Results 31 to 40 of about 1,756 (218)
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 +2 more
doaj +1 more source
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 +7 more
doaj +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 +3 more
core +1 more source
Can the polarization tagging of the ionogram trace deceive autoscaling methods? The Learmonth case [PDF]
, 2008 This paper focuses on the problem of invalid O/X polarization tagging of an ionogram and how this can affect ionogram autoscaling methods. To illustrate this problem, 623 ionograms recorded in March and April 2004 (days 080-105) by the digisonde 256 ...
Scotto, C., Pezzopane, M.
core +2 more sources
Frontiers in Astronomy and Space SciencesVertical 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 +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
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 +3 more
doaj +1 more source
Global Ionospheric Responses to Four X‐Class Solar Flares in November 2025
Space Weather, Volume 24, Issue 11, November 2026.Abstract We investigate global ionospheric responses to four X‐class solar‐disk flares that occurred in November 2025 from the same solar active region, using multi‐instrument observations including GNSS, ionosonde, geomagnetic and GOES solar irradiance data. Pronounced dayside TEC enhancements are observed for three flares (#2 X1.2, #3 X5.1, and #4 X4.
Lei Liu, Shasha Zou
wiley +1 more source
IEEE AccessThe 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 +5 more
doaj +1 more source
The effect of collisions in ionogram inversion [PDF]
Advances in Space Research, 2013 14 pages, 4 ...
Scotto, Carlo, Settimi, Alessandro
openaire +2 more sources