Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Haris, Haralambous"'
Publikováno v:
Applied Sciences, Vol 14, Iss 12, p 5075 (2024)
This paper presents the design, development, and performance evaluation of a compact wideband phased array active helical antenna for monitoring HF interference. Traditional multi-element HF antenna designs are often subjected to size restrictions. T
Externí odkaz:
https://doaj.org/article/c646c125b5ea4533aa653710d6d81ed3
Autor:
Christina Oikonomou, Theodoros Leontiou, Haris Haralambous, Tamara L. Gulyaeva, V. A. Panchenko
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-16 (2023)
Abstract Nine years of ionograms from a higher mid-latitude ionospheric station (Moscow) are analyzed, by applying the ‘height–time–intensity’ (HTI) technique along with Spectrum (Lomb periodogram) analysis with the aim to investigate the dai
Externí odkaz:
https://doaj.org/article/a5918a27c46a412ba60dfce7f14044d5
Autor:
Michael Pezzopane, Alessio Pignalberi, Marco Pietrella, Haris Haralambous, Fabricio Prol, Bruno Nava, Artem Smirnov, Chao Xiong
Publikováno v:
Atmosphere, Vol 15, Iss 4, p 498 (2024)
A new analytical formula for H0, one of the three parameters (H0, g, and r) on which the NeQuick model is based to describe the altitude profile of the electron density above the F2-layer peak height hmF2, has recently been proposed. This new analyti
Externí odkaz:
https://doaj.org/article/802e97b3f17d46ca81096c87f8d486e5
Publikováno v:
Atmosphere, Vol 15, Iss 3, p 331 (2024)
One of the most popular indices for monitoring the occurrence and intensity of ionospheric L-band irregularities is the Rate of TEC Index (ROTI). Due to low TEC in the mid-latitude ionosphere, ROTI has received significantly less attention than the e
Externí odkaz:
https://doaj.org/article/62e07fed09ac46e8856167130e8d235a
Autor:
Christos Giannaros, Elissavet Galanaki, Vassiliki Kotroni, Konstantinos Lagouvardos, Christina Oikonomou, Haris Haralambous, Theodore M. Giannaros
Publikováno v:
Forecasting, Vol 3, Iss 2, Pp 437-446 (2021)
The Southeast Mediterranean (SEM) is characterized by increased vulnerability to river/stream flooding. However, impact-oriented, operational fluvial flood forecasting is far away from maturity in the region. The current paper presents the first atte
Externí odkaz:
https://doaj.org/article/46f5ff5fa86641ed904ded7aa3dd8db8
Autor:
Alessio Pignalberi, Michael Pezzopane, David R. Themens, Haris Haralambous, Bruno Nava, Pierdavide Coisson
Publikováno v:
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 1867-1878 (2020)
The analytical description of the topside ionosphere included in the NeQuick model is studied in detail. First, the modeled scale height behavior is analyzed at infinity and for the lowest part of the topside region; in the latter case, the analysis
Externí odkaz:
https://doaj.org/article/400412319850499287337f2b10d06e64
Publikováno v:
Remote Sensing, Vol 15, Iss 5, p 1344 (2023)
Using the topside electron density (Ne) measurements recorded over Cyprus and Russia, we investigate the latitudinal variation in the topside electron density during the interval 2014–2020, encompassing a period of high-to-low solar activity. The s
Externí odkaz:
https://doaj.org/article/830e933bcc9548bbad14c0e7e5e40383
Publikováno v:
Remote Sensing, Vol 15, Iss 4, p 897 (2023)
We demonstrate a simple method to estimate the direction of propagation of travelling ionospheric disturbances using in-situ electron density measurements in the topside ionosphere by exploiting the side-by-side flying configuration of Swarm A and C
Externí odkaz:
https://doaj.org/article/48c0038455a04adca49324cb01209a7e
Publikováno v:
Remote Sensing, Vol 14, Iss 23, p 6040 (2022)
Due to the long distance propagation characteristics of the HF spectrum, noise and interference are significant and challenging factors that have to be addressed in the context of HF system performance. Both aspects exhibit systematic diurnal, season
Externí odkaz:
https://doaj.org/article/3f766cc9333b4f34a9714dbd0fa42b39
Publikováno v:
Applied Sciences, Vol 12, Iss 22, p 11808 (2022)
Interference from other users, due to the long-distance propagation of HF signals, causes spectral congestion, which is considered a primary detrimental effect on HF (3–30 MHz) communication systems. More than a year of HF electric field measuremen
Externí odkaz:
https://doaj.org/article/18b93d6ae6e940be8c2b23398b9612c1