Results 81 to 90 of about 47,066 (211)

Variation of Venusian Gravity Wave Absolute Momentum Fluxes and Drag as Retrieved From the Akatsuki Mission

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract Using temperature retrievals from Akatsuki radio occultation measurements, we characterize gravity wave activity as a function of vertical wavenumber and altitude. For the first time, we estimate the absolute horizontal momentum fluxes and the magnitude of the gravity wave drag (i.e., wave acceleration), assuming a horizontal wavelength of 300 
Erdal Yiğit, Emilia Sloan
wiley   +1 more source

Interplanetary magnetic field and its possible effects on the mid-latitude ionosphere II

Annals of Geophysics, 1994
Using criticaI frequencies, f0F2 from the Uppsala, Lannion and Dourbes ionosonde stations, the possible effects of the orientation of the IMF on mid-latitude ionosphere are further investigated.
Y. Tulunay
doaj   +1 more source

First observations of the midlatitude evening anomaly using Super Dual Auroral Radar Network (SuperDARN) radars

, 2011
[1] Under geomagnetically quiet conditions, the daytime midlatitude ionosphere is mainly influenced by solar radiation: typically, electron densities in the ionosphere peak around solar noon.
M. Lester (7589660), J. B. H. Baker (7594046), N. R. Varrier (7603277), de Larquier S. (7603274), J. M. Ruohoniemi (7594043)   +4 more
core   +4 more sources

Winter Anomaly of the Lower Ionosphere and Its Possible Causes [PDF]

, 1984
It is a well-known fact that in winter the midlatitude lower ionosphere differs considerably from that in summer. Attempts to explain the possible causes of the winter anomaly in the lower ionosphere were made.
Rapoport, Z. T.
core  

Midlatitude propagation of VLF to MF waves through nighttime ionosphere above powerful VLF transmitters

, 2013
International audience[1] Midlatitude nighttime observations made by the DEMETER satellite in the very low frequency (VLF) to medium frequency (MF) bands (3 kHz to 3 MHz) have demonstrated the propagation of radio waves from the bottom of ionosphere up ...
Pinçon, Jean-Louis, M. Parrot, F. Lefeuvre, Parrot, Michel, Lefeuvre, François, J. L. Pinçon   +5 more
core   +1 more source

Dependence of the F2-layer critical frequency median at midlatitudes on geomagnetic activity

Solar-Terrestrial Physics, 2017
We put forward a method of separating the geomagnetic activity contribution to the F2-layer critical frequency median, foF2med, at middle latitudes. It is based on the analysis of foF2, which is the ratio foF2med/foF2q in percent, where foF2q is the F2 ...
Deminov M.G., Deminova G.F., Depuev V.Kh., Depueva A.Kh.   +3 more
doaj   +1 more source

Midlatitude model of the electron density gradient in the lower ionosphere [PDF]

, 2002
A model of the spectrum of the electron density turbulent fluctuations in the Earth's midlatitude lower ionosphere has been developed. The model covers the whole spectrum of turbulent irregularity scales and takes into account a set of geophysical ...
Khoutorova O., Zhuravlev A., Teptin G.
core  

Subauroral and Auroral Conditions in the Mid- and Low-Midlatitude Ionosphere over Europe During the May 2024 Mother’s Day Superstorm

Remote Sensing
This study focuses on the mid- and low-midlatitude ionospheric response to the 2024 Mother’s Day superstorm, utilizing ground-based and Swarm satellite observations.
Kitti Alexandra Berényi, Veronika Barta, Csilla Szárnya, Attila Buzás, Balázs Heilig   +4 more
doaj   +1 more source

A year long comparison of GPS TEC and global ionosphere-thermosphere models [PDF]

, 2018
The prevalence of GPS total electron content (TEC) observations has provided an opportunity for extensive global ionosphere‐thermosphere model validation efforts.
Cnossen, I., Ridley, A.J., Perlongo, N.J., N. J. Perlongo, A. J. Ridley, C. Wu, Perlongo, N. J., Wu, C., I. Cnossen, Ridley, A. J.   +9 more
core   +1 more source

Anomalous Ionogram Traces over European Mid-Latitudes: Climatology and Association with Travelling Ionospheric Disturbances

Atmosphere
Anomalous ionogram traces are characteristic ionogram signatures, appearing as split, branching, cusp, U-, sickle-, and crescent-shaped structures in the F-region trace, that are commonly associated with travelling ionospheric disturbances (TIDs) and TID-
Blessy Varghese, Krishnendu Sekhar Paul, Ankitha Nandakumar, Ola Abu Elezz, Haris Haralambous, Tiju Joseph Mathew   +5 more
doaj   +1 more source