Accès ouvert
2026
article
OpenAlex
Joseph Hughes, L. J. Nickisch, Sergey V. Fridman, Gregory Bullock et autres
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 …
us
(code pays fourni par la source)
2026
conference-paper
OpenAlex
Sergey Fridman, L. J. Nickisch, Kelsey Kramer, Ivan Galkin et autres
We extend altitude coverage of the NWRA assimilative model of the ionosphere called GPSII [1] down into the D-region, to the lower boundary of about 40 km. The model is coupled with the model of neutral atmosphere (NRL MSIS) which makes the …
us
(code pays fourni par la source)
2026
conference-abstract
OpenAlex
Matthew Hogan, Kelsey Kramer, S. Kraut, Sergey Fridman et autres
We present real-time ionospheric state estimation results using an oblique ionogram trace extractor. The developed software named the Automated Point Extractor (APEx) performs automatic trace extraction and returns a representative sampling of frequency-delay pairs, mode identification, and uncertainties.
us
(code pays fourni par la source)
2026
conference-abstract
OpenAlex
J. Hughes, N. Zabotin, L. J. Nickisch, L. Zabotina et autres
Since the ionosphere is always characterized by a broad spectrum of irregularities (from km-scale to TIDs) physics of the ionospheric response to a signal of HF sounding at any time and at any base frequency involves multiple reflection points. The Dynasonde technique …
us
(code pays fourni par la source)
2026
conference-abstract
OpenAlex
P. M. Franke, Erich Becker, L. J. Nickisch
The composition, structure, and dynamics of the lower thermosphere (E- and F-region) has been of interest since the early days of radio communication. Bouncing HF signals off the ionosphere in the F-region ($300-400$ km) allowed long-range communication. Traveling ionospheric disturbances (TIDs) were …
us
(code pays fourni par la source)
2025
conference-abstract
OpenAlex
N. A. Zabotin, Liudmila Zabotina, L. J. Nickisch
We present a novel imaging approach in studies of the spatiotemporal dynamics of Es events based on Wallops Island Dynasonde data. This may be named a Dynasonde-specific implementation of a “sky maps” technique focused on sporadic E layer and leaving regular E …
us
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Kiran Jain, C. Lindsey, E. Adamson, C. N. Arge et autres
Whitepaper #189 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/projects; solar physics; […]
us, es
(code pays fourni par la source)
Accès ouvert
2023
conference-paper
OpenAlex
Sergey V. Fridman, L. J. Nickisch, M. A. Hausman, Joseph Malins
Accès ouvert
2022
preprint
OpenAlex
Kiran Jain, C. Lindsey, E. Adamson, C. N. Arge et autres
The purpose of this white paper is to put together a coherent vision for the role of helioseismic monitoring of magnetic activity in the Sun's far hemisphere that will contribute to improving space weather forecasting as well as fundamental research in the …
Accès ouvert
2022
article
OpenAlex
Michael Negale, J. V. Eccles, Jeffery M. Holmes, Sergey V. Fridman et autres
Qaanaaq imager data supporting the paper entitled Modeling polar cap airglow patch intensities using three-dimensional ionospheres produced by data assimilations.
no, us
(code pays fourni par la source)
Accès ouvert
2022
dataset
OpenAlex
Michael Negale, J. V. Eccles, Jeffery M. Holmes, Sergey V. Fridman et autres
Qaanaaq imager data supporting the paper entitled Modeling polar cap airglow patch intensities using three-dimensional ionospheres produced by data assimilations.
no, us
(code pays fourni par la source)
2021
book-chapter
OpenAlex
L. J. Nickisch, Jules Mollere
us
(code pays fourni par la source)