Results 51 to 60 of about 4,167 (217)

Interpreting Observations of Large‐Scale Traveling Ionospheric Disturbances by Ionospheric Sounders [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractFrom July to October 2015, the Australian Defence Science and Technology Group conducted an experiment during which a vertical incidence sounder (VIS) was set up at Alice Springs Airport. During September 2015 this VIS observed the passage of many large‐scale traveling ionospheric disturbances (TIDs).
L. H. Pederick, M. A. Cervera, T. J. Harris   +2 more
openaire   +1 more source

First Quantitative Results on the Response of Green and Red Line Dayglow Emissions to Solar Flares of Different Magnitudes

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Flares originate from the impulsive release of magnetic energy in the solar atmosphere. The rise in X‐ray flux enhances ionization/electron content in the upper atmosphere, modifying the photochemical and dynamical processes that govern the ionosphere‐thermosphere behavior.
Komal, Duggirala Pallamraju
wiley   +1 more source

Investigation of Large Scale Traveling Atmospheric/Ionospheric Disturbances Using the Coupled SAMI3 and GITM Models

Geophysical Research Letters
We present simulation results of the vertical structure of Large Scale Traveling Ionospheric Disturbances (LSTIDs) during synthetic geomagnetic storms.
A. Bukowski, A. Ridley, J. D. Huba, C. Valladares, P. C. Anderson   +4 more
doaj   +1 more source

Climatology of Mid-latitude Ionospheric Disturbances from the Very Large Array Low-frequency Sky Survey

, 2012
The results of a climatological study of ionospheric disturbances derived from observations of cosmic sources from the Very Large Array (VLA) Low-frequency Sky Survey (VLSS) are presented.
Borries, Cohen, Cohen, Condon, Cornwell, Cosgrove, Cosgrove, Cotton, Dymond, Foster, Helmboldt, Helmboldt, Helmboldt, Hernández-Parajes, Hoogeveen, J. F. Helmboldt, Jacobson, Jacobson, Kassim, Kelley, Kolmogorov, Kolmogorov, Lane, Perkins, Rengelink, Shiokawa, Tatarski, Tsugawa, Vadas, W. D. Cotton, W. M. Lane, Yokoyama   +31 more
core   +1 more source

Topside Refractive Irregularities and Travelling Ionospheric Disturbances [PDF]

Australian Journal of Physics, 1967
Munro (1950) deduced from ground-based observations that traveling ionospheric disturbances (T.LD.'s) are large-scale distortions of the electron density contours, which travel through the ionosphere, and Calvert and Schmid (1964) attributed extra traces and distortions of the main echo traces, which occur near the critical frequency of topside ...
openaire   +1 more source

Impact of Non‐Classical Gravity‐Wave Dynamics on Middle‐Atmosphere Mean Flow and Solar Tides

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 8, 28 April 2026.
Abstract Conventional gravity‐wave (GW) parameterizations neglect three aspects of GW dynamics. Instead of momentum and entropy fluxes they use Eliassen‐Palm fluxes, thereby neglecting the possibility that resolved flow are not in geostrophic and hydrostatic balance.
T. Kühner, G. S. Völker, U. Achatz
wiley   +1 more source

Incoherent scatter radar observations of AGW/TID events generated by the moving solar terminator [PDF]

Annales Geophysicae, 1998
Observations of traveling ionospheric disturbances (TIDs) associated with atmospheric gravity waves (AGWs) generated by the moving solar terminator have been made with the Millstone Hill incoherent scatter radar.
V. G. Galushko, V. V. Paznukhov, Y. M. Yampolski, J. C. Foster   +3 more
doaj   +1 more source

Detecting ionospheric TEC perturbations caused by natural hazards using a global network of GPS receivers: The Tohoku case study [PDF]

, 2012
Recent advances in GPS data processing have demonstrated that ground-based GPS receivers are capable of detecting ionospheric TEC perturbations caused by surface-generated Rayleigh, acoustic and gravity waves.
A. J. Mannucci, A. Komjathy, B. Wilson, D. A. Galvan, M. D. Butala, M. Hickey, O. Verkhoglyadova, P. Stephens, V. Akopian   +8 more
core   +2 more sources

Comparison of travelling ionospheric disturbance measurements with thermosphere/ionosphere model results [PDF]

Annales Geophysicae, 2003
Abstract. Comparisons of modeled and measured responses of the ionosphere to the passage of atmospheric gravity waves are made for data recorded by an ionosonde located at Almaty (76°55' E, 43°15' N) from June 2000 until May 2001. Temporal variations of the altitude (hmF) and electron content (NmF) of the F-layer peak are used for comparisons.
Ashkaliev, Ya. F., Gordienko, G. I., Jacobi, Ch., Litvinov, Yu. G., Vodyannikov, V. V., Yakovets, A. F.   +5 more
openaire   +4 more sources

Do Eclipse‐Induced Thermospheric TADs Originate From Above or Below?

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Solar eclipses generate significant wave activity in the Earth's upper atmosphere. The source region of eclipse‐induced Traveling Atmospheric Disturbances (TADs) in the upper thermosphere—particularly the relative contributions of gravity waves from the thermosphere itself versus the lower atmosphere—remains unknown. Using the Whole Atmosphere
Yu Jiao, Jing Liu, Shuhan Li, Joseph M. McInerney, Jianyong Li, Yuyan Yang   +5 more
wiley   +1 more source