Results 61 to 70 of about 723 (151)

F region drift observations from Athens Digisonde [PDF]

Radio Science, 2006
Ionospheric drift measurements are of significant importance in the monitoring of the upper atmosphere dynamics and an important contributor toward the deeper understanding of the ionospheric electrodynamics. An interesting perspective for operational ionospheric drift measurements comes from the HF radars, such as the Digisondes.
Anna Belehaki, Ioanna Tsagouri, George Michalareas, Themistocles Herekakis   +3 more
openaire   +1 more source

New Observations of Cosmic Noise Absorption in the South American Magnetic Anomaly (SAMA) Using a Next‐Generation Riometer

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study reports the first observations of cosmic noise power (CNP) and cosmic noise absorption (CNA) obtained with a next‐generation riometer installed at the Southern Space Observatory (SSO/INPE) in Brazil, located within the South American Magnetic Anomaly (SAMA).
J. Moro, E. Correia, C. M. Wrasse, J. R. Costa, J. V. Bageston, C. M. Denardini, A. J. Valcorte, L. C. A. Resende, A. M. Santos, L. A. da Silva, J. P. Marchezi, T. S. Trondsen   +11 more
wiley   +1 more source

The March and April 2023 ionospheric storms over Europe

Frontiers in Astronomy and Space Sciences
This paper presents a deep and comprehensive multi-instrumental analysis of two distinct ionospheric storms occurring in March and April 2023. We investigate the ionospheric response in the middle-latitudinal European region utilizing ionospheric ...
Zbyšek Mošna, Veronika Barta, Kitti Alexandra Berényi, Jens Mielich, Tobias Verhulst, Daniel Kouba, Jaroslav Urbář, Jaroslav Chum, Petra Koucká Knížová, Habtamu Marew, Kateřina Podolská, Rumiana Bojilova   +11 more
doaj   +1 more source

Global Effect of Long‐Lasting 07–12 October 2024 Geomagnetic Storms During the Transition From a Strong (G3) to a Severe (G4) on the Geomagnetic Field and Ionospheric Parameters Distribution

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study investigates the co‐evolution of geomagnetic field disturbances with ionospheric parameters and their characteristic latitudinal signatures by conducting a location and time‐dependent analysis of the 07–12 October 2024 events, to fill crucial gaps in understanding the coupled response of the magnetosphere‐ionosphere system. This has
Yekoye Asmare Tariku
wiley   +1 more source

Development and Cancellation of Long‐Duration Positive Ionospheric Storms: Both Changes of the F2‐Layer Peak Height and O/N2 Ratio Can Be Decisive

Space Weather, Volume 24, Issue 7, July 2026.
Abstract For decades, two competing hypotheses on the key drivers of mid‐latitude long‐duration positive ionospheric storms (LDPS) have been considered: (a) an increase of the F2‐layer peak height (hmF2) and (b) an increase in the atomic oxygen to molecular nitrogen density ratio (O/N2).
D. V. Kotov, M. O. Reznychenko, P. G. Richards, O. V. Bogomaz, L. P. Goncharenko, L. J. Paxton, M. Hernández‐Pajares, A. I. Reznychenko, D. P. Shkonda, V. V. Barabash, L. Ya. Emelyanov, I. F. Domnin, A. Ye. Miroshnikov, V. P. Burmaka, D. A. Dzyubanov, Yu. I. Podyachiy   +15 more
wiley   +1 more source

Altura Real da Ionosfera: Uma Comparação entre Dois Métodos

Brazilian Journal of Geophysics, 1991
O perfrl de altura real da ionosfera obtido a partir de ionogramas é uma ferramenta muito útil para os estudos ionosféricos. Neste trabalho faz-se uma comparaçáo entre os perfis deduzidos usando dois métodos: poLAN e Digissonda.
Inez S. Batista, Lucia A. T. Limiro, M. A. Abdu   +2 more
doaj   +1 more source

Validation of the IRI‐2020 Model Topside Ionosphere Options Through COSMIC‐1 and COSMIC‐2 Radio Occultation Profiles Collocated With Ionosonde Observations

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study validates the four topside ionosphere model options included in the latest release of the International Reference Ionosphere (IRI‐2020) model: IRI‐2001, IRI‐2001cor, IRI‐NeQuick, and the default IRI‐COR2. To assess their ability to reproduce the topside profile while minimizing uncertainties associated with F2‐layer peak modeling ...
A. Pignalberi, H. Haralambous, D. Bilitza, P. Coïsson, B. Nava, M. Pezzopane, F. Prol, A. Smirnov, D. R. Themens, C. Xiong   +9 more
wiley   +1 more source

Total Electron Content Measurement Using Digisonde and GNSS

, 2009
The digital pulse ionospheric sounder (Digisonde) of the University of Massachusetts Lowell has been operated in Pruhonice (geographic coordinates 50.0N, 14.6E) since 2004 for ionospheric study.
Kouba, Daniel
core  

Performance Investigation of Four Ionospheric Models in Estimating hmF2 in High‐Latitude Regions

Space Weather, Volume 24, Issue 7, July 2026.
Abstract As a critical parameter characterizing the vertical structure of the ionosphere, the peak height of the F2 layer (hmF2) plays an essential role in frequency selection and signal propagation in high‐frequency (HF) communication systems. Accurate prediction of hmF2 is particularly important in high‐latitude regions.
T. Y. Li, Q. Yu, Y. F. Shi, C. Yang, J. Q. Fan, J. Wang   +5 more
wiley   +1 more source

Digisonde measurement

, 2018
Ionospheric station in Průhonice currently performs its measurements using Digisonda DPS 4D. The vertical profile of the electron concentration can be measured by ionospheric vertical sounding using Ionosonde and Digisonde.
Kouba, Daniel
core