Results 141 to 150 of about 373,009 (204)

Modeling of Three‐Dimensional Structure and Dynamics of the Large‐Scale Sporadic E Layers Over East Asia

Journal of Geophysical Research: Space Physics
Sporadic E (Es) layers are thin layers of concentrated metallic ions in the mesosphere and lower thermosphere region. Their occurrence can cause the uneven distribution of plasma density and affects the performance of the Global Navigation Satellite ...
Liuhui Qiu, Huixin Liu
semanticscholar   +1 more source

On the necessity of using foμEs instead of foEs in estimating the intensity and variability of sporadic E layers

Journal of Atmospheric and Solar-Terrestrial Physics, 2020
The ordinary wave critical frequency foEs is measured routinely by ionosondes and used widely in estimating the intensity and occurrence of sporadic E (Es) metal ion layers.
C. Haldoupis, H. Haralambous, Chris Meek
semanticscholar   +1 more source

Lightning-induced intensification of the ionospheric sporadic E layer

Nature, 2005
A connection between thunderstorms and the ionosphere has been hypothesized since the mid-1920s. Several mechanisms have been proposed to explain this connection, and evidence from modelling as well as various types of measurements demonstrate that lightning can interact with the lower ionosphere.
Davis, Chris J, Johnson, Chris G
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The Characteristics and Simulation of Sporadic E Layers in Ascending and Descending Phases of the Solar Cycle at Mid‐Latitude Stations

Journal of Geophysical Research: Space Physics
Most of the attention was paid to the correlation between Sporadic E (Es) layers and solar activity, and conflicting conclusions were obtained in previous research.
Yabin Zhang, Huaiyun Peng, Ruimin Jin, Haiying Li, Yanli Hu, P. Ban, Bin Xu, Tong Xu, Haisheng Zhao, Jiajing Wu, Yaoyu Tian, Shouzhi Xie, Jian Wu   +12 more
semanticscholar   +1 more source

Measurement of Sporadic E-Layer lonization

Nature, 1949
THE usual measure of sporadic E-layer ionization is the so-called 'critical frequency', that is, the highest reflected frequency for this layer. While this definition is suitable for all other ionospheric layers, it is not sufficient for the sporadic E-layer (Es), because it consists of ionized clouds and has no homogeneous ionization.
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Sporadic E layers; history and recent observations

Advances in Space Research, 1990
Sporadic E is itself a stratification within the E-region. The seasonal, diurnal and geographic distributions are not easily explained on the basis of the popular windshear theory. Stratification of mid-latitude sporadic E into 2 or more layers was observed as early as 1956 and preferred heights for sporadic E layers evident from rocket measurements ...
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Reflection of radio waves by sporadic-E layers

Journal of Atmospheric and Terrestrial Physics, 1977
A full-wave analysis of the reflection coefficient is developed and applied to electron-density profiles of midlatitude sporadic-E layers observed by rocket-borne probes. It is shown that partial reflection from the large electron-density gradients at the upper and lower boundaries of sporadic-E layers does not account for the partial transparency ...
K.L. Miller, L.G. Smith
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The seasonal distribution of sporadic E layers observed from radio occultation measurements and its relation with wind shear measured by TIMED/TIDI

Advances in Space Research, 2018
By using the 2002–2016 dataset of COSMIC, CHAMP and GRACE radio occultation (RO) and TIMED/TIDI, we investigate the morphology of global sporadic E (ES) layers and its relation with wind shear.
Yi Liu, Chen Zhou, Qiong Tang, Li Zhengqiang, Song Yang, Haiyin Qing, B. Ni, Zhengyu Zhao   +7 more
semanticscholar   +1 more source

The movements of sporadic-E layer clouds

Journal of Atmospheric and Terrestrial Physics, 1957
Abstract An account is given of some measurements of the magnitude of the drift velocity of isolated sporadic-E clouds, using a C.W. technique. The method involves determining the rate of change of phase path of a wave reflected at almost vertical incidence, by measuring the rate of fading of the received signal due to interference between the ...
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Evidence of Mid- and Low-Latitude Nighttime Ionospheric $E$ – $F$ Coupling: Coordinated Observations of Sporadic $E$ Layers, $F$ -Region Field-Aligned Irregularities, and Medium-Scale Traveling Ionospheric Disturbances

IEEE Transactions on Geoscience and Remote Sensing, 2019
We present the observational evidence of $E$ - and $F$ -region field-aligned irregularities (FAIs), nighttime medium-scale traveling ionospheric disturbances (MSTIDs), and a sporadic $E$ ( $E_{\text {S}}$ )-layer using the Wuhan very-high-frequency ...
Yi Liu, Chen Zhou, Qiong Tang, J. Kong, X. Gu, B. Ni, Yibin Yao, Zhengyu Zhao   +7 more
semanticscholar   +1 more source