Results 81 to 90 of about 1,720 (206)

A penalized motion detection model for extracting ionospheric echoes from low signal-to-noise ratio Ionogram video images [PDF]

Measuring the altitude distribution of electron density in the upper atmosphere, known as the ionosphere, using HighFrequency radio wave reflections often causes the low signal-to-noise ratio of ionospheric echoes due to radio frequency interference.
Hiroshige, Yuu, 7102932224, Ikeda, Akihiro, Abe, Shuji, Yoshikawa, Akimasa, 藤本, 晶子, 40578803, 0000-0001-9686-6228, 100001151, Fujimoto, Akiko, 25636   +10 more
core   +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

Improving the Automatic Inversion of Digital ISIS-2 Ionogram Reflection Traces into Topside Vertical Electron-Density Profiles [PDF]

, 2011
The topside-sounders on the four satellites of the International Satellites for Ionospheric Studies (ISIS) program were designed as analog systems. The resulting ionograms were displayed on 35-mm film for analysis by visual inspection.
Benson, R. F., Bilitza, D., Wang, Y., Huang, X., Truhlik, V.   +4 more
core  

Ipomoea fistulosa (aguapeí, mandiyurá) intoxication on goats. Effects on hemogram and ionogram [PDF]

, 2005
Ipomoea fistulosa es unaplanta de amplia distribución en el noreste argentino, que causa intoxicaciones en caprinosde cría extensiva. Para evaluar sus efectos sobre algunos parámetros clínicos, el hemogramay el ionograma, se provocó la intoxicación ...
Acosta, Ofelia Cristina, Ciotti, Elsa Mercedes, Bogado, Facundo Ariel, Rodríguez, Carlos Aníbal, Belmonte, C., Ríos, Elvio Eduardo, Ortíz, L.   +6 more
core   +1 more source

Modeling ionograms and critical plasma frequencies with neural networks

Frontiers in Astronomy and Space Sciences
Ionosondes offer broad spatial coverage of the lower ionosphere, supported by a global network of affordable instruments. This motivates the exploration of new methods that exploit this geographical coverage to capture spatially dependent characteristics
Enrique L. Rojas, Jhassmin A. Aricoche, Marco A. Milla   +2 more
doaj   +1 more source

A Frequency Selecting Method for High-Frequency Communication Based on Ionospheric Oblique Backscatter Sounding

Remote Sensing
Ionospheric oblique backscatter sounding is an effective means of monitoring the ionosphere which can be used as a frequency selection system to serve HF communication and ensure its quality and stability. But how to obtain effective information from the
Chuqi Cai, Guobin Yang, Tongxin Liu, Chunhua Jiang   +3 more
doaj   +1 more source

Classification of Ionograms Obtained from Vertical Incidence Pulsed Ionospheric Radar (VIPIR)/Dynasonde Ionospheric Radar at Jang Bogo Station, Antarctica

Journal of Astronomy and Space Sciences
The electron density profiles produced from the ionospheric sounding system are traditionally estimated by the inversion procedure based on the image analysis of the observed ionograms. Jang Bogo Vertical Incidence Pulsed Ionospheric Radar (VIPIR) with
Junho Back, Geonhwa Jee, Hyuck-Jin Kwon, Khan-Hyuk Kim, Changsup Lee, Young-Bae Ham, Nikolay Zabotin   +6 more
doaj   +1 more source

"Hook" structure in MARSIS ionogram and its interpretation

, 2009
MARSIS/MEX is a low frequency radar used to sound the ionosphere of Mars. In general the echo trace associated with reflections in nadir indicates an ionosphere with a main maximum electron density at typically about 130 km altitude, and a monotonously ...
Wang, X.D., Nielsen, E., Wang, J.S., Zou, H., Wang, X., Wang, J.   +5 more
core   +1 more source

Variations in the ionosphere during an aurora substorm as observed by an ionosonde

Antarctic Record, 2008
In order to obtain a better understanding of the influence of precipitating electrons on the ionosphere, we tried to estimate their effect from ionosonde observation data (ionograms) during an aurora substorm.
Joji Watanabe, Mamoru Ishii, Yoshihisa Matsuda   +2 more
doaj   +1 more source

Selective layer-free blood serum ionogram based on ion-specific interactions with a nanotransistor

, 2018
International audienceDespite being ubiquitous in the fields of chemistry and biology, the ion-specific effects of electrolytes pose major challenges for researchers.
Nishiguchi, K., Sivakumarasamy, R., Fujiwara, A., A. Fujiwara, B. Siboulet, Hartkamp, R., R. Sivakumarasamy, K. Nishiguchi, Dufrêche, Jean-François, Clement, N., J.-F. Dufrêche, R. Hartkamp, Siboulet, Bertrand, N. Clément   +13 more
core   +2 more sources