Results 251 to 260 of about 139,585 (296)

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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Rocket Observations of Sporadic‐E Layers

Radio Science, 1972
The characteristics of midlatitude sporadic‐E layers are observed using rocket payloads incorporating a probe and a propagation experiment.Layers below 120 km show evidence of preferred altitudes. The slopes of layers are within 1° of horizontal. The horizontal dimensions are deduced to be several hundred kilometers.
L. G. Smith, E. A. Mechtly
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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 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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Sudden neutral sodium layers: a strong link to sporadic E layers

Journal of Atmospheric and Terrestrial Physics, 1988
Abstract A sodium LIDAR instrument located at Andenes, Norway (69°N; 16°E) observed several sudden developments of narrow sodium layers in the 90–100 km altitude region. These layers grow with typical time constants of 5 min and have a width of 1 km in altitude. We present the temporal and spatial properties for a number of these events.
U. Von Zahn, T.L. Hansen
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20 March 2015 solar eclipse influence on sporadic E layer

Advances in Space Research, 2015
Abstract This paper shows how the solar eclipse occurred on 20 March 2015 influenced the sporadic E (Es) layer as recorded by the Advanced Ionospheric Sounder by Istituto Nazionale di Geofisica e Vulcanologia (AIS-INGV) ionosondes installed at Rome (41.8°N, 12.5°E) and Gibilmanna (37.9°N, 14.0°E), Italy. In these locations, the solar eclipse was only
Pezzopane, M, Pietrella, M., PIGNALBERI, ALESSIO, Tozzi, R.   +3 more
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The formation of the sporadic-E layer

Journal of Atmospheric and Terrestrial Physics, 1964
Abstract It is assumed that sporadic -E is caused by the vertical movement of ionisation to form a layer of enhanced ionisation, the limiting width of such a layer being determined by the effects of diffusion. Thus since the diffusion constant varies markedly with geomagnetic latitude it is predicted that layer formation will be more likely near to ...
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Lunar tidal variations in the equatorial sporadic-E-layer

Journal of Atmospheric and Terrestrial Physics, 1970
Abstract In this paper, noon values of f 0 E s at Kodaikanal are studied to find lunar tidal variations in the equatorial sporadic- E -layer ( E sq type). It is shown that the phases of lunar diurnal and semidiurnal variations in f 0 E s and f b E s are in agreement with those of the H -component of the Earth's magnetic ...
B.K. Joshi, K.M. Kotadia
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A study of the sporadic-E layer over Waltair

Journal of Atmospheric and Terrestrial Physics, 1964
Abstract From the ƒfE s data, manually observed at Waltair, during February 1956 to February 1957 and November 1961 to October 1962, the diurnal and seasonal variation of the occurrence of Es is studied. An attempt is made to explain the obtained results. The diurnal and seasonal variations of ƒE s are studied and the results are
M.Mukunda Rao, B.Ramachandra Rao
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