İyonosfer tabakası, Küresel Konumlandırma Sistemi (GPS) uydularına ait radyo sinyallerinin frekanslarına bağlı olarak zaman gecikmesine neden olan bir ortamdır. Çoğu iyonosferik çalışma, GPS gözlemlerinden elde edilen toplam elektron içeriği (TEC) değişimleri kullanılarak gerçekleştirilmektedir. Günümüzde iyonosferin fiziksel yapısı ile ilgili çalışmalar, uzay iklim koşullarının tahmini, konuml...

We report effects in the upper high-latitude atmosphere related to interaction of fast magnetosheath plasma streams, so-called jets, with dayside magnetopause. The jets were observed by THEMIS mission magnetosphere during a quiet day on 12 July 2009. It was found that jet accompanied strong localized compression and penetration suprathermal inside magnetosphere. caused prominent magnetic variat...

The ionosphere serves as a critical medium for radio signal propagation in outer space. A good morphology of the global TEC distribution is very useful both ionospheric studies and their relative applications. In this work, deep learning framework was constructed better spatial estimation TEC. Both DCGAN WGAN-GP were considered, performances evaluated with completion regional using correlation ...

Ionospheric forecasts are critical for space-weather anomaly detection. Forecasting ionospheric total electron content (TEC) from the global navigation satellite system (GNSS) is of great significance to near-earth space environment monitoring. In this study, we propose a novel TEC forecasting model based on deep learning, which consists convolutional neural network (CNN), long-short term memor...

The disturbances of the ionosphere caused by thunderstorms or lightning events in troposphere have an impact on global navigation satellite system (GNSS) signals. Gravity waves (GWs) triggered are one main factors that drive short-period Travelling Ionospheric Disturbances (TIDs). At mid-latitudes, ionospheric GWs can be detected GNSS However, at low latitudes, multi-variability leads to diffic...

With the rapid development of global navigation satellite systems (GNSS) and their increasingly wide range applications in atmospheric science, total electron content (TEC) data are widely used theoretical study layer coupling related to seismicity. This detected analyzed pre-earthquake ionospheric anomalies (PEIA) by using TEC from Royal Observatory Belgium (ROB), coseismic disturbance (CID) w...

Abstract The number of devices equipped with global satellite positioning has exceeded seven billion recently. There are a wide variety receivers regarding their accuracy and reliability. Low cost, multi-frequency units have been released on the market latterly; however, single-frequency is still significant. Since measurements influenced by ionospheric delay, accurate ionosphere models utmost ...

The ionospheric total electron content (TEC) is susceptible to factors, such as solar and geomagnetic activities, resulting in the enhancement of its non-stationarity nonlinear characteristics, which aggravate impact on radio communications. In this study, based NeuralProphet hybrid prediction framework, a regional TEC model (multi-factor model, MF-NPM) considering multiple factors was construc...

Single point positioning (SPP) can meet the requirements of majority real-time time transfer applications. Meanwhile, a single-frequency (SF) receiver is cheaper than dual-frequency receiver. However, SPP performance be greatly affected by large pseudorange observation noise. Phase smoothing an effective approach to reduce Since classical phase-smoothed algorithm does not account for effect ion...