Multifrequency Long Wave Vertical Sounding Of The Lower Ionosphere
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Author | : Bodo W. Reinisch |
Publisher | : |
Total Pages | : 20 |
Release | : 1973 |
Genre | : Geomagnetism |
ISBN | : |
Vertical pulse sounding at 30, 60, 180, and 520 kHz at Quabbin Reservoir, MA, USA, reveals diurnal and seasonal variations in structure, reflectivity, and height of the lower ionosphere. A solid state wideband amplifier feeds 10 kW peak power into a ground-laid six-element antenna. A special digital sampling and integration scheme selects median values of amplitude and phase received at perpendicular loop antennas. Day and nighttime D-region model profiles are fitted to the observed data by matching group height and reflection coefficient. Emphasis is placed on the nighttime residual E-layer observed at 100 km with an electron density, under undisturbed conditions, around 1000/cc. Long and short term variability of this layer is considerable. It is often semi-transparent as indicated by simultaneous E- and F-region echoes, suggesting the presence of a valley above the nighttime E-layer. (Author).
Author | : B. W. Reinisch |
Publisher | : |
Total Pages | : 14 |
Release | : 1973 |
Genre | : |
ISBN | : |
Vertical pulse sounding at 30, 60, 180, and 520 kHz at Quabbin Reservoir, MA, USA, reveals diurnal and seasonal variations in structure, reflectivity, and height of the lower ionosphere. A solid state wideband amplifier feeds 10 kW peak power into a ground-laid six-element antenna. A special digital sampling and integration scheme selects median values of amplitude and phase received at perpendicular loop antennas. Day and nighttime D-region model profiles are fitted to the observed data by matching group height and reflection coefficient. Emphasis is placed on the nighttime residual E-layer observed at 100 km with an electron density, under undisturbed conditions, around 1000/cc. Long and short term variability of this layer is considerable. It is often semi-transparent as indicated by simultaneous E- and F-region echoes, suggesting the presence of a valley above the nighttime E-layer. (Author).
Author | : Air Force Cambridge Research Laboratories (U.S.) |
Publisher | : |
Total Pages | : 336 |
Release | : 1972 |
Genre | : Geophysics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 978 |
Release | : 1974-07 |
Genre | : Nuclear energy |
ISBN | : |
Author | : Robert W. Knecht |
Publisher | : |
Total Pages | : 90 |
Release | : 1957 |
Genre | : Ionograms |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 1460 |
Release | : 1991 |
Genre | : Aeronautics |
ISBN | : |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author | : |
Publisher | : |
Total Pages | : 1258 |
Release | : 1973 |
Genre | : Atmosphere, Upper |
ISBN | : |
Author | : Sanford Charles Gladden |
Publisher | : |
Total Pages | : 144 |
Release | : 1959 |
Genre | : Ionosphere |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 908 |
Release | : 1975 |
Genre | : Engineering |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 892 |
Release | : 1974 |
Genre | : Government reports announcements & index |
ISBN | : |