and reconstruction daily modes’ amplitudes by a multiple linear regression model (MRM) space weather parameters as regressors. following are used: proxies for solar UV XR fluxes, number flares different classes, wind inter...

This study presents a new modeling approach that aims for long time predictions (more than 12 h) of ionospheric disturbances driven by solar storm events. The proposed model shall run in an operational framework to deliver fast and precise localized warnings these the future. wind data uses base historical impacts covering two cycles reconstruct future events resulting disturbances. basic compo...

In this paper, we investigate anomalies in total electron content (TEC) from 7 stations of the Africa Geodetic Reference Frame (AFREF) during initial and recovery stages geomagnetic storm 19 February 2014. Additionally, study storms under solar activity ascending period March 2012 low May 2017 to emphasize scintillation effects, especially nighttime. We employ a 15-days median-average sliding w...

The Sporadic-E (Es) layer is an often-observed phenomenon at high latitudes; however, our understanding of the polar cap Es severely limited due to scarce number measurements. Here, first comprehensive study associated with Global Positioning System (GPS) Total Electron Content (TEC) variations and scintillations presented multiple measurements Resolute, Canada (Canadian Advanced Digital Ionoso...

In this contribution, the processing strategies of real-time BeiDou System (BDS) precise orbits, clocks, and ionospheric corrections in the National BDS Augmentation Service System (NBASS) are briefly introduced. The Root Mean Square (RMS) of BDS predicted orbits are better than 10 cm in radial and cross-track components, and the accuracy of the BDS real-time clock is better than 0.5 ns for Inc...