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View article: Magnetically Quiet‐Time Traveling Ionospheric Disturbances Over Mid‐Latitude Eastern Europe Observed by the Kharkiv Incoherent Scatter Radar During the 24th Solar Cycle
Magnetically Quiet‐Time Traveling Ionospheric Disturbances Over Mid‐Latitude Eastern Europe Observed by the Kharkiv Incoherent Scatter Radar During the 24th Solar Cycle Open
We have detected and characterize traveling ionospheric disturbances (TIDs) in the mid‐latitude ionosphere over Europe using data from the Kharkiv incoherent scatter (IS) radar. The study focused on observations near solstices and equinoxe…
View article: Multi-instrument analysis of medium-scale travelling ionospheric disturbances generated by an intense tropospheric jet-front system with severe convection in Europe in August 2023
Multi-instrument analysis of medium-scale travelling ionospheric disturbances generated by an intense tropospheric jet-front system with severe convection in Europe in August 2023 Open
Tropospheric jet-front systems and intense convection are known to be potential sources of atmospheric gravity waves (AGWs), which can propagate upward. When AGWs reach the height of the coupled thermosphere-ionosphere system, they interac…
View article: Magnetically quiet-time traveling ionospheric disturbances over mid-latitude Eastern Europe observed by the Kharkiv incoherent scatter radar during the 24th solar cycle
Magnetically quiet-time traveling ionospheric disturbances over mid-latitude Eastern Europe observed by the Kharkiv incoherent scatter radar during the 24th solar cycle Open
View article: Integrating plasmasphere, ionosphere and thermosphere observations and models into a standardised open access research environment: The PITHIA-NRF international project
Integrating plasmasphere, ionosphere and thermosphere observations and models into a standardised open access research environment: The PITHIA-NRF international project Open
The PITHIA-NRF project “Plasmasphere Ionosphere Thermosphere Integrated Research Environment and Access services: a Network of Research Facilities” aims at building a European distributed network that integrates observations from space and…
View article: Impacts of Storm “Zyprian” on Middle and Upper Atmosphere Observed from Central European Stations
Impacts of Storm “Zyprian” on Middle and Upper Atmosphere Observed from Central European Stations Open
Mesoscale convective systems are effective sources of atmospheric disturbances that can reach ionospheric heights and significantly alter atmospheric and ionospheric conditions. Convective systems can affect the Earth’s atmosphere on a con…
View article: Total Root Electron Content: A New Metric for the Ionosphere Below Low Earth Orbiting Satellites
Total Root Electron Content: A New Metric for the Ionosphere Below Low Earth Orbiting Satellites Open
Powerful lightning strikes generate broadband electromagnetic signals. At Extremely Low Frequencies (ELF), the signal partly leaks into the ionosphere and produces whistlers that can be detected by satellites. Indeed, the satellites of the…
View article: Analysis of MSTIDs triggered by dynamical events
Analysis of MSTIDs triggered by dynamical events Open
It is well known that the ionosphere is a highly dynamic medium, and the electron density can vary significantly within a very short period of time at a given location. One of the reasons for the irregular variations are ionospheric signat…
View article: Absence of High Frequency Echoes From Ionosondes During the 23–25 April 2023 Geomagnetic Storm; What Happened?
