Results 71 to 80 of about 1,756 (218)

On the Generation of Pre‐Sunrise Equatorial Plasma Bubbles in Southeast Asia During the Geomagnetic Storm of May 2024

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract A set of fresh Equatorial Plasma Bubbles (EPBs) formed during pre‐sunrise hours in the Southeast Asian sector amid the recovery phase of May 2024 geomagnetic storm. They offered new insights into their formation mechanism. This study used Total Electron Content (TEC) and Rate of TEC Index maps over Indonesia, along with ionosondes in Thailand ...
Sri Ekawati, Prayitno Abadi, Takuya Sori, Rezy Pradipta, Ihsan Naufal Muafiry, Teguh Nugraha Pratama, Agri Faturahman, Noersomadi, Febrylian Fahmi Chabibi, Punyawi Jamjareegulgarn   +9 more
wiley   +1 more source

Oblique ionograms automatic scaling and eikonal based ray tracing [PDF]

, 2015
A method for automatic scaling of oblique ionograms has been introduced. This method also provides a rejection procedure for ionograms that are considered to lack sufficient information, depicting a very good success rate.
Ippolito, Alessandro <1977>
core   +1 more source

Signal Data Stream Parameters Passing Ionospheric Communication Links With Fading Caused by Natural Clutter Phenomena

Radio Science, Volume 61, Issue 8, August 2026.
Abstract This paper explores the impact of natural phenomena on signal data transmission across various ionospheric communication channels. The study focuses on three primary phenomena: meteor trails prevalent in the middle‐ and lower‐latitude ionosphere, bubble and plume structures observed around the equatorial ionosphere, and magnetic‐storm‐induced ...
I. Bronfman, Y. Ben‐Shimol, N. Blaunstein   +2 more
wiley   +1 more source

Ionogram inversion for a tilted ionosphere

, 1990
Digital ionosondes such as the Dynasonde disclose that the ionosphere is seldom horizontal even when it is plane stratified to a good approximation. The local magnetic dip does not then determine correctly the radiowave propagation angle for inversion of
Wright, J.W., J. W. Wright
core   +1 more source

Peculiar Magnetosphere‐Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The auroral‐like sporadic E‐layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing questions regarding the physical processes responsible for the substantial ...
Lígia A. Da Silva, Hui Li, Laysa C. A. Resende, Vânia F. Andrioli, Angela M. Santos, Juliano Moro, Paulo R. Jauer, Luis Eduardo Vieira, Lívia R. Alves, José Paulo Marchezi, Jiankui Shi, Jiyao Xu, Paulo P. Batista, Jose V. Bageston, Yajun Zhu, Clezio M. Denardini, Chi Wang, Ezequiel Echer, Guotao Yang, Alexandre A. Pimenta, Joaquim R. Costa, Zhengkuan Liu   +21 more
wiley   +1 more source

NOIRE-Net–a convolutional neural network for automatic classification and scaling of high-latitude ionograms

Frontiers in Astronomy and Space Sciences
Millions of ionograms are acquired annually to monitor the ionosphere. The accumulated data contain untapped information from a range of locations, multiple solar cycles, and various geomagnetic conditions.
Andreas Kvammen, Juha Vierinen, Juha Vierinen, Devin Huyghebaert, Theresa Rexer, Andres Spicher, Björn Gustavsson, Jens Floberg   +7 more
doaj   +1 more source

Radio‐Quiet Ionosonde Observations for Monitoring Absorption in the HF Band

Radio Science, Volume 61, Issue 8, August 2026.
Abstract This work presents a technique to monitor ionospheric absorption in the HF radio band using ionosondes. For this purpose, the ionosondes were run in a radio‐silent mode, recording not reflections of their own emitted signals but oblique signals from transmitters of opportunity.
T. G. W. Verhulst, A. Buzás, D. Altadill, A. Segarra, V. de Paula, V. Barta   +5 more
wiley   +1 more source

Pemodelan Ionogram Menggunakan Metode Spline Kubik

, 2011
Ionosfer is a part of the earth atmosfer is an influnced layer at radio wave web which is now become an interesting topic at communication system. Some efforts were done by moddeling action from ionosfer layer variability as a time function, location ...
Slamet Syamsudin
core  

HF radio path modeling by waveguide approach

Solar-Terrestrial Physics
We present a scheme for modeling HF radio signal characteristics along paths of different lengths, which is based on the waveguide approach — the normal mode method.
Ponomarchuk S. N., Kurkin V. I., Ilyin N. V., Penzin M. S.   +3 more
doaj   +1 more source

PyRayHF: An Open Source Ray‐Tracing Forward Operator for Assimilating Oblique Ionograms

Radio Science, Volume 61, Issue 8, August 2026.
Abstract Oblique high‐frequency (HF) ionospheric measurements contain valuable information about electron density structure, but remain difficult to assimilate operationally due to the computational cost of ray tracing. PyRayHF is an open‐source, fully Python‐based framework that addresses such difficulties through the implementation of efficient ...
Victoriya V. Forsythe, Henry C. Valentine, Douglas P. Drob, Joseph Hughes, Dustin Hickey, Angeline G. Burrell, Katherine A. Zawdie, Dev Raj Joshi, William Bristow, Evan G. Thomas   +9 more
wiley   +1 more source