Zobrazeno 1 - 10
of 1 225
pro vyhledávání: '"Ionogram"'
Publikováno v:
Earth and Space Science, Vol 11, Iss 10, Pp n/a-n/a (2024)
Abstract Typical ionosondes operate with >5 min time intervals, which is enough to obtain regular parameters of the ionosphere, but insufficient to observe short‐term processes in the Earth's ionosphere. The key point for this study is to increase
Externí odkaz:
https://doaj.org/article/01473c43816a42168a83c11ac9cecda8
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 2, Pp 93-101 (2024)
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. We use a representation of the recorded signal field in the form of Green function
Externí odkaz:
https://doaj.org/article/b1dd51683a4b4bf0b763b433c0a4e6b1
Autor:
Ponomarchuk S. N., Grozov V. P.
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 2, Pp 102-110 (2024)
The paper presents a method of interpreting data on oblique ionosphere sounding (OS) with a continuous chirp signal. Hybrid algorithms for automatic interpretation of ionograms by selected points with significant amplitude obtained during secondary d
Externí odkaz:
https://doaj.org/article/67860f90272149a093754e39b55754ee
Autor:
Phongsachot Benchawattananon, Apirat Siritaratiwat, Pornchai Supnithi, Michi Nishioka, Septi Perwitasari, Puripong Suthisopapan, Anan Kruesubthaworn
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-14 (2024)
Abstract An ionogram image serves as a valuable data for examining the ionospheric bottom side characteristics and variabilities. Spread-F is indicated or identified by plasma irregularity in the ionospheric region. Diffused echo in the ionogram imag
Externí odkaz:
https://doaj.org/article/b54a60d308f74ee794df9c757203f4d0
Autor:
Andreas Kvammen, Juha Vierinen, Devin Huyghebaert, Theresa Rexer, Andres Spicher, Björn Gustavsson, Jens Floberg
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
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. In this study, we propose the application o
Externí odkaz:
https://doaj.org/article/322febb61e434f2c829e51f01392a4e0
Autor:
Varuliantor Dear, Faruk Afero, Rezy Pradipta, Prayitno Abadi, Mohammad Sigit Arifianto, Iskandar
Publikováno v:
IEEE Access, Vol 12, Pp 124495-124505 (2024)
The Multi-Carrier Modulation (MCM) technique in the Near Vertical Incidence Skywave (NVIS) propagation mode poses a challenge due to the ionosphere’s dynamic behavior. The selection of the main bandwidth and transmission frequency in the MCM-NVIS s
Externí odkaz:
https://doaj.org/article/145d0bd529df455cbcb51bf1229ed960
Publikováno v:
Atmosphere, Vol 15, Iss 7, p 769 (2024)
Publicly available ionograms are often in the form of pictures. This paper proposes a novel algorithm for extracting and repairing the F layer traces from pictorial ionograms. Extensive efforts have been invested in ionogram autoscaling and critical
Externí odkaz:
https://doaj.org/article/f38ffa1c116643f1883618cf0b1498a7
Akademický článek
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Autor:
Gennadiy Zhbankov, Olga Maltseva
Publikováno v:
Proceedings on Engineering Sciences, Vol 5, Iss 1, Pp 97-104 (2023)
In the modern world, the need for accurate knowledge of the state of the high-latitude ionosphere has increased, the modeling of which is difficult due to the presence of a large-scale structure. However, the empirical and theoretical models of the i
Externí odkaz:
https://doaj.org/article/f6c59202c5a54d13ad1dc51e29536f50
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-14 (2022)
Abstract The most important aim in interpreting an oblique ionogram is to obtain the accurate Junction Frequencies (JFs) of the ordinary (O) and extraordinary (X) mode. This requires the correct identification of O- and X-mode traces, so it is very h
Externí odkaz:
https://doaj.org/article/9e355c97b3d5466c9cadfc22f7105ae1