Results 31 to 40 of about 1,552 (215)

New Chung-Li Ionosonde in Taiwan: System Description and Preliminary Results

Remote Sensing, 2022
In spite of being interrupted several times in its long history of operation since 1950, the routine observation of the ionosphere with various ionosondes installed at the Chung-Li ionosphere station in Taiwan has been achieved successively for more than
Kai-Jun Ke, Ching-Lun Su, Ruey-Ming Kuong, Hsyang-Chan Chen, Hung-Shi Lin, Po-Hsun Chiu, Ching-Yuan Ko, Yen-Hsyang Chu   +7 more
doaj   +1 more source

Global response of Magnetic field and Ionosonde observations to intense solar flares on 6 and 10 September 2017

E3S Web of Conferences, 2018
Intense X-ray fluxes during solar flares are known to cause enhanced ionization in the Earth’s ionospheric D, E and F region. This sudden change of ionospheric electron density profile is serious problem to radio wave communication and navigation system.
Fujimoto Akiko, Yoshikawa Akimasa, Ikeda Akihiro   +2 more
doaj   +1 more source

Variability of Weddell Sea ionospheric anomaly as deduced from observations at the Akademik Vernadsky station

Український антарктичний журнал, 2021
Ionospheric Weddell Sea anomaly is an inversion of diurnal variation of the electron density in the ionosphere over Antarctic Peninsula, Weddell Sea, and neighbor territories observed during Antarctic summer.
A. Zalizovski, I. Stanislawska, V. Lisachenko, O. Charkina   +3 more
doaj   +1 more source

A study of O/X wave data assimilation and inversion for ionospheric vertical electron density profiles

Frontiers in Astronomy and Space Sciences
Vertical sounding of the ionosphere yields ionograms that reflects the relationship between virtual height and frequency, and electron density profiles can be obtained by inversion of the ionogram.
Longlong Niu, Chen Zhou, Na Wei, Zhong-Xin Deng, Yun Ning, Rong Chen, Wen Liu   +6 more
doaj   +1 more source

Manual Scaling of Ionograms Measured at Jeju (33.4°N, 126.3°E)

Journal of Astronomy and Space Sciences, 2018
The ionosphere has been monitored by ionosondes for over five decades since the 1960s in Korea. An ionosonde typically produces an ionogram that displays radio echoes in the frequency-range plane.
Yong Ha Kim, Ki-nam Kim
doaj   +1 more source

Frequency Window With Homogeneous Time of Flight (ToF) for Near Vertical Incidence Skywave (NVIS) Propagation Determined Based on Ionograms

IEEE Access
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.
Varuliantor Dear, Faruk Afero, Rezy Pradipta, Prayitno Abadi, Mohammad Sigit Arifianto, Iskandar   +5 more
doaj   +1 more source

Space Weather Effects From Moderate to Severe Geomagnetic Storms in October 2024 Over the Latin American Sector

Space Weather, Volume 24, Issue 6, June 2026.
Abstract This study presents a detailed case study of the ionospheric impacts of moderate (G2) and severe (G4) geomagnetic storms over the Latin American sector, with particular emphasis on the formation and suppression of equatorial plasma bubbles (EPBs).
C. S. Carmo, L. Dai, C. M. Wrasse, D. Barros, H. Takahashi, J. R. Costa, L. F. R. Vital, P. R. Jauer, C. De La Jara, A. J. Carrasco, C. A. O. B. Figueiredo, C. Wang, H. Li, Z. Liu   +13 more
wiley   +1 more source

A Reduced Dimensional Emulator for Forecasting Equatorial Spread F

Space Weather, Volume 24, Issue 6, June 2026.
Abstract A machine learning emulator has been developed to efficiently reproduce electron densities from a three‐dimensional, data‐driven, regional simulation of postsunset ionospheric irregularities associated with equatorial spread F (ESF). The simulation has previously been shown to produce accurate ESF conditions observed at the Jicamarca Radio ...
A. Kirchman, D. L. Hysell, S. Palacios
wiley   +1 more source

Ionogram generation in HF band by using three dimensional ray tracing

, 2017
In this study, combination of three-dimensional ray tracing and electron density estimator IRI (International Reference Ionosphere) is used to obtain the ionosonde output, ionogram.
Kabasakal, Mehmet, TOKER, CENK, Mehmet Kabasakal, Cenk Toker   +3 more
core   +1 more source

Observations of ionospheric disturbances via U-shaped traces on ionograms

Геодинамика и тектонофизика, 2019
The ionospheric vertical sounding is a basic technique for studying the Earth’s ionosphere. Taking into account the fact that conditions for propagation of radio waves depend on the operating frequency, diagnostics of the ionosphere is performed using ...
O. A. Laryunin
doaj   +1 more source