Results 71 to 80 of about 1,720 (206)
Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.Abstract We investigated characteristics of post‐sunset equatorial plasma bubbles (EPBs) generated over Indonesia during a geomagnetic storm on 12 August 2024 using Global Navigation Satellite System and ionosonde data. During the August geomagnetic storm, EPBs were generated after sunset over the eastern part of Indonesia (∼120°–130°E) but not over ...
Takuya Sori +11 more
wiley +1 more source
A study of the ionogram derived effective scale height around the ionospheric hmF2 [PDF]
, 2006 International audienceThe diurnal, seasonal, and solar activity variations of the ionogram derived scale height around the ionospheric F-layer peak (Hm) are statistically analyzed at Wuhan (114.4° E, 30.6° N) and the yearly variations of Hm are also ...
L. Liu +5 more
core +3 more sources
HF radio path modeling by waveguide approach
Solar-Terrestrial PhysicsWe 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.
Ponomarchuk S. N. +3 more
doaj +1 more source
How the 29 July 2025 M8.8 Kamchatka Earthquake Shook the Ionosphere Over Japan
Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.Abstract This study investigates the mid‐field (∼1,100–3,800 km) ionospheric response to the 29 July 2025 Kamchatka earthquake over Japan using multi‐instrument observations, raytracing, and numerical simulations. Total electron content (TEC) observations from GPS satellite G04 and Galileo satellite E10 show a maximum TEC perturbation of ∼0.5–0.85 TECU
R. K. Barad +5 more
wiley +1 more source
Pemodelan Ionogram Menggunakan Metode Spline Kubik
, 2011 Ionosfer is a part of the earth atmosfer is an influnced layer at radio wave web which is now become an interesting topic at communication system. Some efforts were done by moddeling action from ionosfer layer variability as a time function, location ...
Slamet Syamsudin
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Automatic interpretation of oblique sounding ionograms based on hybrid algorithms
Solar-Terrestrial PhysicsThe 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 data ...
Ponomarchuk S. N., Grozov V. P.
doaj +1 more source
Quantifying Errors in the Midpoint Transform Applied to Oblique Ionograms
Radio Science, Volume 61, Issue 7, July 2026.Abstract It is important to specify the state of the ionosphere for Over‐the‐Horizon communications and surveillance. Both vertical and oblique ionograms provide valuable data to this end. Oblique ionograms can probe the ionosphere in locations where it would be impractical to build a vertical ionosonde, but their measurements are not straightforward ...
Joe Hughes +6 more
wiley +1 more source
, 1974 203-206A method is presented for ray tracing from electron density information provided by a vertical ionogram. Making use of the same electron density profile shape for true height conversion of the ionogram and for the ray path parameter computation ...
Rao, N. Narayana
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Space Weather, Volume 24, Issue 7, July 2026.Abstract For decades, two competing hypotheses on the key drivers of mid‐latitude long‐duration positive ionospheric storms (LDPS) have been considered: (a) an increase of the F2‐layer peak height (hmF2) and (b) an increase in the atomic oxygen to molecular nitrogen density ratio (O/N2).
D. V. Kotov +15 more
wiley +1 more source
Studies in ionogram analysis and interpretation
, 1975 The single-polynomial method for ionogram analysis is adapted to give a least-squares procedure in which the number of scaled virtual heights is greater than the number of terms in the real-height polynomial.
Lobb, R. J. (Richard J.)
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