Absence of High Frequency Echoes From Ionosondes During the 23–25 April 2023 Geomagnetic Storm; What Happened? Open
We report an unusual event on absence of high frequency (HF) echoes in ionosonde observations from the ionospheric F2 region during the geomagnetic storm of 23–25 April 2023. This event was observed in both southern and northern hemisphere…
View article: Synchronous observations of traveling ionospheric disturbances by the multipoint Doppler sounding, ionosonde and the incoherent scatter radar: Case study
Synchronous observations of traveling ionospheric disturbances by the multipoint Doppler sounding, ionosonde and the incoherent scatter radar: Case study Open
In this paper, we present quiet-time (18 September and 19 December 2018) behavior of the midlatitude ionosphere over Eastern Europe. We used data obtained from incoherent scatter (IS) radar, ionosonde and coherent Doppler HF sounding syste…
View article: Multi‐Instrument Observations of Various Ionospheric Disturbances Caused by the 6 February 2023 Turkey Earthquake
Multi‐Instrument Observations of Various Ionospheric Disturbances Caused by the 6 February 2023 Turkey Earthquake Open
In this work, we investigate various types of ionospheric disturbances observed over Europe following the earthquake that occurred in Turkey on 6 February 2023. By combining observations from Doppler sounding systems, ionosondes, and GNSS …
View article: Large-scale traveling ionospheric disturbances over central and eastern Europe during moderate magnetic storm period on 22–24 September 2020
Large-scale traveling ionospheric disturbances over central and eastern Europe during moderate magnetic storm period on 22–24 September 2020 Open
We present the results of ground based remote sensing observations of large-scale traveling ionospheric disturbances (LSTIDs) occurring during the moderate magnetic storm evolution (22–24 September 2020) over central and eastern Europe. Th…
View article: CME Propagation Through the Heliosphere: Status and Future of Observations and Model Development
CME Propagation Through the Heliosphere: Status and Future of Observations and Model Development Open
The ISWAT clusters H1+H2 have a focus on interplanetary space and its characteristics, especially on the large-scale co-rotating and transient structures impacting Earth. SIRs, generated by the interaction between high-speed solar wind ori…
View article: Investigating the effect of large solar flares on the ionosphere based on novel Digisonde data comparing three different methods
Investigating the effect of large solar flares on the ionosphere based on novel Digisonde data comparing three different methods Open
Increased solar radiation during solar flare events can cause additional ionization and enhanced absorption of the electromagnetic (EM) waves in the ionosphere leading to partial or even total radio fade-outs. In this study, the ionospheri…
View article: CME propagation through the heliosphere: Status and future of observations and model development
CME propagation through the heliosphere: Status and future of observations and model development Open
The ISWAT (International Space Weather Action Teams) heliosphere clusters H1 and H2 have a focus on interplanetary space and its characteristics, especially on the large-scale co-rotating and transient structures impacting Earth. Solar win…
View article: MSTID forecasting methodology and data inventory
MSTID forecasting methodology and data inventory Open
T-FORS project aims at providing new models able to interpret a broad range of observations of the solar corona, the interplanetary medium, the magnetosphere, the ionosphere and the atmosphere, and to issue forecasts and warnings for TIDs …
View article: Multi-instrument observations of various ionospheric disturbances caused by the 6 February 2023 Turkey earthquake
Multi-instrument observations of various ionospheric disturbances caused by the 6 February 2023 Turkey earthquake Open
In this work, we investigate various types of ionospheric disturbances observed over Europe after the earthquake in Turkey on 6 February 2023.By combining observations from Doppler sounding systems, ionosondes, and GNSS receivers, we are a…
View article: Relationships Between foF2 and Various Solar Activity Proxies
Relationships Between foF2 and Various Solar Activity Proxies Open
To study ionospheric climate, to model the ionosphere (e.g., the International Reference Ionosphere—IRI) and to investigate its long‐term changes and trends, solar activity proxies/indices have been used, because long and homogeneous data …
View article: Multiinstrumental observations of traveling ionospheric disturbances over Europe
Multiinstrumental observations of traveling ionospheric disturbances over Europe Open
The paper presents results of the analysis of the TID activity and changes in the regular ionospheric variability observed over central and eastern Europe during geomagnetically quiet days, and during CME and CIR/HSSS-related storms. We an…
