Partial Reflections of Radio Waves from the Lower Ionosphere PDF Download
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Author: D. J. Connolly
Publisher:
ISBN:
Category : Ionospheric electron density
Languages : en
Pages : 60
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Book Description
The addition of phase difference measurements to partial reflection experiments is discussed, and some advantages of measuring electron density this way are pointed out. The additional information obtained reduces the requirement for an accurate predetermination of collision frequency. Calculations are also made to estimate the errors expected in partial-reflection experiments due to the assumption of Fresnel reflection and to the neglect of coupling between modes. In both cases, the errors are found to be of the same order as known errors in the measurements due to current instrumental limitations.
Author: D. J. Connolly
Publisher:
ISBN:
Category : Ionospheric electron density
Languages : en
Pages : 60
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Book Description
The addition of phase difference measurements to partial reflection experiments is discussed, and some advantages of measuring electron density this way are pointed out. The additional information obtained reduces the requirement for an accurate predetermination of collision frequency. Calculations are also made to estimate the errors expected in partial-reflection experiments due to the assumption of Fresnel reflection and to the neglect of coupling between modes. In both cases, the errors are found to be of the same order as known errors in the measurements due to current instrumental limitations.
Author: D. J. Connolly
Publisher:
ISBN:
Category :
Languages : en
Pages : 164
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Author: J. S. Belrose
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 332
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Author:
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ISBN:
Category :
Languages : en
Pages : 396
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Contents: Review of Present Knowledge; Partial Reflections--A critical review of the partial reflection experiment, The irregularities responsible for scattering, Observational results, VHF forward scatter Lower ionosphere echoes observed with incoherent scatter radars; Pulse Radio Wave Interaction -- Techniques and methods of analysis, Observational results and miscellaneous aspects of wave interaction.
Author: James R. Wait
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 104
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The principal results of this technical note are graphical presentations of the attenuation rates, phase velocities, and excitation factors for the dominant modes in the earth-ionosphere waveguide.The frequency range considered is 8 kc/s to 30 kc/s. *The model adopted for the ionosphere has an exponential variation for both the electron density and the collision frequency, and the effect of the earth's magnetic field is considered.Comparison with published experimental data confirms that the minimum attenuation of VLF radio waves in daytime is approximtely at 18 kc/s, while at night it is somewhat lower.The directional dependences of propagation predicted by the theory are also confirmed by experimental data.(Author).
Author: Charles Raymond Pirnat
Publisher:
ISBN:
Category : Ionospheric electron density
Languages : en
Pages : 166
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Author: David John Heilbronn
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 338
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Author: J. Ralph Johler
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 206
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Author:
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Category :
Languages : en
Pages :
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Abstract: The paper presents data from some campaigns at Sura heating facility in 2011–1016. The experiments on probing of the artificial disturbed region of the lower ionosphere were carried out at two observation sites. One of them was located near Vasil'sursk 1 km from Sura facility (56.1°N; 46.1°E) and the other site was located at the Observatory (55.85°N; 48.8°E) of Kazan State University, 170 km to the East. Investigation of the features of the disturbed region of the lower ionosphere based on its diagnostics by the methods of the vertical sounding and oblique backscattering is the main goal of this paper. Ionosphere disturbance was fulfilled by the effect of the powerful radio wave of the ordinary or extraordinary polarization emitted by transmitters of the Sura facility with effective radiated power ERP = 50–120 MW at the frequency of 4.3, 4.7 and 5.6 MHz. Pumping waves were emitted with period from 30 s to 15 min. The disturbed region of the ionosphere in Vasil'sursk was probed by the vertical sounding technique using the partial reflexion radar at the frequency of 2.95 and 4.7 MHz. For the oblique sounding of the disturbed region the modified ionosonde Cyclon-M, operating at ten frequencies from 2.01 to 6.51 MHz was used at the Observatory site. On many heating sessions simultaneous variations of the probing partial reflection signals in Vasil'sursk and backscattered signals in Observatory were observed at the height at 40–100 km below the reflection height of the pumping wave. These observations were correlated with the pumping periods of the Sura facility. Possible mechanisms of the appearance of the disturbance in the lower ionosphere and its effect on the probing radio waves are discussed.
Author:
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Category :
Languages : en
Pages : 448
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