Results 71 to 80 of about 77,336 (163)

The Reliability of HF Propagation Links Over Canada During Absorption Events

Space Weather, Volume 24, Issue 10, October 2026.
Abstract Natural Resources Canada monitors space weather impacts to high frequency radio wave propagation using several High Frequency transmitter/receiver links across Canada. HF data received in Alert from a transmitter in Ottawa are examined in this study.
R. G. Gillies, E. Spanswick, R. Fiori, F. Ghaly, T. Cameron, S. Skone   +5 more
wiley   +1 more source

Impact of Two Radio Occultation Constellations on Numerical Weather Prediction: Polar‐Orbits Only and Mixed Polar‐Equatorial Orbits

Earth and Space Science, Volume 13, Issue 10, October 2026.
Abstract This study explores the relative impact of two orbital configurations for Global Navigation Satellite System radio occultation (RO) observations in numerical weather prediction using observing system simulation experiments (OSSE). Three experiments are carried out: a Control experiment with no RO observations and two experiments with 14,000 RO
Nikki C. Privé, Christopher Barsoum, Douglas Hunt, Michael J. Murphy, Richard Anthes, William Gullotta, Natalie Laudier   +6 more
wiley   +1 more source

Equatorial F‐Region Responses to the Main Phase of the 10 May 2024 Geomagnetic Storm Over the South American Sector: Observations and Model Simulations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study examines the equatorial ionospheric response over the South American sector during the onset of the extreme 2024 Mother's Day geomagnetic storm, which began at ∼17 UT on 10 May and reached the G5 level. Pronounced disturbances in ionospheric electrodynamics were observed under both daytime and nighttime conditions. Variations in the
A. M. Santos, J. R. Souza, I. S. Batista, M. Bravo, C. G. M. Brum, J. H. A. Sobral, S. S. Chen, R. Sá, L. C. A. Resende, J. Moro, P. R. Jauer, L. da Silva, D. Medeiros, P. A. B. Nogueira, E. A. Kherani, V. F. Andrioli, M. A. Abdu, G. S. Adeniran, R. de Jesus, A. A. Pimenta, G. Yang, F. A. de Souza   +21 more
wiley   +1 more source

Effect of Lower Ionosphere on the Propagation of VLP Waves at Low Latitudes [PDF]

, 1980
101-104Full wave technique is employed to determine the Budden's reflection coefficients and polarization for VLF waves of frequency 5 kHz propagating in the lower region of the ionosphere at low latitudes.
Singh, D P, Singh, Birbal
core  

Correlation between cosmic noise absorption and VHF coherent echo intensity [PDF]

, 2005
International audienceWe present examples and statistical analysis of the events with statistically significant correlation between the cosmic noise absorption (CNA) and the signal-to-noise ratio (SNR) of the VHF coherent echo intensity in the area ...
Makarevitch, R.A., Makarevitch, R. A., F. Honary, Honary, F., R. A. Makarevitch   +4 more
core   +1 more source

The large lookup-table codes for nighttime ionospheric retrieval

, 2023
These codes contain the large lookup tables described in (Qin et al., 2023): Inferring the ionospheric state with the far ultraviolet imager on the Fengyun-4C geostationary satellite: Retrieval algorithm and ...
openaire   +2 more sources

Nighttime ionospheric enhancements induced by the occurrence of an evening solar eclipse [PDF]

Journal of Geophysical Research: Space Physics, 2013
AbstractThe solar eclipse on 15 January 2010 traversed Asia and completed its travel on the Shandong Peninsula in China at sunset. Two vertical incidence ionosondes at Wuhan and Beijing and the oblique incidence ionosonde network in North China were implemented to record the ionospheric response to the solar eclipse.
Gang Chen, Hao Qi, Baiqi Ning, Zhengyu Zhao, Ming Yao, Zhongxing Deng, Ting Li, Shuo Huang, Wenchao Feng, Jianhua Wu, Chen Wu   +10 more
openaire   +1 more source

The nighttime ionospheric response and occurrence of equatorial plasma irregularities during geomagnetic storms: a case study

Satellite Navigation, 2021
Recent studies revealed that the long-lasting daytime ionospheric enhancements of Total Electron Content (TEC) were sometimes observed in the Asian sector during the recovery phase of geomagnetic storms (e.g., Lei (J Geophys Res Space Phys 123: 3217–3232,
Xin Wan, Chao Xiong, Shunzu Gao, Fuqing Huang, Yiwen Liu, Ercha Aa, Fan Yin, Hongtao Cai   +7 more
doaj   +1 more source

Statistical Analysis of the Equatorward UV Auroral Emissions of the Jovian Southern Hemisphere

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study presents a comprehensive statistical analysis of Jupiter's southern UV auroral emissions, with a focus on the secondary oval and equatorward injection signatures. Utilizing Hubble Space Telescope (HST) data, the frequency, location, and intensity of these auroral features are systematically evaluated, considering their variation ...
Diego Moral‐Pombo, Sarah V. Badman, Licia C. Ray   +2 more
wiley   +1 more source

The nighttime ionosphere of Mars from Mars-4 and Mars-5 radio occultation dual-frequency measurements [PDF]

, 1976
Dual frequency radio sounding of the Martian nighttime ionosphere was carried out during the exits from behind the planet of the Mars-4 spacecraft on February 2, 1974 and the Mars-5 spacecraft on February 18, 1974.
Savich, N. A., Samovol, V. A., Vyshlov, A. S., Sidorenko, A. I., Samoznaev, L. N., Shtern, D. Y., Vasilyev, M. B.   +6 more
core