View article: Swarm Absolute Scalar Magnetometer burst mode: from instrument validation to routine observation of intense lightning activity
Swarm Absolute Scalar Magnetometer burst mode: from instrument validation to routine observation of intense lightning activity Open
Over the past 10 years, the ESA Swarm mission led to many scientific successes sometimes way beyond its primary science targets. One such example is the unanticipated science allowed by the experimental 250 Hz burst mode magnetic scalar da…
View article: Ionospheric variability observed in connection to mesoscale systems above Europe
Ionospheric variability observed in connection to mesoscale systems above Europe Open
Ionospheric plasma is highly variable in a wide range of scales.Atmospheric waves originating in the lower atmosphere seems to contribute substantially to its variability.Particular mesoscale systems are assumed to be effective in generati…
View article: T-FORS: a project to develop TID forecasting systems
T-FORS: a project to develop TID forecasting systems Open
View article: Atmospheric and ionospheric waves induced by the Hunga eruption on 15 January 2022; Doppler sounding and infrasound
Atmospheric and ionospheric waves induced by the Hunga eruption on 15 January 2022; Doppler sounding and infrasound Open
SUMMARY The massive explosive eruption of the Hunga volcano on 15 January 2022 generated atmospheric waves that were recorded around the globe and affected the ionosphere. The paper focuses on observations of atmospheric waves in the tropo…
View article: What is happening with the Sun - and ionospheric impact?
What is happening with the Sun - and ionospheric impact? Open
To model ionospheric climate and to study its long-term changes we need solar activity proxies, because long and homogeneous data series of solar ionizing flux are not available. Here we use solar activity proxies/indices F10.7, sunspot nu…
View article: The Socioeconomic Impacts of the Upper Atmosphere Effects on LEO Satellites, Communication and Navigation Systems
The Socioeconomic Impacts of the Upper Atmosphere Effects on LEO Satellites, Communication and Navigation Systems Open
<p>The near-Earth space environment undergoes daily changes driven by variable conditions in the Sun. Explosive eruptions of energy from the Sun causing minor solar storms on Earth are relatively common and of little consequence. On …
View article: Investigating the variation of the ionospheric absorption during large solar flares based on modern Digisonde data
Investigating the variation of the ionospheric absorption during large solar flares based on modern Digisonde data Open
<p>As a result of the enhanced X-ray and EUV fluxes following large solar flares, the electron density of the ionospheric layers increases. Furthermore, it causes higher absorption or even partial or total fade-out of the emitted rad…
View article: Multi-instrument detection in Europe of ionospheric disturbances caused by the 15 January 2022 eruption of the Hunga volcano
Multi-instrument detection in Europe of ionospheric disturbances caused by the 15 January 2022 eruption of the Hunga volcano Open
The 15 January 2022 eruption of the Hunga volcano provides a unique opportunity to study the reaction of the ionosphere to large explosive events. In particular, this event allows us to study the global propagation of travelling ionospheri…
View article: Investigating Lightning Generated ELF Whistlers to improve ionospheric models (ILGEW)Deliverable 08: Updated ILGEW Dataset User Manual
Investigating Lightning Generated ELF Whistlers to improve ionospheric models (ILGEW)Deliverable 08: Updated ILGEW Dataset User Manual Open
View article: Observation and modelling of whistlers in the ELF as observed by Swarm satellites during regular ASM burst sessions
Observation and modelling of whistlers in the ELF as observed by Swarm satellites during regular ASM burst sessions Open
<p>The magnetic component of electromagnetic signals in the Extremely Low Frequencies (ELF) has been rarely observed from space. The Swarm satellites have the capability of observing part of this spectral band during burst sessions o…
View article: Differences in regular and storm time ionospheric variability at magnetically conjugated locations of the Northern and Southern Hemisphere&#160;
Differences in regular and storm time ionospheric variability at magnetically conjugated locations of the Northern and Southern Hemisphere  Open
<p>The paper is focused on differences/similarities in regular daily ionospheric variability and in the ionospheric response to CME- and CIR/CHSS-related magnetic disturbances above magnetically conjugated ionospheric stations locate…
View article: Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm
Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm Open